Initial Commit

CircuitBuffer.cpp

@@ -0,0 +1,96 @@
+#include "CircuitBuffer.h"
+
+#include "Part.h"
+#include "Wire.h"
+#include "Connector.h"
+#include "Scene.h"
+#include "Logic.h"
+
+#include "Parts/IntegratedCircuit.h"
+
+CircuitBuffer::CircuitBuffer()
+{
+
+}
+
+void CircuitBuffer::addFromScene(const QList<Part*> &parts, const QList<Wire*>& wires)
+{
+    // Maps the pointer of every given part to the corresponding pointer to an element in m_parts
+    QMap<Part*, PartData*> partPtrToDataPtr;
+
+    for(auto part : parts)
+    {
+        // Create partData
+        PartData partData;
+        partData.type = part->m_partType;
+        partData.pos = part->pos();
+        if(part->partType() == PartType::IntegratedCircuit)
+            partData.icFilename = ((IntegratedCircuit*)part)->filename();
+        else
+            partData.icFilename = QString();
+        // Add part to parts list
+        m_parts.append(partData);
+        // Make it possible to find partData pointer with Part pointer
+        partPtrToDataPtr.insert(part, &m_parts.last());
+    }
+    for(auto wire : wires)
+    {
+        auto wireInputPart = (Part*)wire->m_connectorInput->parentItem();
+        auto wireOutputPart = (Part*)wire->m_connectorOutput->parentItem();
+
+        // Create wireData
+        WireData wireData;
+        wireData.inputPart = partPtrToDataPtr[wireInputPart];
+        wireData.inputPartConnectorIdx = wireInputPart->m_outputs.indexOf(wire->m_connectorInput);
+        wireData.outputPart = partPtrToDataPtr[wireOutputPart];
+        wireData.outputPartConnectorIdx = wireOutputPart->m_inputs.indexOf(wire->m_connectorOutput);
+        m_wires.append(wireData);
+    }
+}
+
+QPair<QList<Part*>, QList<Wire*>> CircuitBuffer::addIntoScene(Scene* scene, QPointF posOffset) const
+{
+    QList<Part*> allocatedParts;
+    QList<Wire*> allocatedWires;
+
+    QMap<const PartData*, Part*> dataToAllocatedPart;
+
+    for(auto& partData : m_parts)
+    {
+        Part* part;
+        if(partData.type == PartType::IntegratedCircuit)
+            part = scene->m_logic->createIC(partData.icFilename, partData.pos + posOffset);
+        else
+            part = scene->m_logic->createPart(partData.type, partData.pos + posOffset);
+        dataToAllocatedPart.insert(&partData, part);
+
+        allocatedParts.append(part);
+    }
+
+    for(auto& wireData : m_wires)
+    {
+        // input and output are relative to the wire
+        Part* inputPart = dataToAllocatedPart[wireData.inputPart];
+        Connector* inputConnector = inputPart->m_outputs[wireData.inputPartConnectorIdx];
+        Part* outputPart = dataToAllocatedPart[wireData.outputPart];
+        Connector* outputConnector = outputPart->m_inputs[wireData.outputPartConnectorIdx];
+        Wire* wire = scene->m_logic->createWire(inputConnector, outputConnector);
+
+        allocatedWires.append(wire);
+    }
+    return QPair<QList<Part*>, QList<Wire*>>(allocatedParts, allocatedWires);
+}
+
+QPointF CircuitBuffer::getAvgPartPos()
+{
+    QPointF sum(0.f, 0.f);
+    for(auto part : m_parts)
+        sum += part.pos;
+    return sum / m_parts.length();
+}
+
+void CircuitBuffer::clear()
+{
+    m_parts.clear();
+    m_wires.clear();
+}

CircuitBuffer.h

@@ -0,0 +1,44 @@
+#ifndef CIRCUITBUFFER_H
+#define CIRCUITBUFFER_H
+
+class Part;
+class Wire;
+class Scene;
+
+#include <QList>
+#include <QPointF>
+
+#include "ePartType.h"
+
+class CircuitBuffer
+{
+public:
+    struct PartData
+    {
+        PartType::PartType type;
+        QPointF pos;
+        QString icFilename;
+    };
+
+    struct WireData
+    {
+        PartData* inputPart;
+        int inputPartConnectorIdx;
+        PartData* outputPart;
+        int outputPartConnectorIdx;
+    };
+
+    CircuitBuffer();
+
+    void addFromScene(const QList<Part*>& parts, const QList<Wire*>& wires);
+    QPair<QList<Part*>, QList<Wire*>> addIntoScene(Scene* scene, QPointF posOffset) const;
+    QPointF getAvgPartPos();
+
+    void clear();
+
+private:
+    QList<PartData> m_parts;
+    QList<WireData> m_wires;
+};
+
+#endif // CIRCUITBUFFER_H

CircuitSimulator.pro

@@ -0,0 +1,88 @@
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++11
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    CircuitBuffer.cpp \
+    Logic.cpp \
+    Parts/AndGate.cpp \
+    Parts/BufferGate.cpp \
+    Parts/HighConstant.cpp \
+    Parts/IntegratedCircuit.cpp \
+    Parts/LightBulb.cpp \
+    Parts/LowConstant.cpp \
+    Parts/NandGate.cpp \
+    Parts/NorGate.cpp \
+    Parts/NotGate.cpp \
+    Parts/OrGate.cpp \
+    Parts/ToggleButton.cpp \
+    Parts/XnorGate.cpp \
+    Parts/XorGate.cpp \
+    Connector.cpp \
+    FileHandler.cpp \
+    MainWindow.cpp \
+    Part.cpp \
+    Scene.cpp \
+    UndoCommands/AddPart.cpp \
+    UndoCommands/AddWire.cpp \
+    UndoCommands/CopyParts.cpp \
+    UndoCommands/MoveParts.cpp \
+    UndoCommands/RemoveParts.cpp \
+    UndoCommands/RemoveWire.cpp \
+    Wire.cpp \
+    main.cpp
+
+HEADERS += \
+    CircuitBuffer.h \
+    Logic.h \
+    Parts/AndGate.h \
+    Parts/BufferGate.h \
+    Parts/HighConstant.h \
+    Parts/IntegratedCircuit.h \
+    Parts/LightBulb.h \
+    Parts/LowConstant.h \
+    Parts/NandGate.h \
+    Parts/NorGate.h \
+    Parts/NotGate.h \
+    Parts/OrGate.h \
+    Parts/ToggleButton.h \
+    Parts/XnorGate.h \
+    Parts/XorGate.h \
+    Connector.h \
+    FileHandler.h \
+    MainWindow.h \
+    Part.h \
+    Scene.h \
+    UndoCommands/AddPart.h \
+    UndoCommands/AddWire.h \
+    UndoCommands/CopyParts.h \
+    UndoCommands/MoveParts.h \
+    UndoCommands/RemoveParts.h \
+    UndoCommands/RemoveWire.h \
+    Wire.h \
+    eConnectorType.h \
+    ePartType.h
+
+FORMS += \
+    MainWindow.ui
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
+
+RESOURCES += \
+    Resources.qrc

Connector.cpp

@@ -0,0 +1,99 @@
+#include "Connector.h"
+
+#include <QPainter>
+#include "Part.h"
+#include "MainWindow.h"
+#include "Wire.h"
+#include "eConnectorType.h"
+#include "Scene.h"
+
+
+// PUBLIC
+Connector::Connector(Scene* scene, Part *parentPart, ConnectorType::ConnectorType side)
+    :m_scene(scene), m_connectorType(side)
+{
+    setParentItem(parentPart);
+
+    setFlag(QGraphicsItem::ItemSendsScenePositionChanges);
+}
+
+QRectF Connector::boundingRect() const
+{
+    if(m_connectorType == ConnectorType::Output)
+        return QRectF(-1, -4, 15, 8);
+    else
+        return QRectF(-14, -4, 15, 8);
+}
+
+QPainterPath Connector::shape() const
+{
+    QPainterPath path;
+    if(m_connectorType == ConnectorType::Output)
+        path.addRect(-1, -4, 15, 8);
+    else
+        path.addRect(-14, -4, 15, 8);
+    return path;
+}
+
+void Connector::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    QPen pen = painter->pen();
+    pen.setWidth(2);
+    if(parentItem()->isSelected())
+        pen.setColor(((Part*)parentItem())->m_penColorSelected);
+    else
+        pen.setColor(((Part*)parentItem())->m_penColorNormal);
+    painter->setPen(pen);
+    QBrush brush = painter->brush();
+    if(m_selected)
+    {
+        brush.setStyle(Qt::BrushStyle::SolidPattern);
+        brush.setColor(Qt::green);
+    }
+    painter->setBrush(brush);
+    if(m_connectorType == ConnectorType::Output)
+    {
+        painter->drawLine(2, 0, 6, 0);
+        painter->drawEllipse(7, -3, 6, 6);
+    }
+    else
+    {
+        painter->drawLine(-6, 0, -2, 0);
+        painter->drawEllipse(-13, -3, 6, 6);
+    }
+}
+
+void Connector::mousePressEvent(QGraphicsSceneMouseEvent *event)
+{
+    m_scene->connectorClicked(this);
+}
+
+QVariant Connector::itemChange(GraphicsItemChange change, const QVariant &value)
+{
+    if(change == ItemScenePositionHasChanged)
+    {
+        // Update wires
+        for(auto i : m_wires)
+            i->updateLine();
+    }
+
+    return value;
+}
+
+ConnectorType::ConnectorType Connector::connectorType()
+{
+    return m_connectorType;
+}
+
+// PRIVATE
+void Connector::select()
+{
+    m_selected = true;
+    update();
+}
+
+void Connector::unselect()
+{
+    m_selected = false;
+    update();
+}

Connector.h

@@ -0,0 +1,47 @@
+#ifndef CIRCUITCONNECTION_H
+#define CIRCUITCONNECTION_H
+
+#include <QGraphicsItem>
+#include <QList>
+#include "eConnectorType.h"
+
+class Part;
+class Wire;
+class Scene;
+
+class Connector : public QGraphicsItem
+{
+public:
+    friend class Scene;
+    friend class Logic;
+    friend class Part;
+    friend class Wire;
+    friend class AddPart;
+    friend class RemoveParts;
+    friend class CopyParts;
+
+    friend class MainWindow;
+
+    Connector(Scene* scene, Part *parentPart, ConnectorType::ConnectorType side);
+
+    QRectF boundingRect() const override; // For drawing
+    QPainterPath shape() const override; // For selection ("Hitbox")
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
+    void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
+    QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
+
+    ConnectorType::ConnectorType connectorType();
+
+private:
+    Scene* m_scene;
+
+    QList<Wire*> m_wires;
+    ConnectorType::ConnectorType m_connectorType;
+    bool m_state = false;
+    bool m_selected = false; // Separate from regular selection, for creating connections
+
+    void select(); // Called by MainWindow
+    void unselect(); // Called by MainWindow
+};
+
+#endif // CIRCUITCONNECTION_H

FileHandler.cpp

@@ -0,0 +1,139 @@
+#include "FileHandler.h"
+
+#include <QFileInfo>
+#include <QTextStream>
+#include <QFile>
+#include <QDir>
+#include "Scene.h"
+#include "Part.h"
+#include "Wire.h"
+#include "Connector.h"
+#include "Logic.h"
+#include "MainWindow.h"
+
+#include "Parts/IntegratedCircuit.h"
+
+#include <QDebug>
+
+FileHandler::FileHandler(Logic* logic)
+    :m_logic(logic)
+{
+}
+
+bool FileHandler::exists(QString filename)
+{
+    QFile file(filename);
+    return file.exists();
+}
+
+bool FileHandler::save(QString filename)
+{
+    QFile file(filename);
+
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
+        return false;
+
+    QTextStream fOut(&file);
+
+    fOut << "[parts]\n";
+    for(auto part : m_logic->m_parts)
+    {
+        fOut << part << " " << part->m_partType << " " << part->pos().x() << " " << part->pos().y();
+        if(part->m_partType == PartType::IntegratedCircuit)
+        {
+            // Strip out IC file path
+            QFileInfo fileInfo(((IntegratedCircuit*)part)->filename());
+            QString icFile(fileInfo.fileName());
+            fOut << " " << icFile;
+        }
+        fOut << "\n";
+    }
+
+    fOut << "[wires]\n";
+    for(auto wire : m_logic->m_wires)
+    {
+        auto wireInputPart = (Part*)wire->m_connectorInput->parentItem();
+        auto wireOutputPart = (Part*)wire->m_connectorOutput->parentItem();
+
+        fOut << wireInputPart << " " << wireInputPart->m_outputs.indexOf(wire->m_connectorInput) << " " << wireOutputPart << " " << wireOutputPart->m_inputs.indexOf(wire->m_connectorOutput) << "\n";
+    }
+    return true;
+}
+
+bool FileHandler::open(QString filename)
+{
+    //TODO: Make it possible to load IC filenames with spaces
+
+    QFile file(filename);
+
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
+        return false;
+
+    enum Sector
+    {
+        Parts,
+        Wires
+    };
+
+    Sector currentSector;
+
+    // A .csim file stores all parts with IDs, this map simply keeps track of which ID was given which pointer
+    QMap<QString, Part*> idPartPointerMap;
+
+    while (!file.atEnd()) {
+        QString line = file.readLine();
+        if(line.contains("[parts]"))
+            currentSector = Parts;
+        else if(line.contains("[wires]"))
+            currentSector = Wires;
+        else
+        {
+            QVector<QString> words;
+            QString currWord;
+            for(QChar c : line)
+            {
+                if(c == QChar::Space)
+                {
+                    words.append(currWord);
+                    currWord.clear();
+                }
+                else
+                    currWord.append(c);
+            }
+            words.append(currWord);
+            // Remove the \n from last word
+            words.last().remove(words.last().length() - 1, 1);
+
+            if(words.length() < 4)
+                return false;
+
+            if(currentSector == Parts)
+            {
+                PartType::PartType type = (PartType::PartType)words[1].toInt();
+                QPointF pos = QPointF(words[2].toFloat(), words[3].toFloat());
+                Part* part;
+                if(type == PartType::IntegratedCircuit)
+                {
+                    QDir icDir(filename);
+                    icDir.cdUp();
+                    QString icFilename = icDir.filePath(words[4]);
+                    if(!QFile(icFilename).exists())
+                    {
+                        qFatal("Failed to open IC file: " + icFilename.toUtf8());
+                    }
+                    part = m_logic->createIC(icFilename, pos);
+                }
+                else
+                    part = m_logic->createPart(type, pos);
+                idPartPointerMap.insert(words[0], part);
+            }
+            else
+            {
+                auto inputConnector = idPartPointerMap[words[0]]->m_outputs[words[1].toInt()];
+                auto outputConnector = idPartPointerMap[words[2]]->m_inputs[words[3].toInt()];
+                m_logic->createWire(inputConnector, outputConnector);
+            }
+        }
+    }
+    return true;
+}

FileHandler.h

@@ -0,0 +1,21 @@
+#ifndef FILEHANDLER_H
+#define FILEHANDLER_H
+
+#include <QString>
+
+class Logic;
+
+class FileHandler
+{
+public:
+    FileHandler(Logic* logic);
+
+    bool exists(QString filename);
+    bool save(QString filename);
+    bool open(QString filename);
+
+private:
+    Logic* m_logic;
+};
+
+#endif // FILEHANDLER_H

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
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+
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+you modify it: responsibilities to respect the freedom of others.
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Logic.cpp

@@ -0,0 +1,178 @@
+#include "Logic.h"
+
+#include <QFileDialog>
+
+#include "eConnectorType.h"
+#include "Part.h"
+#include "Connector.h"
+#include "Wire.h"
+#include "FileHandler.h"
+#include "Scene.h"
+#include "MainWindow.h"
+
+#include "Parts/BufferGate.h"
+#include "Parts/NotGate.h"
+#include "Parts/AndGate.h"
+#include "Parts/OrGate.h"
+#include "Parts/NandGate.h"
+#include "Parts/NorGate.h"
+#include "Parts/XorGate.h"
+#include "Parts/XnorGate.h"
+#include "Parts/HighConstant.h"
+#include "Parts/LowConstant.h"
+#include "Parts/LightBulb.h"
+#include "Parts/ToggleButton.h"
+#include "Parts/IntegratedCircuit.h"
+
+Logic::Logic(Scene* parentScene)
+    :m_parentScene(parentScene)
+{
+
+}
+
+Scene* Logic::parentScene()
+{
+    return m_parentScene;
+}
+
+void Logic::doLogicStep()
+{
+    // The method of first updating the items, then the connections makes everything happen completely
+    // synchronously and makes sure that a signal isn't propagated or computed twice in a single step
+
+    // Let the circuitItems compute everything
+    for(auto part : m_parts)
+    {
+        part->updateState();
+    }
+    // Reset the state of any connector receiving input before each step
+    for(auto connector : m_inputConnectors)
+    {
+        connector->m_state = false;
+    }
+    // Make wires propagate forward their input
+    for(auto wire : m_wires)
+    {
+        wire->feedInput();
+    }
+}
+
+bool Logic::saveToFile(QString filename)
+{
+    if(m_parentScene)
+        m_parentScene->m_parentMainWindow->changesSaved();
+    FileHandler fh(this);
+    return fh.save(filename);
+}
+
+bool Logic::loadFromFile(QString filename)
+{
+    FileHandler fh(this);
+    return fh.open(filename);
+}
+
+// PRIVATE
+IntegratedCircuit* Logic::createIC(QString filename, QPointF pos)
+{
+    IntegratedCircuit* ic = new IntegratedCircuit(this, filename);
+    if(m_parentScene)
+        m_parentScene->addItem(ic);
+    m_parts.append(ic);
+    ic->setPos(pos);
+    ic->m_oldPos = pos;
+    ic->m_partType = PartType::IntegratedCircuit;
+    return ic;
+}
+
+Part* Logic::createPart(PartType::PartType partType, QPointF pos)
+{
+    Part *part;
+
+    if(partType == PartType::GateBuffer)
+        part = new BufferGate(this);
+    else if(partType == PartType::GateNot)
+        part = new NotGate(this);
+    else if(partType == PartType::GateAnd)
+        part = new AndGate(this);
+    else if(partType == PartType::GateOr)
+        part = new OrGate(this);
+    else if(partType == PartType::GateNand)
+        part = new NandGate(this);
+    else if(partType == PartType::GateNor)
+        part = new NorGate(this);
+    else if(partType == PartType::GateXor)
+        part = new XorGate(this);
+    else if(partType == PartType::GateXnor)
+        part = new XnorGate(this);
+    else if(partType == PartType::IOHighConstant)
+        part = new HighConstant(this);
+    else if(partType == PartType::IOLowConstant)
+        part = new LowConstant(this);
+    else if(partType == PartType::IOLightBulb)
+        part = new LightBulb(this);
+    else if(partType == PartType::IOToggleButton)
+        part = new ToggleButton(this);
+
+    if(m_parentScene)
+        m_parentScene->addItem(part);
+    m_parts.append(part);
+    part->setPos(pos);
+    part->m_oldPos = pos;
+    part->m_partType = partType;
+
+    return part;
+}
+
+Wire* Logic::createWire(Connector *inputConnector, Connector *outputConnector)
+{
+    Wire* wire = new Wire(m_parentScene, inputConnector, outputConnector);
+    for(auto w : inputConnector->m_wires)
+    {
+        // If the connection already exists, don't add it and return nullptr
+        if((inputConnector->m_connectorType == ConnectorType::Input && w->m_connectorInput == outputConnector) ||
+            (inputConnector->m_connectorType == ConnectorType::Output && w->m_connectorOutput == outputConnector))
+        {
+            return nullptr;
+        }
+    }
+    // Append wire to connector wire arrays
+    inputConnector->m_wires.append(wire);
+    outputConnector->m_wires.append(wire);
+    // Add wire to scene
+    if(m_parentScene)
+        m_parentScene->addItem(wire);
+    // Add wire to scene's tracker list
+    m_wires.append(wire);
+
+    return wire;
+}
+
+void Logic::deletePart(Part* part)
+{
+    // Remove all of the part's connections first
+    for(auto input : part->m_inputs)
+    {
+        for(auto wire : input->m_wires)
+            deleteWire(wire);
+    }
+    for(auto output : part->m_outputs)
+    {
+        for(auto wire : output->m_wires)
+            deleteWire(wire);
+    }
+    // Remove part out of Logic's tracking list
+    m_parts.removeOne(part);
+    // Deallocate part
+    delete part;
+}
+
+void Logic::deleteWire(Wire *wire)
+{
+    // Remove wire out of Logic's tracking list
+    m_wires.removeOne(wire);
+    // Remove wire out of connectors
+    wire->m_connectorInput->m_wires.removeOne(wire);
+    wire->m_connectorOutput->m_wires.removeOne(wire);
+    // Deallocate wire
+    delete wire;
+}

Logic.h

@@ -0,0 +1,66 @@
+#ifndef LOGIC_H
+#define LOGIC_H
+
+// This class has everything nescessary to load, save and step through a circuit.
+// It does not handle anything graphical or related to undo/redo functionality
+
+#include <QList>
+#include <QPointF>
+#include "ePartType.h"
+
+class Part;
+class Wire;
+class Connector;
+class Scene;
+class IntegratedCircuit;
+
+class Logic
+{
+public:
+    friend class Scene;
+    friend class FileHandler;
+    friend class Part;
+
+    friend class AddPart;
+    friend class RemoveParts;
+    friend class AddWire;
+    friend class RemoveWire;
+    friend class CopyParts;
+
+    friend class CircuitBuffer;
+
+    friend class IntegratedCircuit;
+
+    Logic(Scene* parentScene = nullptr);
+
+    Scene* parentScene();
+
+    void doLogicStep();
+
+    bool saveToFile(QString filenname);
+    bool loadFromFile(QString filenname);
+
+    // Not undoable
+    IntegratedCircuit* createIC(QString filename, QPointF pos);
+    // Not undoable
+    Part* createPart(PartType::PartType partType, QPointF pos);
+    // Not undoable
+    Wire* createWire(Connector *inputConnector, Connector *outputConnector);
+
+    // Not undoable
+    void deletePart(Part* part);
+    // Not undoable
+    void deleteWire(Wire *wire);
+
+private:
+    // May be nullptr if there is no parent Scene and this class is purely used for logic
+    Scene* m_parentScene;
+
+    QList<Part*> m_parts;
+    QList<Wire*> m_wires;
+    QList<Connector*> m_inputConnectors;
+    QList<Connector*> m_outputConnectors;
+
+};
+
+#endif // LOGIC_H

MainWindow.cpp

@@ -0,0 +1,512 @@
+#include "MainWindow.h"
+#include "ui_MainWindow.h"
+
+#include <QGraphicsRectItem>
+#include <QtMath>
+#include <QScrollBar>
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QTimer>
+#include <QCloseEvent>
+#include <QDir>
+
+#include "Connector.h"
+#include "Connector.h"
+#include "Wire.h"
+#include "Part.h"
+#include "Scene.h"
+#include "Logic.h"
+
+#include "UndoCommands/CopyParts.h"
+
+MainWindow::MainWindow(QWidget *parent, QString loadFile)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+{
+    // Setup UI
+    ui->setupUi(this);
+    // Add tab widget to tool bar to make it moveable and floatable
+    // TODO: Use a less hacky solution and make it work horizontally as well
+    ui->toolBarBottom->addWidget(ui->tabWidget);
+    // Set title name
+    m_title = "Circuit Simulator";
+    // Set initial window title
+    setWindowTitle(m_title + " - Unsaved Circuit");
+    // Initialize graphics scene
+    m_scene = new Scene(ui->graphicsView, this);
+    if(!loadFile.isEmpty())
+    {
+        m_currFilename = loadFile;
+        m_fileLoaded = true;
+        if(!m_scene->m_logic->loadFromFile(loadFile))
+        {
+            m_fileLoaded = false;
+        }
+        else
+            setWindowTitle(m_title + " - " + QFileInfo(m_currFilename).fileName());
+    }
+    // Set active tool mode to select
+    toolSelect();
+    // Set active mode to sim started
+    simStart();
+    // Assign scene to graphics view and show it
+    ui->graphicsView->setScene(m_scene);
+    ui->graphicsView->show();
+    // Setup undoView
+    undoView = new QUndoView(m_scene->m_undoStack);
+    undoView->setWindowTitle("Undo View");
+    undoView->setAttribute(Qt::WA_QuitOnClose, false);
+    // Setup graphics timer
+    QTimer *gfxTimer = new QTimer(this);
+    connect(gfxTimer, &QTimer::timeout, this, &MainWindow::onGfxTimerTimeout);
+    gfxTimer->start(17);
+    // Setup logic timer
+    QTimer *logicTimer = new QTimer(this);
+    connect(logicTimer, &QTimer::timeout, this, &MainWindow::onLogicTimerTimeout);
+    logicTimer->start(1);
+    // Refresh IC list
+    reloadLocalICs();
+    //CONNECT EVENTS
+    connect(ui->zoomSlider, &QSlider::valueChanged, this, &MainWindow::updateMatrix);
+
+    connect(ui->btnZoomIn, &QToolButton::clicked, this, &MainWindow::zoomIn);
+    connect(ui->btnZoomOut, &QToolButton::clicked, this, &MainWindow::zoomOut);
+
+    connect(ui->actionZoom_In, &QAction::triggered, this, &MainWindow::zoomIn);
+    connect(ui->actionZoom_Out, &QAction::triggered, this, &MainWindow::zoomOut);
+    connect(ui->actionReset_Zoom, &QAction::triggered, this, &MainWindow::resetZoom);
+
+    connect(ui->actionToggle_Undo_View, &QAction::triggered, this, &MainWindow::toggleUndoView);
+
+    connect(ui->actionUndo, &QAction::triggered, this, &MainWindow::editUndo);
+    connect(ui->actionRedo, &QAction::triggered, this, &MainWindow::editRedo);
+    connect(ui->actionCut, &QAction::triggered, this, &MainWindow::editCut);
+    connect(ui->actionCopy, &QAction::triggered, this, &MainWindow::editCopy);
+    connect(ui->actionPaste, &QAction::triggered, this, &MainWindow::editPaste);
+    connect(ui->actionDelete, &QAction::triggered, this, &MainWindow::editDelete);
+
+    connect(ui->actionNew, &QAction::triggered, this, &MainWindow::fileNew);
+    connect(ui->actionOpen, &QAction::triggered, this, &MainWindow::fileOpen);
+    connect(ui->actionSave, &QAction::triggered, this, &MainWindow::fileSave);
+    connect(ui->actionSave_As, &QAction::triggered, this, &MainWindow::fileSaveAs);
+    connect(ui->actionExit, &QAction::triggered, this, &MainWindow::fileExit);
+
+    connect(ui->actionConnect, &QAction::triggered, this, &MainWindow::toolConnect);
+    connect(ui->actionRemove_Connections, &QAction::triggered, this, &MainWindow::toolDisconnect);
+    connect(ui->actionSelect, &QAction::triggered, this, &MainWindow::toolSelect);
+    connect(ui->actionPan, &QAction::triggered, this, &MainWindow::toolPan);
+
+    connect(ui->actionStep, &QAction::triggered, this, &MainWindow::simStep);
+    connect(ui->actionStart, &QAction::triggered, this, &MainWindow::simStart);
+    connect(ui->actionStop, &QAction::triggered, this, &MainWindow::simStop);
+
+    connect(ui->btnGateBuffer, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnGateNot, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnGateAnd, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnGateOr, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnGateNand, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnGateNor, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnGateXor, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnGateXnor, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+
+    connect(ui->btnIOHighConstant, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnIOLowConstant, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnIOLightBulb, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    connect(ui->btnIOToggleButton, &QToolButton::clicked, this, &MainWindow::toolAddComponent);
+    //END CONNECT EVENTS
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+bool MainWindow::isFileLoaded()
+{
+    return m_fileLoaded;
+}
+
+QString MainWindow::currFilename()
+{
+    return m_currFilename;
+}
+
+//PUBLIC
+
+void MainWindow::resetTools()
+{
+    // Reset button checked states
+    ui->actionConnect->setChecked(false);
+    ui->actionRemove_Connections->setChecked(false);
+    ui->actionSelect->setChecked(false);
+    ui->actionPan->setChecked(false);
+    // Reset drag mode
+    ui->graphicsView->setDragMode(QGraphicsView::NoDrag);
+    // Unselect selected items
+    for(auto item : m_scene->selectedItems())
+        item->setSelected(false);
+    // Reset graphicsView interactivity
+    ui->graphicsView->setInteractive(true);
+    //Reset cursor shape
+    ui->graphicsView->setCursor(QCursor(Qt::CursorShape::ArrowCursor));
+}
+
+void MainWindow::changeMade()
+{
+    unsavedChanges = true;
+    if(m_fileLoaded)
+        setWindowTitle(m_title + " - " + QFileInfo(m_currFilename).fileName() + "*");
+    else
+        setWindowTitle(m_title + " - Unsaved Circuit*");
+}
+
+void MainWindow::changesSaved()
+{
+    unsavedChanges = false;
+    setWindowTitle(m_title + " - " + QFileInfo(m_currFilename).fileName());
+}
+
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+    if(!unsavedChanges)
+    {
+        event->accept();
+        return;
+    }
+
+    // I just blatantly ripped off the following code from this example https://doc.qt.io/qt-5/qmessagebox.html
+    QMessageBox msgBox;
+    msgBox.setText("The Circuit has unsaved changes.");
+    msgBox.setInformativeText("Do you really want to quit?");
+    msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
+    msgBox.setDefaultButton(QMessageBox::Save);
+    int ret = msgBox.exec();
+
+    switch (ret)
+    {
+        case QMessageBox::Save:
+            fileSave();
+            if(!unsavedChanges)
+                event->accept();
+            event->ignore();
+            break;
+        case QMessageBox::Discard:
+            event->accept();
+            break;
+        case QMessageBox::Cancel:
+            event->ignore();
+            break;
+    }
+}
+
+void MainWindow::reloadLocalICs()
+{
+    // Return if no file is loaded
+    if(!m_fileLoaded)
+        return;
+
+    if(tabICInfoLabelExists)
+    {
+        delete ui->tabICInfoLabel;
+        tabICInfoLabelExists = false;
+    }
+
+    for(auto btn : m_icPushButtons)
+    {
+        delete btn;
+    }
+    m_icPushButtons.clear();
+
+    QDir fileDir(m_currFilename);
+    fileDir.cdUp();
+    QStringList nameFilter("*.csim");
+    QStringList icFiles = fileDir.entryList(nameFilter, QDir::Files);
+
+    for(const auto& icFile : icFiles)
+    {
+        // Skip step if file name is equal to currently loaded file
+        if(icFile == QFileInfo(m_currFilename).fileName())
+            continue;
+
+        QPushButton* btn = new QPushButton(ui->tabICScrollAreaWidgetContents);
+
+        ui->tabICScrollAreaWidgetContents->layout()->addWidget(btn);
+        btn->setText(icFile);
+        btn->setObjectName(icFile);
+        btn->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);
+        m_icPushButtons.append(btn);
+
+        connect(btn, &QPushButton::clicked, this, &MainWindow::toolAddIC);
+    }
+}
+
+//SIGNALS
+void MainWindow::updateMatrix()
+{
+    qreal scale = qPow(qreal(2), qreal(ui->zoomSlider->value() - 100) / qreal(20));
+
+    ui->labelZoomLevel->setText(QString::number(int(scale * 100.0)) + '%');
+
+    QMatrix matrix;
+    matrix.scale(scale, scale);
+    ui->graphicsView->setMatrix(matrix);
+}
+
+void MainWindow::zoomIn()
+{
+    ui->zoomSlider->setValue(ui->zoomSlider->value() + ui->zoomSlider->pageStep());
+}
+
+void MainWindow::zoomOut()
+{
+    ui->zoomSlider->setValue(ui->zoomSlider->value() - ui->zoomSlider->pageStep());
+}
+
+void MainWindow::resetZoom()
+{
+    ui->zoomSlider->setValue(100);
+}
+
+void MainWindow::toggleUndoView()
+{
+    if(undoView->isHidden())
+        undoView->show();
+    else
+        undoView->hide();
+}
+
+void MainWindow::editUndo()
+{
+    m_scene->undo();
+}
+
+void MainWindow::editRedo()
+{
+    m_scene->redo();
+}
+
+void MainWindow::editCut()
+{
+    // Put parts into copy buffer
+    editCopy();
+    // Remove selected parts
+    QList<QGraphicsItem*> selItems = m_scene->selectedItems();
+    QList<Part*> selParts;
+    for(auto convItm : selItems)
+        selParts.append((Part*)convItm);
+    m_scene->removeParts(selParts);
+}
+
+void MainWindow::editCopy()
+{
+    QList<QGraphicsItem*> selItems = m_scene->selectedItems();
+    QSet<Part*> selParts;
+    QList<Part*> selPartsList;
+    QList<Wire*> selPartsWires;
+
+    for(auto item : selItems)
+        selParts.insert((Part*)item);
+
+    selPartsList = selParts.values();
+
+    // Problem: find all wires of which both sides are being used by selected parts
+    // Go through all selected parts
+    for(auto part : selPartsList)
+    {
+        // Go through their outgoing connectors
+        for(auto outConnector : part->m_outputs)
+        {
+            // Go through their wires
+            for(auto outWire : outConnector->m_wires)
+            {
+                // See if the other end of the wire contains a part which is also selected
+                if(selParts.contains((Part*)outWire->m_connectorOutput->parentItem()))
+                        selPartsWires.append(outWire);
+            }
+        }
+    }
+
+    m_scene->initCopy(selPartsList, selPartsWires);
+}
+
+void MainWindow::editPaste()
+{
+    // Only do copy relative to mouse if graphicsView under mouse
+    // Else, copy into center of graphics view
+    m_scene->doCopy(ui->graphicsView->underMouse());
+}
+
+void MainWindow::editDelete()
+{
+    QList<QGraphicsItem*> selItems = m_scene->selectedItems();
+    QList<Part*> selParts;
+    for(auto convItm : selItems)
+        selParts.append((Part*)convItm);
+    m_scene->removeParts(selParts);
+}
+
+void MainWindow::fileNew()
+{
+    MainWindow* newWindow = new MainWindow();
+    newWindow->show();
+}
+
+void MainWindow::fileOpen()
+{
+    QString filter = tr("CSIM Files(*.csim)");
+    auto filename = QFileDialog::getOpenFileName(this, tr("Open File"), "", filter, &filter);
+    if(!filename.isEmpty())
+    {
+        // If there is already a file loaded or there are unsaved changes, create a new window
+        if(m_fileLoaded || unsavedChanges)
+        {
+            MainWindow* newWindow = new MainWindow(nullptr, filename);
+            newWindow->show();
+        }
+        // Else, load file into current window
+        else
+        {
+            if(m_scene->m_logic->loadFromFile(filename))
+            {
+                m_currFilename = filename;
+                m_fileLoaded = true;
+                setWindowTitle(m_title + " - " + QFileInfo(m_currFilename).fileName());
+            }
+        }
+    }
+    reloadLocalICs();
+}
+
+void MainWindow::fileSave()
+{
+    if(m_fileLoaded)
+        m_scene->m_logic->saveToFile(m_currFilename);
+    else
+        fileSaveAs();
+    reloadLocalICs();
+}
+
+void MainWindow::fileSaveAs()
+{
+    QString filter = tr("CSIM Files(*.csim)");
+    auto filename = QFileDialog::getSaveFileName(this, tr("Save As"), "", filter, &filter);
+    if(!filename.isEmpty())
+    {
+        if(m_scene->m_logic->saveToFile(filename))
+        {
+            m_fileLoaded = true;
+            m_currFilename = filename;
+            setWindowTitle("Circuit Simulator - " + QFileInfo(m_currFilename).fileName());
+        }
+    }
+    reloadLocalICs();
+}
+
+void MainWindow::fileExit()
+{
+    this->close();
+}
+
+void MainWindow::toolConnect()
+{
+    resetTools();
+    toolMode = Connect;
+    ui->actionConnect->setChecked(true);
+    ui->graphicsView->setCursor(QCursor(Qt::CursorShape::PointingHandCursor));
+}
+
+void MainWindow::toolDisconnect()
+{
+    resetTools();
+    toolMode = Disconnect;
+    ui->actionRemove_Connections->setChecked(true);
+    ui->graphicsView->setCursor(QCursor(Qt::CursorShape::PointingHandCursor));
+}
+
+void MainWindow::toolSelect()
+{
+    resetTools();
+    toolMode = Select;
+    ui->graphicsView->setDragMode(QGraphicsView::RubberBandDrag);
+    ui->actionSelect->setChecked(true);
+}
+
+void MainWindow::toolPan()
+{
+    resetTools();
+    toolMode = Pan;
+    ui->graphicsView->setDragMode(QGraphicsView::ScrollHandDrag);
+    ui->graphicsView->setInteractive(false);
+    ui->actionPan->setChecked(true);
+}
+
+void MainWindow::toolAddComponent()
+{
+    QToolButton *button = (QToolButton*)sender();
+
+    if(button->objectName() == "btnGateBuffer")
+        m_scene->addPart(PartType::GateBuffer);
+    else if(button->objectName() == "btnGateNot")
+        m_scene->addPart(PartType::GateNot);
+    else if(button->objectName() == "btnGateAnd")
+        m_scene->addPart(PartType::GateAnd);
+    else if(button->objectName() == "btnGateOr")
+        m_scene->addPart(PartType::GateOr);
+    else if(button->objectName() == "btnGateNand")
+        m_scene->addPart(PartType::GateNand);
+    else if(button->objectName() == "btnGateNor")
+        m_scene->addPart(PartType::GateNor);
+    else if(button->objectName() == "btnGateXor")
+        m_scene->addPart(PartType::GateXor);
+    else if(button->objectName() == "btnGateXnor")
+        m_scene->addPart(PartType::GateXnor);
+    else if(button->objectName() == "btnIOHighConstant")
+        m_scene->addPart(PartType::IOHighConstant);
+    else if(button->objectName() == "btnIOLowConstant")
+        m_scene->addPart(PartType::IOLowConstant);
+    else if(button->objectName() == "btnIOLightBulb")
+        m_scene->addPart(PartType::IOLightBulb);
+    else if(button->objectName() == "btnIOToggleButton")
+        m_scene->addPart(PartType::IOToggleButton);
+}
+
+void MainWindow::simStep()
+{
+    m_scene->m_logic->doLogicStep();
+}
+
+void MainWindow::simStart()
+{
+    ui->actionStart->setEnabled(false);
+    ui->actionStep->setEnabled(false);
+    ui->actionStop->setEnabled(true);
+    simRunning = true;
+}
+
+void MainWindow::simStop()
+{
+    ui->actionStart->setEnabled(true);
+    ui->actionStep->setEnabled(true);
+    ui->actionStop->setEnabled(false);
+    simRunning = false;
+}
+
+void MainWindow::onLogicTimerTimeout()
+{
+    if(simRunning)
+        m_scene->m_logic->doLogicStep();
+}
+
+void MainWindow::onGfxTimerTimeout()
+{
+    m_scene->updateGraphics();
+}
+
+void MainWindow::toolAddIC()
+{
+    QDir fileDir(m_currFilename);
+    fileDir.cdUp();
+    QString path = fileDir.absoluteFilePath(sender()->objectName());
+    m_scene->addIC(path);
+}
+//END SIGNALS

MainWindow.h

@@ -0,0 +1,113 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QGraphicsScene>
+#include <QToolButton>
+#include <QUndoStack>
+#include <QUndoView>
+#include <QPushButton>
+#include "eConnectorType.h"
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class MainWindow; }
+QT_END_NAMESPACE
+
+class Connector;
+class Part;
+class Wire;
+class Scene;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    friend class Part;
+    friend class Logic;
+    friend class Scene;
+
+    enum ToolMode
+    {
+        Connect,
+        Disconnect,
+        Select,
+        Pan
+    };
+
+    MainWindow(QWidget *parent = nullptr, QString loadFile = "");
+    ~MainWindow();
+
+    QString currFilename();
+    bool isFileLoaded();
+
+private:
+    Ui::MainWindow *ui;
+
+    Scene* m_scene;
+    ToolMode toolMode;
+    QToolButton *selTool;
+
+    bool simRunning = false;
+
+    QUndoView *undoView;
+
+    bool m_fileLoaded = false;
+    QString m_title;
+    QString m_currFilename;
+
+    QVector<QPushButton*> m_icPushButtons;
+
+    // True if unsaved changes have been made to the file
+    bool unsavedChanges = false;
+
+    // Label seen in the "Integrated Circuits" tab
+    bool tabICInfoLabelExists = true;
+
+    void resetTools();
+
+    void changeMade();
+    void changesSaved();
+
+    void closeEvent(QCloseEvent *event) override;
+
+    void reloadLocalICs();
+
+private slots:
+    void updateMatrix();
+
+    void zoomIn();
+    void zoomOut();
+    void resetZoom();
+    void toggleUndoView();
+
+    void editUndo();
+    void editRedo();
+    void editCut();
+    void editCopy();
+    void editPaste();
+    void editDelete();
+
+    void fileNew();
+    void fileOpen();
+    void fileSave();
+    void fileSaveAs();
+    void fileExit();
+
+    void toolConnect();
+    void toolDisconnect();
+    void toolSelect();
+    void toolPan();
+
+    void toolAddComponent();
+    void toolAddIC();
+
+
+    void simStep();
+    void simStart();
+    void simStop();
+
+    void onLogicTimerTimeout();
+    void onGfxTimerTimeout();
+};
+#endif // MAINWINDOW_H

MainWindow.ui

@@ -0,0 +1,833 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>884</width>
+    <height>611</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QGridLayout" name="gridLayout">
+    <item row="1" column="0" colspan="2">
+     <widget class="QTabWidget" name="tabWidget">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Expanding" vsizetype="Maximum">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="currentIndex">
+       <number>0</number>
+      </property>
+      <widget class="QWidget" name="tabLogicGates">
+       <attribute name="title">
+        <string>Logic Gates</string>
+       </attribute>
+       <layout class="QHBoxLayout" name="horizontalLayout">
+        <item>
+         <widget class="QToolButton" name="btnGateBuffer">
+          <property name="toolTip">
+           <string>Buffer Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/BUFFER.png</normaloff>:/Icons/Resources/BUFFER.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnGateNot">
+          <property name="toolTip">
+           <string>Not Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/NOT.png</normaloff>:/Icons/Resources/NOT.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnGateAnd">
+          <property name="toolTip">
+           <string>And Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/AND.png</normaloff>:/Icons/Resources/AND.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnGateOr">
+          <property name="toolTip">
+           <string>Or Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/OR.png</normaloff>:/Icons/Resources/OR.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnGateNand">
+          <property name="toolTip">
+           <string>Nand Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/NAND.png</normaloff>:/Icons/Resources/NAND.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnGateNor">
+          <property name="toolTip">
+           <string>Nor Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/NOR.png</normaloff>:/Icons/Resources/NOR.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnGateXor">
+          <property name="toolTip">
+           <string>Xor Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/XOR.png</normaloff>:/Icons/Resources/XOR.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnGateXnor">
+          <property name="toolTip">
+           <string>Xnor Gate</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="icon">
+           <iconset resource="Resources.qrc">
+            <normaloff>:/Icons/Resources/XNOR.png</normaloff>:/Icons/Resources/XNOR.png</iconset>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <spacer name="horizontalSpacer">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>0</width>
+            <height>0</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+       </layout>
+      </widget>
+      <widget class="QWidget" name="tabInputOutput">
+       <attribute name="title">
+        <string>Input/Output</string>
+       </attribute>
+       <layout class="QHBoxLayout" name="horizontalLayout_2">
+        <item>
+         <widget class="QToolButton" name="btnIOLowConstant">
+          <property name="toolTip">
+           <string>Low Constant</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnIOHighConstant">
+          <property name="toolTip">
+           <string>High Constant</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnIOToggleButton">
+          <property name="toolTip">
+           <string>Toggle Button</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>64</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QToolButton" name="btnIOLightBulb">
+          <property name="toolTip">
+           <string>Light Bulb</string>
+          </property>
+          <property name="text">
+           <string>...</string>
+          </property>
+          <property name="iconSize">
+           <size>
+            <width>64</width>
+            <height>32</height>
+           </size>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <spacer name="spacer">
+          <property name="orientation">
+           <enum>Qt::Horizontal</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>0</width>
+            <height>0</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
+       </layout>
+      </widget>
+      <widget class="QWidget" name="tabIntegratedCircuits">
+       <attribute name="title">
+        <string>Integrated Circuits</string>
+       </attribute>
+       <layout class="QHBoxLayout" name="horizontalLayout_3">
+        <item>
+         <widget class="QScrollArea" name="tabICScrollArea">
+          <property name="frameShape">
+           <enum>QFrame::NoFrame</enum>
+          </property>
+          <property name="widgetResizable">
+           <bool>true</bool>
+          </property>
+          <widget class="QWidget" name="tabICScrollAreaWidgetContents">
+           <property name="geometry">
+            <rect>
+             <x>0</x>
+             <y>0</y>
+             <width>844</width>
+             <height>64</height>
+            </rect>
+           </property>
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <layout class="QHBoxLayout" name="horizontalLayout_4">
+            <item>
+             <widget class="QLabel" name="tabICInfoLabel">
+              <property name="text">
+               <string>This tab allows you to import .csim files from the directory the file is saved in. To use integrated circuits, please save or open another file.</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </widget>
+         </widget>
+        </item>
+       </layout>
+      </widget>
+     </widget>
+    </item>
+    <item row="0" column="0">
+     <widget class="QGraphicsView" name="graphicsView">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+     </widget>
+    </item>
+    <item row="0" column="1">
+     <widget class="QGroupBox" name="groupBox">
+      <property name="sizePolicy">
+       <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
+        <horstretch>0</horstretch>
+        <verstretch>0</verstretch>
+       </sizepolicy>
+      </property>
+      <property name="title">
+       <string/>
+      </property>
+      <layout class="QVBoxLayout" name="verticalLayout">
+       <item>
+        <widget class="QLabel" name="labelZoomLevel">
+         <property name="text">
+          <string>100%</string>
+         </property>
+         <property name="alignment">
+          <set>Qt::AlignCenter</set>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QToolButton" name="btnZoomIn">
+         <property name="toolTip">
+          <string>Zoom In</string>
+         </property>
+         <property name="text">
+          <string>...</string>
+         </property>
+         <property name="icon">
+          <iconset theme="zoom-in">
+           <normaloff>.</normaloff>.</iconset>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QSlider" name="zoomSlider">
+         <property name="maximum">
+          <number>200</number>
+         </property>
+         <property name="value">
+          <number>100</number>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="tickPosition">
+          <enum>QSlider::TicksBelow</enum>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QToolButton" name="btnZoomOut">
+         <property name="toolTip">
+          <string>Zoom Out</string>
+         </property>
+         <property name="text">
+          <string>...</string>
+         </property>
+         <property name="icon">
+          <iconset theme="zoom-out">
+           <normaloff>.</normaloff>.</iconset>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>884</width>
+     <height>23</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuFile">
+    <property name="title">
+     <string>File</string>
+    </property>
+    <addaction name="actionNew"/>
+    <addaction name="actionOpen"/>
+    <addaction name="actionSave"/>
+    <addaction name="actionSave_As"/>
+    <addaction name="actionExit"/>
+   </widget>
+   <widget class="QMenu" name="menuTools">
+    <property name="title">
+     <string>Tools</string>
+    </property>
+    <addaction name="actionConnect"/>
+    <addaction name="actionRemove_Connections"/>
+    <addaction name="actionSelect"/>
+    <addaction name="actionPan"/>
+   </widget>
+   <widget class="QMenu" name="menuView">
+    <property name="title">
+     <string>View</string>
+    </property>
+    <addaction name="actionZoom_In"/>
+    <addaction name="actionZoom_Out"/>
+    <addaction name="actionReset_Zoom"/>
+    <addaction name="separator"/>
+    <addaction name="actionToggle_Undo_View"/>
+   </widget>
+   <widget class="QMenu" name="menuEdit">
+    <property name="title">
+     <string>Edit</string>
+    </property>
+    <addaction name="actionUndo"/>
+    <addaction name="actionRedo"/>
+    <addaction name="separator"/>
+    <addaction name="actionCut"/>
+    <addaction name="actionCopy"/>
+    <addaction name="actionPaste"/>
+    <addaction name="actionDelete"/>
+   </widget>
+   <widget class="QMenu" name="menuSimulation">
+    <property name="title">
+     <string>Simulation</string>
+    </property>
+    <addaction name="actionStart"/>
+    <addaction name="actionStop"/>
+    <addaction name="actionStep"/>
+   </widget>
+   <widget class="QMenu" name="menuHelp">
+    <property name="title">
+     <string>Help</string>
+    </property>
+    <addaction name="actionTutorial"/>
+    <addaction name="actionAbout"/>
+   </widget>
+   <addaction name="menuFile"/>
+   <addaction name="menuEdit"/>
+   <addaction name="menuView"/>
+   <addaction name="menuTools"/>
+   <addaction name="menuSimulation"/>
+   <addaction name="menuHelp"/>
+  </widget>
+  <widget class="QToolBar" name="toolBarTop">
+   <property name="windowTitle">
+    <string>toolBar</string>
+   </property>
+   <property name="movable">
+    <bool>true</bool>
+   </property>
+   <property name="orientation">
+    <enum>Qt::Horizontal</enum>
+   </property>
+   <property name="floatable">
+    <bool>true</bool>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionNew"/>
+   <addaction name="actionOpen"/>
+   <addaction name="actionSave"/>
+   <addaction name="actionSave_As"/>
+   <addaction name="separator"/>
+   <addaction name="actionUndo"/>
+   <addaction name="actionRedo"/>
+   <addaction name="separator"/>
+   <addaction name="actionCut"/>
+   <addaction name="actionCopy"/>
+   <addaction name="actionPaste"/>
+   <addaction name="actionDelete"/>
+   <addaction name="separator"/>
+   <addaction name="actionZoom_In"/>
+   <addaction name="actionZoom_Out"/>
+   <addaction name="actionReset_Zoom"/>
+   <addaction name="separator"/>
+   <addaction name="actionConnect"/>
+   <addaction name="actionRemove_Connections"/>
+   <addaction name="actionSelect"/>
+   <addaction name="actionPan"/>
+   <addaction name="separator"/>
+   <addaction name="actionStart"/>
+   <addaction name="actionStop"/>
+   <addaction name="actionStep"/>
+  </widget>
+  <widget class="QToolBar" name="toolBarBottom">
+   <property name="windowTitle">
+    <string>toolBar_2</string>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>BottomToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+  <action name="actionOpen">
+   <property name="icon">
+    <iconset theme="document-open">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Open</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+O</string>
+   </property>
+  </action>
+  <action name="actionSave">
+   <property name="icon">
+    <iconset theme="document-save">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Save</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+S</string>
+   </property>
+  </action>
+  <action name="actionSave_As">
+   <property name="icon">
+    <iconset theme="document-save-as">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Save As</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Shift+S</string>
+   </property>
+  </action>
+  <action name="actionExit">
+   <property name="icon">
+    <iconset theme="document-close">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Exit</string>
+   </property>
+   <property name="shortcut">
+    <string>Alt+F4</string>
+   </property>
+  </action>
+  <action name="actionConnect">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="icon">
+    <iconset theme="draw-connector">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Connect Parts</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+J</string>
+   </property>
+  </action>
+  <action name="actionSelect">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="icon">
+    <iconset theme="edit-select">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Select</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+G</string>
+   </property>
+  </action>
+  <action name="actionZoom_In">
+   <property name="icon">
+    <iconset theme="zoom-in">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Zoom In</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+8</string>
+   </property>
+  </action>
+  <action name="actionZoom_Out">
+   <property name="icon">
+    <iconset theme="zoom-out">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Zoom Out</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+9</string>
+   </property>
+  </action>
+  <action name="actionReset_Zoom">
+   <property name="icon">
+    <iconset theme="zoom">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Reset Zoom</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+0</string>
+   </property>
+  </action>
+  <action name="actionPan">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="icon">
+    <iconset theme="hand">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Pan</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+H</string>
+   </property>
+  </action>
+  <action name="actionUndo">
+   <property name="icon">
+    <iconset theme="edit-undo">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Undo</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Z</string>
+   </property>
+  </action>
+  <action name="actionRedo">
+   <property name="icon">
+    <iconset theme="edit-redo">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Redo</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Y</string>
+   </property>
+  </action>
+  <action name="actionCopy">
+   <property name="icon">
+    <iconset theme="edit-copy">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Copy</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+C</string>
+   </property>
+  </action>
+  <action name="actionCut">
+   <property name="icon">
+    <iconset theme="edit-cut">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Cut</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+X</string>
+   </property>
+  </action>
+  <action name="actionPaste">
+   <property name="icon">
+    <iconset theme="edit-paste">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Paste</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+V</string>
+   </property>
+  </action>
+  <action name="actionRemove_Connections">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="icon">
+    <iconset theme="format-remove-node">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Remove Connections</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+U</string>
+   </property>
+  </action>
+  <action name="actionDelete">
+   <property name="icon">
+    <iconset theme="edit-delete">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Delete</string>
+   </property>
+   <property name="shortcut">
+    <string>Del</string>
+   </property>
+  </action>
+  <action name="actionStart">
+   <property name="icon">
+    <iconset theme="media-playback-start">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Start</string>
+   </property>
+  </action>
+  <action name="actionStop">
+   <property name="icon">
+    <iconset theme="media-playback-stop">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Stop</string>
+   </property>
+  </action>
+  <action name="actionStep">
+   <property name="icon">
+    <iconset theme="debug-step-out">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Step</string>
+   </property>
+   <property name="toolTip">
+    <string>Step</string>
+   </property>
+  </action>
+  <action name="actionToggle_Undo_View">
+   <property name="icon">
+    <iconset theme="edit-undo-history">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Toggle Undo View</string>
+   </property>
+   <property name="toolTip">
+    <string>Toggle Undo View</string>
+   </property>
+  </action>
+  <action name="actionTutorial">
+   <property name="icon">
+    <iconset theme="help">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>Tutorial</string>
+   </property>
+  </action>
+  <action name="actionAbout">
+   <property name="icon">
+    <iconset theme="help-about">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>About</string>
+   </property>
+  </action>
+  <action name="actionNew">
+   <property name="icon">
+    <iconset theme="document-new">
+     <normaloff>.</normaloff>.</iconset>
+   </property>
+   <property name="text">
+    <string>New</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+N</string>
+   </property>
+  </action>
+ </widget>
+ <resources>
+  <include location="Resources.qrc"/>
+ </resources>
+ <connections/>
+</ui>

Part.cpp

@@ -0,0 +1,188 @@
+#include "Part.h"
+
+#include <QDebug>
+
+#include <QPainter>
+#include <QStyleOptionGraphicsItem>
+#include <QGraphicsSceneDragDropEvent>
+#include "Connector.h"
+#include "eConnectorType.h"
+#include "MainWindow.h"
+#include "Scene.h"
+#include "Logic.h"
+
+// PUBLIC
+Part::Part(Logic* logic, CircuitItemBaseShape baseShape)
+    :m_logic(logic), m_baseShape(baseShape)
+{
+    // Set flags
+    setFlag(QGraphicsItem::ItemIsMovable);
+    setFlag(QGraphicsItem::ItemIsSelectable);
+    setFlag(QGraphicsItem::ItemSendsScenePositionChanges);
+    // Set default colors
+    m_penColorNormal=Qt::GlobalColor::color1;
+    m_penColorSelected=Qt::GlobalColor::color0;
+    m_penColorSymbol=Qt::GlobalColor::white;
+    m_brushColorNormal=Qt::GlobalColor::blue;
+    m_brushColorSelected=Qt::GlobalColor::blue;
+    // Set default width factor (actual width = 20 * width factor)
+    setWidth(2);
+}
+
+PartType::PartType Part::partType()
+{
+    return m_partType;
+}
+
+void Part::addInputs(int amount)
+{
+    for(int i = 0; i < amount; i++)
+    {
+        Connector *connector = new Connector(m_logic->parentScene(), this, ConnectorType::Input);
+        m_inputs.append(connector);
+        m_logic->m_inputConnectors.append(connector);
+    }
+}
+
+void Part::addOutputs(int amount)
+{
+    for(int i = 0; i < amount; i++)
+    {
+        Connector *connector = new Connector(m_logic->parentScene(), this, ConnectorType::Output);
+        m_outputs.append(connector);
+        m_logic->m_outputConnectors.append(connector);
+    }
+}
+
+void Part::setWidth(int factor)
+{
+    m_widthFactor = factor;
+}
+
+void Part::recalculateLayout()
+{
+    // Add inputs and outputs and position them correctly
+    int yOffsetInputs;
+    int yOffsetOutputs;
+    if(m_baseShape == RoundedRect)
+    {
+        if(m_outputs.length() > m_inputs.length())
+        {
+            yOffsetInputs = 10 + 10 * (m_outputs.length() - m_inputs.length());
+            yOffsetOutputs = 10;
+        }
+        else
+        {
+            yOffsetOutputs = 10 + 10 * (m_inputs.length() - m_outputs.length());
+            yOffsetInputs = 10;
+        }
+    }
+    else // if m_baseShape == Circle
+    {
+        yOffsetInputs = 20;
+        yOffsetOutputs = 20;
+    }
+    for(int i = 0; i < m_inputs.length(); i++)
+    {
+        m_inputs[i]->setPos(0, yOffsetInputs + 20 * i);
+    }
+    for(int i = 0; i < m_outputs.length(); i++)
+    {
+        m_outputs[i]->setPos(20 * m_widthFactor, yOffsetOutputs + 20 * i);
+    }
+}
+
+QRectF Part::boundingRect() const
+{
+    if(m_baseShape == RoundedRect)
+    {
+        int maxConnections = qMax(m_inputs.length(), m_outputs.length());
+        return QRectF(-1, -1, m_widthFactor * 20 + 2, maxConnections * 20 + 2);
+    }
+    else // if m_baseShape == Circle
+        return QRectF(-1, -1, 42, 42);
+}
+
+QPainterPath Part::shape() const
+{
+    QPainterPath path;
+    if(m_baseShape == RoundedRect)
+    {
+        int maxConnections = qMax(m_inputs.length(), m_outputs.length());
+        path.addRect(-1, -1, m_widthFactor * 20 + 2, maxConnections * 20 + 2);
+    }
+    else // if m_baseShape == Circle
+        path.addRect(-1, -1, 42, 42);
+    return path;
+}
+
+void Part::paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget)
+{
+    Q_UNUSED(widget)
+
+    QPen symbolPen = painter->pen();
+    symbolPen.setColor(m_penColorSymbol);
+
+    QBrush symbolBrush = painter->brush();
+
+    QPen pen = painter->pen();
+    pen.setWidth(2);
+
+    QBrush brush = painter->brush();
+    brush.setStyle(Qt::SolidPattern);
+
+    // Set colors according to state
+    if(item->state & QStyle::State_Selected)
+    {
+        pen.setColor(m_penColorSelected);
+        brush.setColor(m_brushColorSelected);
+    }
+    else
+    {
+        pen.setColor(m_penColorNormal);
+        brush.setColor(m_brushColorNormal);
+    }
+    painter->setPen(pen);
+    painter->setBrush(brush);
+
+    // Draw base shape
+    int maxConnections = qMax(m_inputs.length(), m_outputs.length());
+    if(m_baseShape == RoundedRect)
+        painter->drawRoundedRect(0, 0, 20 * m_widthFactor, 20 * maxConnections, 5, 5);
+    else // if m_baseShape == Circle
+        painter->drawEllipse(0, 0, 40, 40);
+    // Draw provided symbol
+    QPainterPath painterPath = symbolPainterPath(QRect(-20, -10 * maxConnections, 40, 20 * maxConnections));
+    painter->setPen(symbolPen);
+    painter->setBrush(symbolBrush);
+    painter->translate(20, 10 * maxConnections);
+    painter->drawPath(painterPath);
+}
+
+QVariant Part::itemChange(GraphicsItemChange change, const QVariant & value)
+{
+    // Update connectors if selection state has changed; this ensures that their pen color changes with that of the CircuitItem
+    if (change == ItemSelectedHasChanged)
+    {
+        for(auto i : m_inputs)
+            i->update();
+        for(auto o : m_outputs)
+            o->update();
+    }
+    return QGraphicsItem::itemChange(change, value);
+}
+
+// PRIVATE
+void Part::updateState()
+{
+    QVector<bool> inputs;
+    inputs.reserve(m_inputs.length());
+    for(auto connector : m_inputs)
+        inputs.append(connector->m_state);
+
+    QVector<bool> outputs = compute(inputs);
+    for(int i = 0; i < m_outputs.length(); i++)
+    {
+        m_outputs[i]->m_state = outputs[i];
+    }
+}

Part.h

@@ -0,0 +1,91 @@
+#ifndef CIRCUITITEM_H
+#define CIRCUITITEM_H
+
+#include <QGraphicsItem>
+#include <QList>
+
+#include "ePartType.h"
+
+class Connector;
+class Logic;
+
+class Part : public QGraphicsItem
+{
+public:
+    friend class Connector;
+    friend class Scene;
+    friend class Logic;
+    friend class AddPart;
+    friend class RemoveParts;
+    friend class RemoveWire;
+    friend class CopyParts;
+
+    friend class FileHandler;
+
+    friend class CircuitBuffer;
+
+    friend class MainWindow;
+
+    enum CircuitItemColorType
+    {
+        PenColorNormal,
+        PenColorSelected,
+        PenColorSymbol,
+        BrushColorNormal,
+        BrushColorSelected
+    };
+
+    enum CircuitItemBaseShape
+    {
+        RoundedRect,
+        Circle // Only supports up to 1 input and 1 output
+    };
+
+    Part(Logic* logic, CircuitItemBaseShape baseShape = RoundedRect);
+
+    PartType::PartType partType();
+
+    void addInputs(int amount);
+    void addOutputs(int amount);
+
+    void setWidth(int factor);
+
+    void addText(); //TODO
+    void addTextEdit(); //TODO
+
+    void recalculateLayout();
+
+    virtual QRectF boundingRect() const override;
+    virtual QPainterPath shape() const override;
+    virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget) override;
+    // Symbol to be drawn inside the circuitItem
+    virtual QPainterPath symbolPainterPath(QRect limits) = 0;
+    virtual QVariant itemChange(GraphicsItemChange change, const QVariant & value) override;
+    // Take the inputs and calculate the outputs based on the part's logic
+    virtual QVector<bool> compute(QVector<bool> inputs) = 0;
+
+protected:
+    Logic* m_logic;
+
+    QVector<Connector*> m_inputs;
+    QVector<Connector*> m_outputs;
+
+    QColor m_penColorNormal;
+    QColor m_penColorSelected;
+    QColor m_penColorSymbol;
+    QColor m_brushColorNormal;
+    QColor m_brushColorSelected;
+
+    CircuitItemBaseShape m_baseShape;
+
+    QPointF m_oldPos;
+
+    PartType::PartType m_partType;
+
+    int m_widthFactor;
+
+private:
+    // Updates all of the outputs using the inputs
+    void updateState();
+};
+#endif // CIRCUITITEM_H

Parts/AndGate.cpp

@@ -0,0 +1,44 @@
+#include "AndGate.h"
+
+#include "../Connector.h"
+
+AndGate::AndGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(2);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> AndGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = inputs[0] && inputs[1];
+    return ret;
+}
+
+QPainterPath AndGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+
+    // Left vertical line
+    painterPath.moveTo(-8, 8);
+    painterPath.lineTo(-8, -8);
+    // Upper horizontal line
+    painterPath.lineTo(-2, -8);
+    // Right arc
+    painterPath.cubicTo(11, -8, 11, 8, -2, 8);
+    // Lower horizontal line
+    painterPath.lineTo(-8, 8);
+    // Upper input line
+    painterPath.moveTo(-14, -4);
+    painterPath.lineTo(-8, -4);
+    // Lower input line
+    painterPath.moveTo(-14, 4);
+    painterPath.lineTo(-8, 4);
+    // Output line
+    painterPath.moveTo(8, 0);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/AndGate.h

@@ -0,0 +1,15 @@
+#ifndef ANDGATE_H
+#define ANDGATE_H
+
+#include "../Part.h"
+
+class AndGate : public Part
+{
+public:
+    AndGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // ANDGATE_H

Parts/BufferGate.cpp

@@ -0,0 +1,38 @@
+#include "BufferGate.h"
+
+#include "../Connector.h"
+
+BufferGate::BufferGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(1);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> BufferGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = inputs[0];
+
+    return ret;
+}
+
+QPainterPath BufferGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+    QPolygon triangle;
+    triangle.append(QPoint(-8, 8));
+    triangle.append(QPoint(-8, -8));
+    triangle.append(QPoint(8, 0));
+    triangle.append(QPoint(-8, 8));
+    painterPath.addPolygon(triangle);
+    // Input line
+    painterPath.moveTo(-14, 0);
+    painterPath.lineTo(-8, 0);
+    // Output line
+    painterPath.moveTo(8, 0);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/BufferGate.h

@@ -0,0 +1,15 @@
+#ifndef BUFFERGATE_H
+#define BUFFERGATE_H
+
+#include "../Part.h"
+
+class BufferGate : public Part
+{
+public:
+    BufferGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // BUFFERGATE_H

Parts/HighConstant.cpp

@@ -0,0 +1,26 @@
+#include "HighConstant.h"
+
+#include "../Connector.h"
+
+HighConstant::HighConstant(Logic* logic)
+    :Part(logic, Circle)
+{
+    addInputs(0);
+    addOutputs(1);
+    recalculateLayout();
+    m_brushColorNormal = Qt::GlobalColor::green;
+    m_brushColorSelected = Qt::GlobalColor::green;
+}
+
+QVector<bool> HighConstant::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = true;
+    return ret;
+}
+
+QPainterPath HighConstant::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    return QPainterPath();
+}

Parts/HighConstant.h

@@ -0,0 +1,15 @@
+#ifndef HIGHCONSTANT_H
+#define HIGHCONSTANT_H
+
+#include "../Part.h"
+
+class HighConstant : public Part
+{
+public:
+    HighConstant(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // HIGHCONSTANT_H

Parts/IntegratedCircuit.cpp

@@ -0,0 +1,56 @@
+#include "IntegratedCircuit.h"
+
+#include "../Scene.h"
+#include "../Logic.h"
+#include "ToggleButton.h"
+#include "LightBulb.h"
+
+static bool compareToggleButtons(const ToggleButton* a, const ToggleButton* b) { return a->y() < b->y(); }
+static bool compareLightBulbs(const LightBulb* a, const LightBulb* b) { return a->y() < b->y(); }
+
+IntegratedCircuit::IntegratedCircuit(Logic* logic, QString filename)
+    :Part(logic), m_filename(filename), m_icLogic(new Logic)
+{
+    setWidth(4);
+
+    m_icLogic->loadFromFile(filename);
+
+    for(auto part : m_icLogic->m_parts)
+    {
+        if(part->partType() == PartType::IOToggleButton)
+            m_icLogicInputs.append((ToggleButton*)part);
+        else if(part->partType() == PartType::IOLightBulb)
+            m_icLogicOutputs.append((LightBulb*)part);
+    }
+
+    addInputs(m_icLogicInputs.length());
+    addOutputs(m_icLogicOutputs.length());
+
+    // Sort according to y position
+    std::sort(m_icLogicInputs.begin(), m_icLogicInputs.end(), compareToggleButtons);
+    std::sort(m_icLogicOutputs.begin(), m_icLogicOutputs.end(), compareLightBulbs);
+
+    recalculateLayout();
+}
+
+QString IntegratedCircuit::filename()
+{
+    return m_filename;
+}
+
+QVector<bool> IntegratedCircuit::compute(QVector<bool> inputs)
+{
+    for(int i = 0; i < inputs.length(); i++)
+        m_icLogicInputs[i]->m_toggleState = inputs[i];
+    m_icLogic->doLogicStep();
+    QVector<bool> ret(m_icLogicOutputs.length());
+    for(int i = 0; i < m_icLogicOutputs.length(); i++)
+        ret[i] = m_icLogicOutputs[i]->m_state;
+    return ret;
+}
+
+QPainterPath IntegratedCircuit::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    return QPainterPath();
+}

Parts/IntegratedCircuit.h

@@ -0,0 +1,31 @@
+#ifndef INTEGRATEDCIRCUIT_H
+#define INTEGRATEDCIRCUIT_H
+
+#include <QString>
+
+#include "../Part.h"
+
+class Logic;
+class ToggleButton;
+class LightBulb;
+
+class IntegratedCircuit : public Part
+{
+public:
+    IntegratedCircuit(Logic* logic, QString filename = "");
+
+    QString filename();
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+
+private:
+    QString m_filename;
+
+    Logic* m_icLogic;
+
+    QVector<ToggleButton*> m_icLogicInputs;
+    QVector<LightBulb*> m_icLogicOutputs;
+};
+
+#endif // INTEGRATEDCIRCUIT_H

Parts/LightBulb.cpp

@@ -0,0 +1,38 @@
+#include "LightBulb.h"
+
+#include "../Connector.h"
+
+LightBulb::LightBulb(Logic* logic)
+    :Part(logic, Circle)
+{
+    addInputs(1);
+    addOutputs(0);
+    recalculateLayout();
+    m_brushColorNormal = Qt::GlobalColor::black;
+    m_brushColorSelected = Qt::GlobalColor::black;
+}
+
+QVector<bool> LightBulb::compute(QVector<bool> inputs)
+{
+    m_state = inputs[0];
+
+    // Set color according to input state (on or off)
+    if(m_state)
+    {
+        m_brushColorNormal = Qt::GlobalColor::green;
+        m_brushColorSelected = Qt::GlobalColor::green;
+    }
+    else
+    {
+        m_brushColorNormal = Qt::GlobalColor::black;
+        m_brushColorSelected = Qt::GlobalColor::black;
+    }
+
+    return QVector<bool>();
+}
+
+QPainterPath LightBulb::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    return QPainterPath();
+}

Parts/LightBulb.h

@@ -0,0 +1,21 @@
+#ifndef LAMP_H
+#define LAMP_H
+
+#include "../Part.h"
+
+class LightBulb : public Part
+{
+public:
+    friend class IntegratedCircuit;
+
+    LightBulb(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+
+private:
+    bool m_state = false;
+};
+
+
+#endif // LAMP_H

Parts/LowConstant.cpp

@@ -0,0 +1,26 @@
+#include "LowConstant.h"
+
+#include "../Connector.h"
+
+LowConstant::LowConstant(Logic* logic)
+    :Part(logic, Circle)
+{
+    addInputs(0);
+    addOutputs(1);
+    recalculateLayout();
+    m_brushColorNormal = Qt::GlobalColor::black;
+    m_brushColorSelected = Qt::GlobalColor::black;
+}
+
+QVector<bool> LowConstant::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = false;
+    return ret;
+}
+
+QPainterPath LowConstant::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    return QPainterPath();
+}

Parts/LowConstant.h

@@ -0,0 +1,15 @@
+#ifndef LOWCONSTANT_H
+#define LOWCONSTANT_H
+
+#include "../Part.h"
+
+class LowConstant : public Part
+{
+public:
+    LowConstant(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // LOWCONSTANT_H

Parts/NandGate.cpp

@@ -0,0 +1,46 @@
+#include "NandGate.h"
+
+#include "../Connector.h"
+
+NandGate::NandGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(2);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> NandGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = !(inputs[0] && inputs[1]);
+    return ret;
+}
+
+QPainterPath NandGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+
+    // Left vertical line
+    painterPath.moveTo(-8, 8);
+    painterPath.lineTo(-8, -8);
+    // Upper horizontal line
+    painterPath.lineTo(-2, -8);
+    // Right arc
+    painterPath.cubicTo(11, -8, 11, 8, -2, 8);
+    // Lower horizontal line
+    painterPath.lineTo(-8, 8);
+    // Inverting dot
+    painterPath.addEllipse(8.f, -1.5f, 3.f, 3.f);
+    // Upper input line
+    painterPath.moveTo(-14, -4);
+    painterPath.lineTo(-8, -4);
+    // Lower input line
+    painterPath.moveTo(-14, 4);
+    painterPath.lineTo(-8, 4);
+    // Output line
+    painterPath.moveTo(11.5f, 0.f);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/NandGate.h

@@ -0,0 +1,15 @@
+#ifndef NANDGATE_H
+#define NANDGATE_H
+
+#include "../Part.h"
+
+class NandGate : public Part
+{
+public:
+    NandGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // NANDGATE_H

Parts/NorGate.cpp

@@ -0,0 +1,49 @@
+#include "NorGate.h"
+
+#include "../Connector.h"
+
+NorGate::NorGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(2);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> NorGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = !(inputs[0] || inputs[1]);
+    return ret;
+}
+
+QPainterPath NorGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+    // Left arc
+    painterPath.moveTo(-10, -8);
+    painterPath.quadTo(-2, 0, -10, 8);
+    // Lower line
+    painterPath.lineTo(-2, 8);
+    // Lower arc
+    painterPath.quadTo(5, 6, 8, 0);
+    //
+    painterPath.moveTo(-10, -8);
+    // Upper line
+    painterPath.lineTo(-2, -8);
+    // Upper arc
+    painterPath.quadTo(5, -6, 8, 0);
+    // Inverting dot
+    painterPath.addEllipse(8.f, -1.5f, 3.f, 3.f);
+    // Upper input line
+    painterPath.moveTo(-14, -4);
+    painterPath.lineTo(-7.5f, -4.f);
+    // Lower input line
+    painterPath.moveTo(-14, 4);
+    painterPath.lineTo(-7.5f, 4.f);
+    // Output line
+    painterPath.moveTo(11.5f, 0.f);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/NorGate.h

@@ -0,0 +1,15 @@
+#ifndef NORGATE_H
+#define NORGATE_H
+
+#include "../Part.h"
+
+class NorGate : public Part
+{
+public:
+    NorGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // NORGATE_H

Parts/NotGate.cpp

@@ -0,0 +1,39 @@
+#include "NotGate.h"
+
+#include "../Connector.h"
+
+NotGate::NotGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(1);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> NotGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = !inputs[0];
+    return ret;
+}
+
+QPainterPath NotGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+    QPolygon triangle;
+    triangle.append(QPoint(-8, 8));
+    triangle.append(QPoint(-8, -8));
+    triangle.append(QPoint(8, 0));
+    triangle.append(QPoint(-8, 8));
+    painterPath.addPolygon(triangle);
+    // Inverting dot
+    painterPath.addEllipse(8.f, -1.5f, 3.f, 3.f);
+    // Input line
+    painterPath.moveTo(-14, 0);
+    painterPath.lineTo(-8, 0);
+    // Output line
+    painterPath.moveTo(11.5f, 0.f);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/NotGate.h

@@ -0,0 +1,15 @@
+#ifndef NOTGATE_H
+#define NOTGATE_H
+
+#include "../Part.h"
+
+class NotGate : public Part
+{
+public:
+    NotGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // NOTGATE_H

Parts/OrGate.cpp

@@ -0,0 +1,47 @@
+#include "OrGate.h"
+
+#include "../Connector.h"
+
+OrGate::OrGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(2);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> OrGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = inputs[0] || inputs[1];
+    return ret;
+}
+
+QPainterPath OrGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+    // Left arc
+    painterPath.moveTo(-10, -8);
+    painterPath.quadTo(-2, 0, -10, 8);
+    // Lower line
+    painterPath.lineTo(-2, 8);
+    // Lower arc
+    painterPath.quadTo(5, 6, 8, 0);
+    //
+    painterPath.moveTo(-10, -8);
+    // Upper line
+    painterPath.lineTo(-2, -8);
+    // Upper arc
+    painterPath.quadTo(5, -6, 8, 0);
+    // Upper input line
+    painterPath.moveTo(-14, -4);
+    painterPath.lineTo(-7.5f, -4.f);
+    // Lower input line
+    painterPath.moveTo(-14, 4);
+    painterPath.lineTo(-7.5f, 4.f);
+    // Output line
+    painterPath.moveTo(8, 0);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/OrGate.h

@@ -0,0 +1,15 @@
+#ifndef ORGATE_H
+#define ORGATE_H
+
+#include "../Part.h"
+
+class OrGate : public Part
+{
+public:
+    OrGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // ORGATE_H

Parts/ToggleButton.cpp

@@ -0,0 +1,43 @@
+#include "ToggleButton.h"
+
+#include <QGraphicsSceneMouseEvent>
+
+ToggleButton::ToggleButton(Logic* logic)
+    :Part(logic, Circle)
+{
+    addInputs(0);
+    addOutputs(1);
+    recalculateLayout();
+    m_brushColorNormal = Qt::GlobalColor::red;
+    m_brushColorSelected = Qt::GlobalColor::red;
+}
+
+QVector<bool> ToggleButton::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = m_toggleState;
+    return ret;
+}
+
+QPainterPath ToggleButton::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    return QPainterPath();
+}
+
+void ToggleButton::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
+{
+    m_toggleState = !m_toggleState;
+    if(m_toggleState)
+    {
+        m_brushColorNormal = Qt::GlobalColor::darkRed;
+        m_brushColorSelected = Qt::GlobalColor::darkRed;
+    }
+    else
+    {
+        m_brushColorNormal = Qt::GlobalColor::red;
+        m_brushColorSelected = Qt::GlobalColor::red;
+    }
+    update();
+    Part::mouseDoubleClickEvent(event);
+}

Parts/ToggleButton.h

@@ -0,0 +1,24 @@
+#ifndef TOGGLEBUTTON_H
+#define TOGGLEBUTTON_H
+
+#include "../Part.h"
+
+class ToggleButton : public Part
+{
+public:
+    friend class IntegratedCircuit;
+
+    ToggleButton(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+
+private:
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) override;
+
+    QPointF m_dragBeginPos;
+
+    bool m_toggleState = false;
+};
+
+#endif // TOGGLEBUTTON_H

Parts/XnorGate.cpp

@@ -0,0 +1,52 @@
+#include "XnorGate.h"
+
+#include "../Connector.h"
+
+XnorGate::XnorGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(2);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> XnorGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = !((inputs[0] || inputs[1]) && (!(inputs[0] && inputs[1])));
+    return ret;
+}
+
+QPainterPath XnorGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+    // 0th Left arc
+    painterPath.moveTo(-12, -8);
+    painterPath.quadTo(-4, 0, -12, 8);
+    // 1st Left arc
+    painterPath.moveTo(-10, -8);
+    painterPath.quadTo(-2, 0, -10, 8);
+    // Lower line
+    painterPath.lineTo(-2, 8);
+    // Lower arc
+    painterPath.quadTo(5, 6, 8, 0);
+    //
+    painterPath.moveTo(-10, -8);
+    // Upper line
+    painterPath.lineTo(-2, -8);
+    // Upper arc
+    painterPath.quadTo(5, -6, 8, 0);
+    // Inverting dot
+    painterPath.addEllipse(8.f, -1.5f, 3.f, 3.f);
+    // Upper input line
+    painterPath.moveTo(-14, -4);
+    painterPath.lineTo(-7.5f, -4.f);
+    // Lower input line
+    painterPath.moveTo(-14, 4);
+    painterPath.lineTo(-7.5f, 4.f);
+    // Output line
+    painterPath.moveTo(11.5f, 0.f);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/XnorGate.h

@@ -0,0 +1,15 @@
+#ifndef XNORGATE_H
+#define XNORGATE_H
+
+#include "../Part.h"
+
+class XnorGate : public Part
+{
+public:
+    XnorGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // XNORGATE_H

Parts/XorGate.cpp

@@ -0,0 +1,50 @@
+#include "XorGate.h"
+
+#include "../Connector.h"
+
+XorGate::XorGate(Logic* logic)
+    :Part(logic)
+{
+    addInputs(2);
+    addOutputs(1);
+    recalculateLayout();
+}
+
+QVector<bool> XorGate::compute(QVector<bool> inputs)
+{
+    QVector<bool> ret(1);
+    ret[0] = (inputs[0] || inputs[1]) && (!(inputs[0] && inputs[1]));
+    return ret;
+}
+
+QPainterPath XorGate::symbolPainterPath(QRect limits)
+{
+    Q_UNUSED(limits)
+    QPainterPath painterPath;
+    // 0th Left arc
+    painterPath.moveTo(-12, -8);
+    painterPath.quadTo(-4, 0, -12, 8);
+    // 1st Left arc
+    painterPath.moveTo(-10, -8);
+    painterPath.quadTo(-2, 0, -10, 8);
+    // Lower line
+    painterPath.lineTo(-2, 8);
+    // Lower arc
+    painterPath.quadTo(5, 6, 8, 0);
+    //
+    painterPath.moveTo(-10, -8);
+    // Upper line
+    painterPath.lineTo(-2, -8);
+    // Upper arc
+    painterPath.quadTo(5, -6, 8, 0);
+    // Upper input line
+    painterPath.moveTo(-14, -4);
+    painterPath.lineTo(-7.5f, -4.f);
+    // Lower input line
+    painterPath.moveTo(-14, 4);
+    painterPath.lineTo(-7.5f, 4.f);
+    // Output line
+    painterPath.moveTo(8, 0);
+    painterPath.lineTo(14, 0);
+    return painterPath;
+}

Parts/XorGate.h

@@ -0,0 +1,15 @@
+#ifndef XORGATE_H
+#define XORGATE_H
+
+#include "../Part.h"
+
+class XorGate : public Part
+{
+public:
+    XorGate(Logic* logic);
+
+    QVector<bool> compute(QVector<bool> inputs) override;
+    QPainterPath symbolPainterPath(QRect limits) override;
+};
+
+#endif // XORGATE_H

README.md

@@ -0,0 +1,24 @@
+# Circuit Logic Simulator #
+### Build Instructions ###
+1.	**Install dependencies:**
+	-	Qt base: `qt5-base`
+	-	QMake: `qt5-tools`
+	-	Compiler: `g++` (>= 7) or `clang` (>=5)
+	-	Note that your distro's package names  might vary. All provided package names are those used by Archlinux, the distro this is being tested on.
+2.	**Clone the repository and cd into it:**
+	$`git clone https://github.com/xypwn/circuit-logic-simulator.git`
+	$`cd circuit-logic-simulator`
+3.	**Create a build directory and cd into it:**
+	$`mkdir build`
+	$`cd build`
+4.	**Configure build using QMake:**
+	$`qmake ..`
+5.	**Start build (replace 4 with the number of threads you have to speed it up)**
+	$`make -j 4`
+6.	**Run the executable:**
+	There should now be an executable file called `CircuitSimulator` in your
+	build folder. You can put it anywhere or run it with:
+	$`./CircuitSimulator`
+### Notes ###
+-	The software is currently under heavy development and therefore still crawling with bugs
+-	The `About` and `Tutorial` menu item haven't yet been implemented

Resources.qrc

@@ -0,0 +1,12 @@
+<RCC>
+    <qresource prefix="/Icons">
+        <file>Resources/AND.png</file>
+        <file>Resources/BUFFER.png</file>
+        <file>Resources/NAND.png</file>
+        <file>Resources/NOR.png</file>
+        <file>Resources/NOT.png</file>
+        <file>Resources/OR.png</file>
+        <file>Resources/XNOR.png</file>
+        <file>Resources/XOR.png</file>
+    </qresource>
+</RCC>

Scene.cpp

@@ -0,0 +1,257 @@
+#include "Scene.h"
+
+#include <MainWindow.h>
+#include <QGraphicsView>
+#include <QGraphicsSceneMouseEvent>
+#include <QMouseEvent>
+#include "Connector.h"
+#include "Wire.h"
+#include "Part.h"
+
+#include "UndoCommands/AddPart.h"
+#include "UndoCommands/AddWire.h"
+#include "UndoCommands/MoveParts.h"
+#include "UndoCommands/RemoveParts.h"
+#include "UndoCommands/RemoveWire.h"
+//#include "UndoCommands/CopyParts.h"
+
+#include "FileHandler.h"
+
+#include "Logic.h"
+
+
+Scene::Scene(QGraphicsView *parentGfxView, MainWindow *parentMainWindow)
+    :m_parentMainWindow(parentMainWindow), m_parentGfxView(parentGfxView), m_logic(new Logic(this)), m_undoStack(new QUndoStack)
+{
+
+}
+
+Scene::~Scene()
+{
+    delete m_logic;
+}
+
+void Scene::updateGraphics()
+{
+    // Update all wires graphically
+    for(auto wire : m_logic->m_wires)
+    {
+        wire->updateLine();
+        wire->update();
+    }
+    // Update all parts graphically
+    for(auto part : m_logic->m_parts)
+    {
+        part->update();
+    }
+}
+
+void Scene::undo()
+{
+    m_undoStack->undo();
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::redo()
+{
+    m_undoStack->redo();
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::initCopy(const QList<Part*> &parts, const QList<Wire*> &wires)
+{
+    m_copyBuffer.clear();
+    m_copyBuffer.addFromScene(parts, wires);
+}
+
+void Scene::doCopy(bool relToMousePos)
+{
+    // Get scene cursor pos
+    QPoint gfxViewCursorPos = m_parentGfxView->mapFromGlobal(QCursor::pos());
+    QPointF sceneCursorPos = m_parentGfxView->mapToScene(gfxViewCursorPos);
+
+    // Get graphics view center scene coordinates
+    QPointF gfxViewSceneCenter = m_parentGfxView->mapToScene(m_parentGfxView->viewport()->rect().center());
+
+    CopyParts* copyPartsCommand;
+    if(relToMousePos)
+        // Paste in the parts with an offset of: (mouse pos) - (average part pos)
+        // Because the offset is relative to the part's previous position
+        copyPartsCommand  = new CopyParts(this, m_copyBuffer, sceneCursorPos - m_copyBuffer.getAvgPartPos());
+    else
+        copyPartsCommand  = new CopyParts(this, m_copyBuffer, gfxViewSceneCenter - m_copyBuffer.getAvgPartPos());
+    m_undoStack->push(copyPartsCommand);
+
+    // Unselect all parts
+    for(auto selectedPart : selectedItems())
+        selectedPart->setSelected(false);
+
+    // Select all recently copied parts
+    for(auto part : copyPartsCommand->m_copiedParts)
+        part->setSelected(true);
+
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::addIC(QString filename)
+{
+    // Set pos to center of user's view
+    QPointF gfxViewSceneCenter = m_parentGfxView->mapToScene(m_parentGfxView->viewport()->rect().center());
+    m_undoStack->push(new AddPart(this, PartType::IntegratedCircuit, gfxViewSceneCenter, filename));
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::addPart(PartType::PartType partType)
+{
+    // Set pos to center of user's view
+    QPointF gfxViewSceneCenter = m_parentGfxView->mapToScene(m_parentGfxView->viewport()->rect().center());
+    m_undoStack->push(new AddPart(this, partType, gfxViewSceneCenter));
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::addWire(Connector* inputConnector, Connector* outputConnector)
+{
+    m_undoStack->push(new AddWire(this, inputConnector, outputConnector));
+
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::removeParts(const QList<Part*>& parts)
+{
+    if(parts.isEmpty())
+        return;
+
+    m_undoStack->push(new RemoveParts(this, parts));
+
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::removeWire(Wire* wire)
+{
+    // Push wire into undo stack
+    m_undoStack->push(new RemoveWire(this, wire));
+
+    m_parentMainWindow->changeMade();
+}
+
+void Scene::moveParts(const QList<Part *>& parts, QPointF relPos)
+{
+    m_undoStack->push(new MoveParts(this, parts, relPos));
+
+    for(auto part : parts)
+    {
+        part->m_oldPos = part->pos();
+    }
+
+    m_parentMainWindow->changeMade();
+}
+
+// PRIVATE
+
+void Scene::startTrackingPart(Part* part)
+{
+    // Show part
+    part->show();
+    // Add part back into tracker list
+    m_logic->m_parts.append(part);
+    for(auto input : part->m_inputs)
+        // Add connector back into tracker list
+        m_logic->m_inputConnectors.append(input);
+    for(auto output : part->m_outputs)
+        // Add connector back into tracker list
+        m_logic->m_outputConnectors.append(output);
+}
+
+void Scene::stopTrackingPart(Part* part)
+{
+    // Hide part
+    part->hide();
+    // Remove part from tracker list
+    m_logic->m_parts.removeOne(part);
+    for(auto input : part->m_inputs)
+        // Add connector from tracker list
+        m_logic->m_inputConnectors.removeOne(input);
+    for(auto output : part->m_outputs)
+        // Add connector from tracker list
+        m_logic->m_outputConnectors.removeOne(output);
+}
+
+void Scene::connectorClicked(Connector *connector)
+{
+    if(m_parentMainWindow->toolMode == MainWindow::Disconnect)
+    {
+        removeConnectorsConnections(connector);
+        return;
+    }
+
+    if(m_parentMainWindow->toolMode == MainWindow::Connect)
+    {
+
+        if(connector->m_connectorType == ConnectorType::Input)
+        {
+            // Toggle off if previous was clicked again
+            if(m_selectedInputConnector == connector)
+            {
+                m_selectedInputConnector->unselect();
+                m_selectedInputConnector = nullptr;
+            }
+            else
+            {
+                // Unselect previous if previous not nullptr
+                if(m_selectedInputConnector) m_selectedInputConnector->unselect();
+                // Update new connection
+                m_selectedInputConnector = connector;
+                connector->select();
+            }
+        }
+        else
+            //Same stuff here, but with connectorSelectedRight instead of connectorSelectedLeft
+        {
+            if(m_selectedOutputConnector == connector)
+            {
+                m_selectedOutputConnector->unselect();
+                m_selectedOutputConnector = nullptr;
+            }
+            else
+            {
+                if(m_selectedOutputConnector) m_selectedOutputConnector->unselect();
+                m_selectedOutputConnector = connector;
+                connector->select();
+            }
+        }
+        // If both sides now have a connector, add a wire
+        if(m_selectedInputConnector && m_selectedOutputConnector)
+        {
+            addWire(m_selectedOutputConnector, m_selectedInputConnector);
+            m_selectedInputConnector->unselect();
+            m_selectedInputConnector = nullptr;
+            m_selectedOutputConnector->unselect();
+            m_selectedOutputConnector = nullptr;
+        }
+    }
+}
+
+void Scene::removeConnectorsConnections(Connector *connector)
+{
+    // Remove wires
+    for(auto wire : connector->m_wires)
+    {
+        removeWire(wire);
+    }
+}
+
+void Scene::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
+{
+    if (event->button() == Qt::LeftButton)
+    {
+        QList<QGraphicsItem*> movedItems = selectedItems();
+        if(!movedItems.isEmpty() && !(((Part*)movedItems[0])->pos() == ((Part*)movedItems[0])->m_oldPos))
+        {
+            QList<Part*> movedParts;
+            for(auto item : movedItems)
+                movedParts.append((Part*)item);
+            moveParts(movedParts, movedParts[0]->pos() - movedParts[0]->m_oldPos);
+        }
+    }
+    QGraphicsScene::mouseReleaseEvent(event);
+}

Scene.h

@@ -0,0 +1,95 @@
+#ifndef SCENE_H
+#define SCENE_H
+
+// The Scene class holds all important information to make a circuit work graphically.
+// This includes things like undo, redo, etc...
+
+#include <QGraphicsScene>
+#include <QUndoStack>
+
+#include "ePartType.h"
+#include "CircuitBuffer.h"
+
+#include "UndoCommands/CopyParts.h"
+
+class MainWindow;
+class Part;
+class Wire;
+class Connector;
+
+class FileHandler;
+class Logic;
+
+class CopyParts;
+
+class Scene : public QGraphicsScene
+{
+public: 
+    friend class Part;
+    friend class Wire;
+    friend class Connector;
+    friend class MainWindow;
+
+    friend class AddPart;
+    friend class RemoveParts;
+    friend class AddWire;
+    friend class RemoveWire;
+    friend class CopyParts;
+    friend class IntegratedCircuit;
+
+    friend class Logic;
+
+    friend class CircuitBuffer;
+
+    Scene(QGraphicsView *parentGfxView, MainWindow *parentMainWindow);
+    ~Scene();
+
+    void updateGraphics();
+
+    void undo();
+    void redo();
+
+    // Initialized a Copy (only puts the parts into copy buffer)
+    void initCopy(const QList<Part*> &parts, const QList<Wire*> &wires);
+    // Does the copy using previously populated copy buffer (pastes parts from copy buffer)
+    void doCopy(bool relToMousePos = false);
+
+    // Adds an IC undoably
+    void addIC(QString filename);
+    // Adds part undoably
+    void addPart(PartType::PartType partType);
+    // Adds wire undoably
+    void addWire(Connector* inputConnector, Connector* outputConnector);
+
+    // Removes part undoably
+    void removeParts(const QList<Part*>& parts);
+    // Removes wire undoably
+    void removeWire(Wire* wire);
+    // Undoably moves parts
+    void moveParts(const QList<Part*>& parts, QPointF relPos);
+
+private:
+    MainWindow *m_parentMainWindow;
+    QGraphicsView *m_parentGfxView;
+
+    Logic *m_logic;
+
+    QUndoStack *m_undoStack;
+
+    Connector* m_selectedInputConnector = nullptr;
+    Connector* m_selectedOutputConnector = nullptr;
+
+    CircuitBuffer m_copyBuffer;
+
+    void startTrackingPart(Part* part);
+    void stopTrackingPart(Part* part);
+
+    // Called by Connector when it is clicked, for example when creating or deleting wires
+    void connectorClicked(Connector *connector);
+    // Removal is done undoably
+    void removeConnectorsConnections(Connector *connector);
+
+    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
+};
+
+#endif // SCENE_H

UndoCommands/AddPart.cpp

@@ -0,0 +1,42 @@
+#include "AddPart.h"
+
+#include "RemoveWire.h"
+
+#include "../Part.h"
+#include "../Connector.h"
+#include "../Scene.h"
+#include "../Logic.h"
+#include "../Parts/IntegratedCircuit.h"
+
+#include <QDebug>
+
+AddPart::AddPart(Scene* scene, PartType::PartType partType, QPointF pos, QString icFilename)
+    :m_scene(scene), m_partType(partType), m_pos(pos), m_icFilename(icFilename)
+{
+    setText("Add Part");
+}
+
+AddPart::~AddPart()
+{
+    m_scene->m_logic->deletePart(m_part);
+}
+
+void AddPart::redo()
+{
+    if(!m_part)
+    {
+        if(m_partType == PartType::IntegratedCircuit)
+            m_part = m_scene->m_logic->createIC(m_icFilename, m_pos);
+        else
+            m_part = m_scene->m_logic->createPart(m_partType, m_pos);
+    }
+    else
+    {
+        m_scene->startTrackingPart(m_part);
+    }
+}
+
+void AddPart::undo()
+{
+    m_scene->stopTrackingPart(m_part);
+}

UndoCommands/AddPart.h

@@ -0,0 +1,30 @@
+#ifndef ADDPART_H
+#define ADDPART_H
+
+#include <QUndoCommand>
+#include <QPointF>
+
+#include "../ePartType.h"
+
+class Scene;
+class Part;
+class RemovePart;
+
+class AddPart : public QUndoCommand
+{
+public:
+    AddPart(Scene* scene, PartType::PartType partType, QPointF pos, QString icFilename = "");
+    ~AddPart();
+
+    void redo() override;
+    void undo() override;
+
+private:
+    Scene* m_scene;
+    Part* m_part = nullptr;
+    PartType::PartType m_partType;
+    QPointF m_pos;
+    QString m_icFilename;
+};
+
+#endif // ADDPART_H

UndoCommands/AddWire.cpp

@@ -0,0 +1,26 @@
+#include "AddWire.h"
+
+#include "../Scene.h"
+#include "../Logic.h"
+#include "../Wire.h"
+
+AddWire::AddWire(Scene* scene, Connector* connectorInput, Connector* connectorOutput)
+    :m_scene(scene), m_connectorInput(connectorInput), m_connectorOutput(connectorOutput)
+{
+    setText("Add Wire");
+}
+
+AddWire::~AddWire()
+{
+}
+
+
+void AddWire::redo()
+{
+    m_wire = m_scene->m_logic->createWire(m_connectorInput, m_connectorOutput);
+}
+
+void AddWire::undo()
+{
+    m_scene->m_logic->deleteWire(m_wire);
+}

UndoCommands/AddWire.h

@@ -0,0 +1,26 @@
+#ifndef ADDWIRE_H
+#define ADDWIRE_H
+
+#include <QUndoCommand>
+
+class Scene;
+class Wire;
+class Connector;
+
+class AddWire : public QUndoCommand
+{
+public:
+    AddWire(Scene* scene, Connector* connectorInput, Connector* connectorOutput);
+    ~AddWire();
+
+    void redo() override;
+    void undo() override;
+
+private:
+    Scene* m_scene;
+    Wire* m_wire;
+    Connector* m_connectorInput;
+    Connector* m_connectorOutput;
+};
+
+#endif // ADDWIRE_H

UndoCommands/CopyParts.cpp

@@ -0,0 +1,59 @@
+#include "CopyParts.h"
+
+#include <QMap>
+
+#include "../Scene.h"
+#include "../Logic.h"
+#include "../Part.h"
+#include "../Connector.h"
+#include "../CircuitBuffer.h"
+
+#include "RemoveWire.h"
+
+CopyParts::CopyParts(Scene* scene, const CircuitBuffer& toCopy, QPointF relPos)
+    :m_scene(scene), m_toCopy(toCopy), m_relPos(relPos), m_wireUndoStack(new QUndoStack)
+{
+    setText("Copy Parts with offset " + QString::number(relPos.x()) + ", " + QString::number(relPos.y()));
+}
+
+CopyParts::~CopyParts()
+{
+    for(auto part : m_copiedParts)
+        m_scene->m_logic->deletePart(part);
+}
+
+void CopyParts::redo()
+{
+    if(m_isFirstRedo)
+    {
+        m_isFirstRedo = false;
+
+        m_copiedParts = m_toCopy.addIntoScene(m_scene, m_relPos).first;
+    }
+    else
+    {
+        for(auto part : m_copiedParts)
+            m_scene->startTrackingPart(part);
+        // Add wires back in
+        while(m_wireUndoStack->canUndo())
+                m_wireUndoStack->undo();
+    }
+}
+
+void CopyParts::undo()
+{
+    for(auto part : m_copiedParts)
+    {
+        m_scene->stopTrackingPart(part);
+        for(auto input : part->m_inputs)
+        {
+            for(auto wire : input->m_wires)
+                m_wireUndoStack->push(new RemoveWire(m_scene, wire));
+        }
+        for(auto output : part->m_outputs)
+        {
+            for(auto wire : output->m_wires)
+                m_wireUndoStack->push(new RemoveWire(m_scene, wire));
+        }
+    }
+}

UndoCommands/CopyParts.h

@@ -0,0 +1,43 @@
+#ifndef COPYPARTS_H
+#define COPYPARTS_H
+
+#include <QUndoStack>
+#include <QUndoCommand>
+#include <QList>
+#include <QPointF>
+
+#include "../ePartType.h"
+
+class Scene;
+class Part;
+class Wire;
+
+class CircuitBuffer;
+
+class CopyParts : public QUndoCommand
+{
+public:
+    typedef QPair<PartType::PartType, QPointF> PartData;
+    typedef QPair<PartData*, PartData*> WireData;
+
+    friend class Scene;
+
+    CopyParts(Scene* scene, const CircuitBuffer& toCopy, QPointF relPos);
+    ~CopyParts();
+
+    void redo() override;
+    void undo() override;
+
+private:
+    Scene* m_scene;
+    // Since m_toCopy get used immediately, there shouldn't be any segfaults due to any parts that have changed
+    const CircuitBuffer& m_toCopy;
+    QList<Part*> m_copiedParts;
+    QPointF m_relPos;
+
+    bool m_isFirstRedo = true;
+
+    QUndoStack* m_wireUndoStack;
+};
+
+#endif // COPYPARTS_H

UndoCommands/MoveParts.cpp

@@ -0,0 +1,31 @@
+#include "MoveParts.h"
+
+#include "../Part.h"
+
+MoveParts::MoveParts(Scene* scene, const QList<Part*>& parts, QPointF relPos)
+    :m_scene(scene), m_parts(parts), m_relPos(relPos)
+{
+    setText("Move parts by " + QString::number(relPos.x()) + ", " + QString::number(relPos.y()));
+}
+
+MoveParts::~MoveParts()
+{
+}
+
+void MoveParts::redo()
+{
+    if(m_isFirstRedo)
+        m_isFirstRedo = false;
+    else
+    {
+        for(auto part : m_parts)
+            part->moveBy(m_relPos.x(), m_relPos.y());
+    }
+}
+
+
+void MoveParts::undo()
+{
+    for(auto part : m_parts)
+        part->moveBy(-m_relPos.x(), -m_relPos.y());
+}

UndoCommands/MoveParts.h

@@ -0,0 +1,27 @@
+#ifndef MOVEPARTS_H
+#define MOVEPARTS_H
+
+#include <QUndoCommand>
+#include <QPointF>
+
+class Scene;
+class Part;
+
+class MoveParts : public QUndoCommand
+{
+public:
+    MoveParts(Scene* scene, const QList<Part*>& parts, QPointF relPos);
+    ~MoveParts();
+
+    void redo() override;
+    void undo() override;
+
+private:
+    Scene* m_scene;
+    QList<Part*> m_parts;
+    QPointF m_relPos;
+
+    bool m_isFirstRedo = true;
+};
+
+#endif // MOVEPARTS_H

UndoCommands/RemoveParts.cpp

@@ -0,0 +1,52 @@
+#include "RemoveParts.h"
+
+#include "../Scene.h"
+#include "../Part.h"
+#include "../Connector.h"
+#include "../Logic.h"
+#include "RemoveWire.h"
+
+RemoveParts::RemoveParts(Scene* scene, const QList<Part*>& parts)
+    :m_scene(scene), m_parts(parts), m_wireUndoStack(new QUndoStack)
+{
+    setText("Remove Parts");
+}
+
+RemoveParts::~RemoveParts()
+{
+    for(auto part : m_parts)
+        m_scene->m_logic->deletePart(part);
+    delete m_wireUndoStack;
+}
+
+void RemoveParts::redo()
+{
+    for(auto part : m_parts)
+    {
+        for(auto input : part->m_inputs)
+        {
+            for(auto wire : input->m_wires)
+                // Remove wire
+                m_wireUndoStack->push(new RemoveWire(m_scene, wire));
+        }
+        for(auto output : part->m_outputs)
+        {
+            for(auto wire : output->m_wires)
+                // Remove wire
+                m_wireUndoStack->push(new RemoveWire(m_scene, wire));
+        }
+        m_scene->stopTrackingPart(part);
+    }
+}
+
+void RemoveParts::undo()
+{
+    for(auto part : m_parts)
+    {
+        m_scene->startTrackingPart(part);
+
+        // Add wires back in
+        while(m_wireUndoStack->canUndo())
+                m_wireUndoStack->undo();
+        }
+}

UndoCommands/RemoveParts.h

@@ -0,0 +1,27 @@
+#ifndef REMOVEPARTS_H
+#define REMOVEPARTS_H
+
+#include <QUndoCommand>
+#include <QList>
+
+class Scene;
+class Part;
+class Connector;
+
+class RemoveParts : public QUndoCommand
+{
+public:
+    RemoveParts(Scene* scene, const QList<Part*>& parts);
+    ~RemoveParts();
+
+    void redo() override;
+    void undo() override;
+
+private:
+    Scene* m_scene;
+    QList<Part*> m_parts;
+
+    QUndoStack* m_wireUndoStack;
+};
+
+#endif // REMOVEPARTS_H

UndoCommands/RemoveWire.cpp

@@ -0,0 +1,36 @@
+#include "RemoveWire.h"
+
+#include "../Scene.h"
+#include "../Logic.h"
+#include "../Wire.h"
+#include "../Part.h"
+#include "../Connector.h"
+
+RemoveWire::RemoveWire(Scene* scene, Wire* wire)
+    :m_scene(scene), m_wire(wire)
+{
+    setText("Remove Wire");
+
+    m_wireInputPart = (Part*)wire->m_connectorInput->parentItem();
+    m_wireInputConnectorIdx = m_wireInputPart->m_outputs.indexOf(wire->m_connectorInput);
+
+    m_wireOutputPart = (Part*)wire->m_connectorOutput->parentItem();
+    m_wireOutputConnectorIdx = m_wireOutputPart->m_inputs.indexOf(wire->m_connectorOutput);
+}
+
+RemoveWire::~RemoveWire()
+{
+}
+
+void RemoveWire::redo()
+{
+    m_scene->m_logic->deleteWire(m_wire);
+}
+
+
+void RemoveWire::undo()
+{
+    Connector* inputConnector = m_wireInputPart->m_outputs[m_wireInputConnectorIdx];
+    Connector* outputConnector = m_wireOutputPart->m_inputs[m_wireOutputConnectorIdx];
+    m_wire = m_scene->m_logic->createWire(inputConnector, outputConnector);
+}

UndoCommands/RemoveWire.h

@@ -0,0 +1,28 @@
+#ifndef REMOVEWIRE_H
+#define REMOVEWIRE_H
+
+#include <QUndoCommand>
+
+class Scene;
+class Wire;
+class Part;
+
+class RemoveWire : public QUndoCommand
+{
+public:    
+    RemoveWire(Scene* scene, Wire* wire);
+    ~RemoveWire();
+
+    void redo() override;
+    void undo() override;
+
+private:  
+    Scene* m_scene;
+    Wire* m_wire;
+    Part* m_wireInputPart;
+    int m_wireInputConnectorIdx;
+    Part* m_wireOutputPart;
+    int m_wireOutputConnectorIdx;
+};
+
+#endif // REMOVEWIRE_H

Wire.cpp

@@ -0,0 +1,48 @@
+#include "Wire.h"
+
+#include <QPainter>
+#include <qdebug.h>
+#include "Connector.h"
+#include "eConnectorType.h"
+
+Wire::Wire(Scene* scene, Connector *A, Connector *B)
+    :m_scene(scene)
+{
+    if(A->connectorType() == B->connectorType())
+    {
+        qFatal("Instance CircuitWire cannot connect two CircuitConnectors which are on the same side of a CircuitItem");
+    }
+    if(A->connectorType() == ConnectorType::Output)
+    {
+        m_connectorInput = A;
+        m_connectorOutput = B;
+    }
+    else
+    {
+        m_connectorInput = B;
+        m_connectorOutput = A;
+    }
+
+    updateLine();
+}
+
+void Wire::updateLine()
+{
+    QPointF posI = m_connectorInput->scenePos();
+    QPointF posO = m_connectorOutput->scenePos();
+    setLine(posI.x() + 11.f, posI.y(), posO.x() - 11.f, posO.y());
+    QPen p;
+    p.setWidth(2);
+    if(m_state)
+        p.setColor(Qt::GlobalColor::green);
+    setPen(p);
+}
+
+void Wire::feedInput()
+{
+    // Update output state
+    //m_connectorOutput->m_state = true;
+    m_connectorOutput->m_state = (m_connectorOutput->m_state || m_connectorInput->m_state);
+    // Update own state
+    m_state = m_connectorInput->m_state;
+}

Wire.h

@@ -0,0 +1,38 @@
+#ifndef CIRCUITWIRE_H
+#define CIRCUITWIRE_H
+
+#include <QGraphicsLineItem>
+
+class Connector;
+class Scene;
+
+class Wire : public QGraphicsLineItem
+{
+public:
+    friend class Connector;
+    friend class Scene;
+    friend class Logic;
+
+    friend class RemoveWire;
+
+    friend class MainWindow;
+
+    friend class FileHandler;
+
+    friend class CircuitBuffer;
+
+    // Assumes that the CircuitConnectors A and B each have a different orientation
+    Wire(Scene* scene, Connector *A, Connector *B);
+
+    void updateLine(); // Graphical update
+    void feedInput(); // Logical update (feeds input to output and updates state, also causes a graphical update)
+private:
+    Scene* m_scene;
+
+    Connector* m_connectorInput; // connector inputting to this wire
+    Connector* m_connectorOutput; // connector receiving output from this wire
+
+    bool m_state = false;
+};
+
+#endif // CIRCUITWIRE_H

eConnectorType.h

@@ -0,0 +1,13 @@
+#ifndef CONNECTORTYPE_H
+#define CONNECTORTYPE_H
+
+namespace ConnectorType
+{
+    enum ConnectorType
+    {
+        Input,
+        Output
+    };
+}
+
+#endif // CONNECTORTYPE_H

ePartType.h

@@ -0,0 +1,24 @@
+#ifndef EPARTTYPE_H
+#define EPARTTYPE_H
+
+namespace PartType
+{
+    enum PartType
+    {
+        GateBuffer,
+        GateNot,
+        GateAnd,
+        GateOr,
+        GateNand,
+        GateNor,
+        GateXor,
+        GateXnor,
+        IOLowConstant,
+        IOHighConstant,
+        IOLightBulb,
+        IOToggleButton,
+        IntegratedCircuit,
+    };
+}
+
+#endif // EPARTTYPE_H

main.cpp

@@ -0,0 +1,13 @@
+#include "MainWindow.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    QString loadFile;
+    if(argc >= 2)
+        loadFile = argv[1];
+    MainWindow w(nullptr, loadFile);
+    w.show();
+    return a.exec();
+}