Merge pull request #40 from huderlem/connect

Edit Map Connections

editor.cpp

@@ -3,8 +3,9 @@
 #include <QPainter>
 #include <QMouseEvent>
 
-Editor::Editor()
+Editor::Editor(Ui::MainWindow* ui)
 {
+    this->ui = ui;
     selected_events = new QList<DraggablePixmapItem*>;
 }
 
@@ -37,9 +38,11 @@ void Editor::redo() {
 void Editor::setEditingMap() {
     current_view = map_item;
     if (map_item) {
+        displayMapConnections();
         map_item->draw();
         map_item->setVisible(true);
         map_item->setEnabled(true);
+        setConnectionsVisibility(true);
     }
     if (collision_item) {
         collision_item->setVisible(false);
@@ -47,13 +50,15 @@ void Editor::setEditingMap() {
     if (objects_group) {
         objects_group->setVisible(false);
     }
+    setBorderItemsVisible(true);
+    setConnectionItemsVisible(false);
 }
 
 void Editor::setEditingCollision() {
     current_view = collision_item;
     if (collision_item) {
-        collision_item->draw();
         collision_item->setVisible(true);
+        setConnectionsVisibility(true);
     }
     if (map_item) {
         map_item->setVisible(false);
@@ -61,6 +66,8 @@ void Editor::setEditingCollision() {
     if (objects_group) {
         objects_group->setVisible(false);
     }
+    setBorderItemsVisible(true);
+    setConnectionItemsVisible(false);
 }
 
 void Editor::setEditingObjects() {
@@ -71,10 +78,232 @@ void Editor::setEditingObjects() {
     if (map_item) {
         map_item->setVisible(true);
         map_item->setEnabled(false);
+        setConnectionsVisibility(true);
     }
     if (collision_item) {
         collision_item->setVisible(false);
     }
+    setBorderItemsVisible(true);
+    setConnectionItemsVisible(false);
+}
+
+void Editor::setEditingConnections() {
+    current_view = map_item;
+    if (map_item) {
+        map_item->draw();
+        map_item->setVisible(true);
+        map_item->setEnabled(false);
+        populateConnectionMapPickers();
+        ui->label_NumConnections->setText(QString::number(map->connections.length()));
+        setConnectionsVisibility(false);
+        setDiveEmergeControls();
+        setConnectionEditControlsEnabled(selected_connection_item != NULL);
+        if (selected_connection_item) {
+            onConnectionOffsetChanged(selected_connection_item->connection->offset.toInt());
+            setConnectionMap(selected_connection_item->connection->map_name);
+            setCurrentConnectionDirection(selected_connection_item->connection->direction);
+        }
+    }
+    if (collision_item) {
+        collision_item->setVisible(false);
+    }
+    if (objects_group) {
+        objects_group->setVisible(false);
+    }
+    setBorderItemsVisible(true, 0.4);
+    setConnectionItemsVisible(true);
+}
+
+void Editor::setDiveEmergeControls() {
+    ui->comboBox_DiveMap->blockSignals(true);
+    ui->comboBox_EmergeMap->blockSignals(true);
+    ui->comboBox_DiveMap->setCurrentText("");
+    ui->comboBox_EmergeMap->setCurrentText("");
+    for (Connection* connection : map->connections) {
+        if (connection->direction == "dive") {
+            ui->comboBox_DiveMap->setCurrentText(connection->map_name);
+        } else if (connection->direction == "emerge") {
+            ui->comboBox_EmergeMap->setCurrentText(connection->map_name);
+        }
+    }
+    ui->comboBox_DiveMap->blockSignals(false);
+    ui->comboBox_EmergeMap->blockSignals(false);
+}
+
+void Editor::populateConnectionMapPickers() {
+    ui->comboBox_ConnectedMap->blockSignals(true);
+    ui->comboBox_DiveMap->blockSignals(true);
+    ui->comboBox_EmergeMap->blockSignals(true);
+
+    ui->comboBox_ConnectedMap->clear();
+    ui->comboBox_ConnectedMap->addItems(*project->mapNames);
+    ui->comboBox_DiveMap->clear();
+    ui->comboBox_DiveMap->addItems(*project->mapNames);
+    ui->comboBox_EmergeMap->clear();
+    ui->comboBox_EmergeMap->addItems(*project->mapNames);
+
+    ui->comboBox_ConnectedMap->blockSignals(false);
+    ui->comboBox_DiveMap->blockSignals(true);
+    ui->comboBox_EmergeMap->blockSignals(true);
+}
+
+void Editor::setConnectionItemsVisible(bool visible) {
+    for (ConnectionPixmapItem* item : connection_edit_items) {
+        item->setVisible(visible);
+        item->setEnabled(visible);
+    }
+}
+
+void Editor::setBorderItemsVisible(bool visible, qreal opacity) {
+    for (QGraphicsPixmapItem* item : borderItems) {
+        item->setVisible(visible);
+        item->setOpacity(opacity);
+    }
+}
+
+void Editor::setCurrentConnectionDirection(QString curDirection) {
+    if (!selected_connection_item)
+        return;
+
+    selected_connection_item->connection->direction = curDirection;
+
+    Map *connected_map = project->getMap(selected_connection_item->connection->map_name);
+    QPixmap pixmap = connected_map->renderConnection(*selected_connection_item->connection);
+    int offset = selected_connection_item->connection->offset.toInt(nullptr, 0);
+    selected_connection_item->initialOffset = offset;
+    int x = 0, y = 0;
+    if (selected_connection_item->connection->direction == "up") {
+        x = offset * 16;
+        y = -pixmap.height();
+    } else if (selected_connection_item->connection->direction == "down") {
+        x = offset * 16;
+        y = map->getHeight() * 16;
+    } else if (selected_connection_item->connection->direction == "left") {
+        x = -pixmap.width();
+        y = offset * 16;
+    } else if (selected_connection_item->connection->direction == "right") {
+        x = map->getWidth() * 16;
+        y = offset * 16;
+    }
+
+    selected_connection_item->basePixmap = pixmap;
+    QPainter painter(&pixmap);
+    painter.setPen(QColor(255, 0, 255));
+    painter.drawRect(0, 0, pixmap.width() - 1, pixmap.height() - 1);
+    painter.end();
+    selected_connection_item->setPixmap(pixmap);
+    selected_connection_item->initialX = x;
+    selected_connection_item->initialY = y;
+    selected_connection_item->blockSignals(true);
+    selected_connection_item->setX(x);
+    selected_connection_item->setY(y);
+    selected_connection_item->setZValue(-1);
+    selected_connection_item->blockSignals(false);
+
+    setConnectionEditControlValues(selected_connection_item->connection);
+}
+
+void Editor::updateCurrentConnectionDirection(QString curDirection) {
+    if (!selected_connection_item)
+        return;
+
+    QString originalDirection = selected_connection_item->connection->direction;
+    setCurrentConnectionDirection(curDirection);
+    updateMirroredConnectionDirection(selected_connection_item->connection, originalDirection);
+}
+
+void Editor::onConnectionMoved(Connection* connection) {
+    updateMirroredConnectionOffset(connection);
+    onConnectionOffsetChanged(connection->offset.toInt());
+}
+
+void Editor::onConnectionOffsetChanged(int newOffset) {
+    ui->spinBox_ConnectionOffset->blockSignals(true);
+    ui->spinBox_ConnectionOffset->setValue(newOffset);
+    ui->spinBox_ConnectionOffset->blockSignals(false);
+
+}
+
+void Editor::setConnectionEditControlValues(Connection* connection) {
+    QString mapName = connection ? connection->map_name : "";
+    QString direction = connection ? connection->direction : "";
+    int offset = connection ? connection->offset.toInt() : 0;
+
+    ui->comboBox_ConnectedMap->blockSignals(true);
+    ui->comboBox_ConnectionDirection->blockSignals(true);
+    ui->spinBox_ConnectionOffset->blockSignals(true);
+
+    ui->comboBox_ConnectedMap->setCurrentText(mapName);
+    ui->comboBox_ConnectionDirection->setCurrentText(direction);
+    ui->spinBox_ConnectionOffset->setValue(offset);
+
+    ui->comboBox_ConnectedMap->blockSignals(false);
+    ui->comboBox_ConnectionDirection->blockSignals(false);
+    ui->spinBox_ConnectionOffset->blockSignals(false);
+}
+
+void Editor::setConnectionEditControlsEnabled(bool enabled) {
+    ui->comboBox_ConnectionDirection->setEnabled(enabled);
+    ui->comboBox_ConnectedMap->setEnabled(enabled);
+    ui->spinBox_ConnectionOffset->setEnabled(enabled);
+
+    if (!enabled) {
+        setConnectionEditControlValues(false);
+    }
+}
+
+void Editor::onConnectionItemSelected(ConnectionPixmapItem* connectionItem) {
+    if (!connectionItem)
+        return;
+
+    for (ConnectionPixmapItem* item : connection_edit_items) {
+        bool isSelectedItem = item == connectionItem;
+        int zValue = isSelectedItem ? 0 : -1;
+        qreal opacity = isSelectedItem ? 1 : 0.75;
+        item->setZValue(zValue);
+        item->render(opacity);
+        if (isSelectedItem) {
+            QPixmap pixmap = item->pixmap();
+            QPainter painter(&pixmap);
+            painter.setPen(QColor(255, 0, 255));
+            painter.drawRect(0, 0, pixmap.width() - 1, pixmap.height() - 1);
+            painter.end();
+            item->setPixmap(pixmap);
+        }
+    }
+    selected_connection_item = connectionItem;
+    setConnectionEditControlsEnabled(true);
+    setConnectionEditControlValues(selected_connection_item->connection);
+    ui->spinBox_ConnectionOffset->setMaximum(selected_connection_item->getMaxOffset());
+    ui->spinBox_ConnectionOffset->setMinimum(selected_connection_item->getMinOffset());
+    onConnectionOffsetChanged(selected_connection_item->connection->offset.toInt());
+}
+
+void Editor::setSelectedConnectionFromMap(QString mapName) {
+    // Search for the first connection that connects to the given map map.
+    for (ConnectionPixmapItem* item : connection_edit_items) {
+        if (item->connection->map_name == mapName) {
+            onConnectionItemSelected(item);
+            break;
+        }
+    }
+}
+
+void Editor::onConnectionItemDoubleClicked(ConnectionPixmapItem* connectionItem) {
+    emit loadMapRequested(connectionItem->connection->map_name, map->name);
+}
+
+void Editor::onConnectionDirectionChanged(QString newDirection) {
+    ui->comboBox_ConnectionDirection->blockSignals(true);
+    ui->comboBox_ConnectionDirection->setCurrentText(newDirection);
+    ui->comboBox_ConnectionDirection->blockSignals(false);
+}
+
+void Editor::setConnectionsVisibility(bool visible) {
+    for (QGraphicsPixmapItem* item : map->connection_items) {
+        item->setVisible(visible);
+        item->setActive(visible);
+    }
 }
 
 void Editor::setMap(QString map_name) {
@@ -205,33 +434,65 @@ DraggablePixmapItem *Editor::addMapObject(Event *event) {
 }
 
 void Editor::displayMapConnections() {
+    for (QGraphicsPixmapItem* item : map->connection_items) {
+        delete item;
+    }
+    map->connection_items.clear();
+
+    for (ConnectionPixmapItem* item : connection_edit_items) {
+        delete item;
+    }
+    selected_connection_item = NULL;
+    connection_edit_items.clear();
+
     for (Connection *connection : map->connections) {
         if (connection->direction == "dive" || connection->direction == "emerge") {
             continue;
         }
-        Map *connected_map = project->getMap(connection->map_name);
-        QPixmap pixmap = connected_map->renderConnection(*connection);
-        int offset = connection->offset.toInt(nullptr, 0);
-        int x = 0, y = 0;
-        if (connection->direction == "up") {
-            x = offset * 16;
-            y = -pixmap.height();
-        } else if (connection->direction == "down") {
-            x = offset * 16;
-            y = map->getHeight() * 16;
-        } else if (connection->direction == "left") {
-            x = -pixmap.width();
-            y = offset * 16;
-        } else if (connection->direction == "right") {
-            x = map->getWidth() * 16;
-            y = offset * 16;
-        }
-        QGraphicsPixmapItem *item = new QGraphicsPixmapItem(pixmap);
-        item->setZValue(-1);
-        item->setX(x);
-        item->setY(y);
-        scene->addItem(item);
+        createConnectionItem(connection, false);
     }
+
+    if (!connection_edit_items.empty()) {
+        onConnectionItemSelected(connection_edit_items.first());
+    }
+}
+
+void Editor::createConnectionItem(Connection* connection, bool hide) {
+    Map *connected_map = project->getMap(connection->map_name);
+    QPixmap pixmap = connected_map->renderConnection(*connection);
+    int offset = connection->offset.toInt(nullptr, 0);
+    int x = 0, y = 0;
+    if (connection->direction == "up") {
+        x = offset * 16;
+        y = -pixmap.height();
+    } else if (connection->direction == "down") {
+        x = offset * 16;
+        y = map->getHeight() * 16;
+    } else if (connection->direction == "left") {
+        x = -pixmap.width();
+        y = offset * 16;
+    } else if (connection->direction == "right") {
+        x = map->getWidth() * 16;
+        y = offset * 16;
+    }
+
+    QGraphicsPixmapItem *item = new QGraphicsPixmapItem(pixmap);
+    item->setZValue(-1);
+    item->setX(x);
+    item->setY(y);
+    scene->addItem(item);
+    map->connection_items.append(item);
+    item->setVisible(!hide);
+
+    ConnectionPixmapItem *connection_edit_item = new ConnectionPixmapItem(pixmap, connection, x, y, map->getWidth(), map->getHeight());
+    connection_edit_item->setX(x);
+    connection_edit_item->setY(y);
+    connection_edit_item->setZValue(-1);
+    scene->addItem(connection_edit_item);
+    connect(connection_edit_item, SIGNAL(connectionMoved(Connection*)), this, SLOT(onConnectionMoved(Connection*)));
+    connect(connection_edit_item, SIGNAL(connectionItemSelected(ConnectionPixmapItem*)), this, SLOT(onConnectionItemSelected(ConnectionPixmapItem*)));
+    connect(connection_edit_item, SIGNAL(connectionItemDoubleClicked(ConnectionPixmapItem*)), this, SLOT(onConnectionItemDoubleClicked(ConnectionPixmapItem*)));
+    connection_edit_items.append(connection_edit_item);
 }
 
 void Editor::displayMapBorder() {
@@ -243,6 +504,7 @@ void Editor::displayMapBorder() {
         item->setY(y * 16);
         item->setZValue(-2);
         scene->addItem(item);
+        borderItems.append(item);
     }
 }
 
@@ -252,17 +514,213 @@ void Editor::displayMapGrid() {
     for (int i = 0; i <= map->getWidth(); i++) {
         int x = i * 16;
         QGraphicsLineItem *line = scene->addLine(x, 0, x, pixelHeight);
-        line->setVisible(gridToggleCheckbox->isChecked());
-        connect(gridToggleCheckbox, &QCheckBox::toggled, [=](bool checked){line->setVisible(checked);});
+        line->setVisible(ui->checkBox_ToggleGrid->isChecked());
+        connect(ui->checkBox_ToggleGrid, &QCheckBox::toggled, [=](bool checked){line->setVisible(checked);});
     }
     for (int j = 0; j <= map->getHeight(); j++) {
         int y = j * 16;
         QGraphicsLineItem *line = scene->addLine(0, y, pixelWidth, y);
-        line->setVisible(gridToggleCheckbox->isChecked());
-        connect(gridToggleCheckbox, &QCheckBox::toggled, [=](bool checked){line->setVisible(checked);});
+        line->setVisible(ui->checkBox_ToggleGrid->isChecked());
+        connect(ui->checkBox_ToggleGrid, &QCheckBox::toggled, [=](bool checked){line->setVisible(checked);});
     }
 }
 
+void Editor::updateConnectionOffset(int offset) {
+    if (!selected_connection_item)
+        return;
+
+    selected_connection_item->blockSignals(true);
+    offset = qMin(offset, selected_connection_item->getMaxOffset());
+    offset = qMax(offset, selected_connection_item->getMinOffset());
+    selected_connection_item->connection->offset = QString::number(offset);
+    if (selected_connection_item->connection->direction == "up" || selected_connection_item->connection->direction == "down") {
+        selected_connection_item->setX(selected_connection_item->initialX + (offset - selected_connection_item->initialOffset) * 16);
+    } else if (selected_connection_item->connection->direction == "left" || selected_connection_item->connection->direction == "right") {
+        selected_connection_item->setY(selected_connection_item->initialY + (offset - selected_connection_item->initialOffset) * 16);
+    }
+    selected_connection_item->blockSignals(false);
+    updateMirroredConnectionOffset(selected_connection_item->connection);
+}
+
+void Editor::setConnectionMap(QString mapName) {
+    if (!mapName.isEmpty() && !project->mapNames->contains(mapName)) {
+        qDebug() << "Invalid map name " << mapName << " specified for connection.";
+        return;
+    }
+    if (!selected_connection_item)
+        return;
+
+    if (mapName.isEmpty()) {
+        removeCurrentConnection();
+        return;
+    }
+
+    QString originalMapName = selected_connection_item->connection->map_name;
+    setConnectionEditControlsEnabled(true);
+    selected_connection_item->connection->map_name = mapName;
+    setCurrentConnectionDirection(selected_connection_item->connection->direction);
+    updateMirroredConnectionMap(selected_connection_item->connection, originalMapName);
+}
+
+void Editor::addNewConnection() {
+    // Find direction with least number of connections.
+    QMap<QString, int> directionCounts = QMap<QString, int>({{"up", 0}, {"right", 0}, {"down", 0}, {"left", 0}});
+    for (Connection* connection : map->connections) {
+        directionCounts[connection->direction]++;
+    }
+    QString minDirection = "up";
+    int minCount = INT_MAX;
+    for (QString direction : directionCounts.keys()) {
+        if (directionCounts[direction] < minCount) {
+            minDirection = direction;
+            minCount = directionCounts[direction];
+        }
+    }
+
+    // Don't connect the map to itself.
+    QString defaultMapName = project->mapNames->first();
+    if (defaultMapName == map->name) {
+        defaultMapName = project->mapNames->value(1);
+    }
+
+    Connection* newConnection = new Connection;
+    newConnection->direction = minDirection;
+    newConnection->offset = "0";
+    newConnection->map_name = defaultMapName;
+    map->connections.append(newConnection);
+    createConnectionItem(newConnection, true);
+    onConnectionItemSelected(connection_edit_items.last());
+    ui->label_NumConnections->setText(QString::number(map->connections.length()));
+
+    updateMirroredConnection(newConnection, newConnection->direction, newConnection->map_name);
+}
+
+void Editor::updateMirroredConnectionOffset(Connection* connection) {
+    updateMirroredConnection(connection, connection->direction, connection->map_name);
+}
+void Editor::updateMirroredConnectionDirection(Connection* connection, QString originalDirection) {
+    updateMirroredConnection(connection, originalDirection, connection->map_name);
+}
+void Editor::updateMirroredConnectionMap(Connection* connection, QString originalMapName) {
+    updateMirroredConnection(connection, connection->direction, originalMapName);
+}
+void Editor::removeMirroredConnection(Connection* connection) {
+    updateMirroredConnection(connection, connection->direction, connection->map_name, true);
+}
+void Editor::updateMirroredConnection(Connection* connection, QString originalDirection, QString originalMapName, bool isDelete) {
+    if (!ui->checkBox_MirrorConnections->isChecked())
+        return;
+
+    static QMap<QString, QString> oppositeDirections = QMap<QString, QString>({
+        {"up", "down"}, {"right", "left"},
+        {"down", "up"}, {"left", "right"},
+        {"dive", "emerge"},{"emerge", "dive"}});
+    QString oppositeDirection = oppositeDirections.value(originalDirection);
+
+    // Find the matching connection in the connected map.
+    QMap<QString, Map*> *mapcache = project->map_cache;
+    Connection* mirrorConnection = NULL;
+    Map* otherMap = project->getMap(originalMapName);
+    for (Connection* conn : otherMap->connections) {
+        if (conn->direction == oppositeDirection && conn->map_name == map->name) {
+            mirrorConnection = conn;
+        }
+    }
+
+    if (isDelete) {
+        if (mirrorConnection) {
+            otherMap->connections.removeOne(mirrorConnection);
+            delete mirrorConnection;
+        }
+        return;
+    }
+
+    if (connection->direction != originalDirection || connection->map_name != originalMapName) {
+        if (mirrorConnection) {
+            otherMap->connections.removeOne(mirrorConnection);
+            delete mirrorConnection;
+            mirrorConnection = NULL;
+            otherMap = project->getMap(connection->map_name);
+        }
+    }
+
+    // Create a new mirrored connection, if a matching one doesn't already exist.
+    if (!mirrorConnection) {
+        mirrorConnection = new Connection;
+        mirrorConnection->direction = oppositeDirections.value(connection->direction);
+        mirrorConnection->map_name = map->name;
+        otherMap->connections.append(mirrorConnection);
+    }
+
+    mirrorConnection->offset = QString::number(-connection->offset.toInt());
+}
+
+void Editor::removeCurrentConnection() {
+    if (!selected_connection_item)
+        return;
+
+    map->connections.removeOne(selected_connection_item->connection);
+    connection_edit_items.removeOne(selected_connection_item);
+    removeMirroredConnection(selected_connection_item->connection);
+
+    scene->removeItem(selected_connection_item);
+    delete selected_connection_item;
+    selected_connection_item = NULL;
+    setConnectionEditControlsEnabled(false);
+    ui->spinBox_ConnectionOffset->setValue(0);
+    ui->label_NumConnections->setText(QString::number(map->connections.length()));
+
+    if (connection_edit_items.length() > 0) {
+        onConnectionItemSelected(connection_edit_items.last());
+    }
+}
+
+void Editor::updateDiveMap(QString mapName) {
+    updateDiveEmergeMap(mapName, "dive");
+}
+
+void Editor::updateEmergeMap(QString mapName) {
+    updateDiveEmergeMap(mapName, "emerge");
+}
+
+void Editor::updateDiveEmergeMap(QString mapName, QString direction) {
+    if (!mapName.isEmpty() && !project->mapNamesToMapConstants->contains(mapName)) {
+        qDebug() << "Invalid " << direction << " map connection: " << mapName;
+        return;
+    }
+
+    Connection* connection = NULL;
+    for (Connection* conn : map->connections) {
+        if (conn->direction == direction) {
+            connection = conn;
+            break;
+        }
+    }
+
+    if (mapName.isEmpty()) {
+        // Remove dive/emerge connection
+        if (connection) {
+            map->connections.removeOne(connection);
+            removeMirroredConnection(connection);
+        }
+    } else {
+        if (!connection) {
+            connection = new Connection;
+            connection->direction = direction;
+            connection->offset = "0";
+            connection->map_name = mapName;
+            map->connections.append(connection);
+            updateMirroredConnection(connection, connection->direction, connection->map_name);
+        } else {
+            QString originalMapName = connection->map_name;
+            connection->map_name = mapName;
+            updateMirroredConnectionMap(connection, originalMapName);
+        }
+    }
+
+    ui->label_NumConnections->setText(QString::number(map->connections.length()));
+}
+
 void MetatilesPixmapItem::paintTileChanged(Map *map) {
     draw();
 }
@@ -363,6 +821,62 @@ void CollisionMetatilesPixmapItem::updateCurHoveredMetatile(QPointF pos) {
     }
 }
 
+int ConnectionPixmapItem::getMinOffset() {
+    if (connection->direction == "up" || connection->direction == "down")
+        return 1 - (this->pixmap().width() / 16);
+    else
+        return 1 - (this->pixmap().height() / 16);
+}
+int ConnectionPixmapItem::getMaxOffset() {
+    if (connection->direction == "up" || connection->direction == "down")
+        return baseMapWidth - 1;
+    else
+        return baseMapHeight - 1;
+}
+QVariant ConnectionPixmapItem::itemChange(GraphicsItemChange change, const QVariant &value)
+{
+    if (change == ItemPositionChange) {
+        QPointF newPos = value.toPointF();
+
+        qreal x, y;
+        int newOffset = initialOffset;
+        if (connection->direction == "up" || connection->direction == "down") {
+            x = round(newPos.x() / 16) * 16;
+            newOffset += (x - initialX) / 16;
+            newOffset = qMin(newOffset, this->getMaxOffset());
+            newOffset = qMax(newOffset, this->getMinOffset());
+            x = newOffset * 16;
+        }
+        else {
+            x = initialX;
+        }
+
+        if (connection->direction == "right" || connection->direction == "left") {
+            y = round(newPos.y() / 16) * 16;
+            newOffset += (y - initialY) / 16;
+            newOffset = qMin(newOffset, this->getMaxOffset());
+            newOffset = qMax(newOffset, this->getMinOffset());
+            y = newOffset * 16;
+        }
+        else {
+            y = initialY;
+        }
+
+        connection->offset = QString::number(newOffset);
+        emit connectionMoved(connection);
+        return QPointF(x, y);
+    }
+    else {
+        return QGraphicsItem::itemChange(change, value);
+    }
+}
+void ConnectionPixmapItem::mousePressEvent(QGraphicsSceneMouseEvent* event) {
+    emit connectionItemSelected(this);
+}
+void ConnectionPixmapItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent*) {
+    emit connectionItemDoubleClicked(this);
+}
+
 void ElevationMetatilesPixmapItem::updateCurHoveredMetatile(QPointF pos) {
     int x = ((int)pos.x()) / 16;
     int y = ((int)pos.y()) / 16;

editor.h

@@ -9,10 +9,12 @@
 #include <QCheckBox>
 
 #include "project.h"
+#include "ui_mainwindow.h"
 
 class DraggablePixmapItem;
 class MapPixmapItem;
 class CollisionPixmapItem;
+class ConnectionPixmapItem;
 class MetatilesPixmapItem;
 class CollisionMetatilesPixmapItem;
 class ElevationMetatilesPixmapItem;
@@ -21,12 +23,12 @@ class Editor : public QObject
 {
     Q_OBJECT
 public:
-    Editor();
+    Editor(Ui::MainWindow* ui);
 public:
+    Ui::MainWindow* ui;
     QObject *parent = NULL;
     Project *project = NULL;
     Map *map = NULL;
-    QCheckBox *gridToggleCheckbox = NULL;
     void saveProject();
     void save();
     void undo();
@@ -44,6 +46,17 @@ public:
     void setEditingMap();
     void setEditingCollision();
     void setEditingObjects();
+    void setEditingConnections();
+    void setCurrentConnectionDirection(QString curDirection);
+    void updateCurrentConnectionDirection(QString curDirection);
+    void setConnectionsVisibility(bool visible);
+    void updateConnectionOffset(int offset);
+    void setConnectionMap(QString mapName);
+    void addNewConnection();
+    void removeCurrentConnection();
+    void updateDiveMap(QString mapName);
+    void updateEmergeMap(QString mapName);
+    void setSelectedConnectionFromMap(QString mapName);
 
     DraggablePixmapItem *addMapObject(Event *event);
     void selectMapObject(DraggablePixmapItem *object);
@@ -58,8 +71,11 @@ public:
     QGraphicsScene *scene = NULL;
     QGraphicsPixmapItem *current_view = NULL;
     MapPixmapItem *map_item = NULL;
+    ConnectionPixmapItem* selected_connection_item = NULL;
+    QList<ConnectionPixmapItem*> connection_edit_items;
     CollisionPixmapItem *collision_item = NULL;
     QGraphicsItemGroup *objects_group = NULL;
+    QList<QGraphicsPixmapItem*> borderItems;
 
     QGraphicsScene *scene_metatiles = NULL;
     QGraphicsScene *scene_collision_metatiles = NULL;
@@ -77,13 +93,34 @@ public:
     void objectsView_onMouseMove(QMouseEvent *event);
     void objectsView_onMouseRelease(QMouseEvent *event);
 
+private:
+    void setConnectionItemsVisible(bool);
+    void setBorderItemsVisible(bool, qreal = 1);
+    void setConnectionEditControlValues(Connection*);
+    void setConnectionEditControlsEnabled(bool);
+    void createConnectionItem(Connection* connection, bool hide);
+    void populateConnectionMapPickers();
+    void setDiveEmergeControls();
+    void updateDiveEmergeMap(QString mapName, QString direction);
+    void onConnectionOffsetChanged(int newOffset);
+    void removeMirroredConnection(Connection*);
+    void updateMirroredConnectionOffset(Connection*);
+    void updateMirroredConnectionDirection(Connection*, QString);
+    void updateMirroredConnectionMap(Connection*, QString);
+    void updateMirroredConnection(Connection*, QString, QString, bool isDelete = false);
+
 private slots:
     void mouseEvent_map(QGraphicsSceneMouseEvent *event, MapPixmapItem *item);
     void mouseEvent_collision(QGraphicsSceneMouseEvent *event, CollisionPixmapItem *item);
+    void onConnectionMoved(Connection*);
+    void onConnectionItemSelected(ConnectionPixmapItem* connectionItem);
+    void onConnectionItemDoubleClicked(ConnectionPixmapItem* connectionItem);
+    void onConnectionDirectionChanged(QString newDirection);
 
 signals:
     void objectsChanged();
     void selectedObjectsChanged();
+    void loadMapRequested(QString, QString);
 };
 
 
@@ -240,6 +277,49 @@ protected:
     void mouseReleaseEvent(QGraphicsSceneMouseEvent*);
 };
 
+class ConnectionPixmapItem : public QObject, public QGraphicsPixmapItem {
+    Q_OBJECT
+public:
+    ConnectionPixmapItem(QPixmap pixmap, Connection* connection, int x, int y, int baseMapWidth, int baseMapHeight): QGraphicsPixmapItem(pixmap) {
+        this->basePixmap = pixmap;
+        this->connection = connection;
+        setFlag(ItemIsMovable);
+        setFlag(ItemSendsGeometryChanges);
+        this->initialX = x;
+        this->initialY = y;
+        this->initialOffset = connection->offset.toInt();
+        this->baseMapWidth = baseMapWidth;
+        this->baseMapHeight = baseMapHeight;
+    }
+    void render(qreal opacity = 1) {
+        QPixmap newPixmap = basePixmap.copy(0, 0, basePixmap.width(), basePixmap.height());
+        if (opacity < 1) {
+            QPainter painter(&newPixmap);
+            int alpha = (int)(255 * (1 - opacity));
+            painter.fillRect(0, 0, newPixmap.width(), newPixmap.height(), QColor(0, 0, 0, alpha));
+            painter.end();
+        }
+        this->setPixmap(newPixmap);
+    }
+    int getMinOffset();
+    int getMaxOffset();
+    QPixmap basePixmap;
+    Connection* connection;
+    int initialX;
+    int initialY;
+    int initialOffset;
+    int baseMapWidth;
+    int baseMapHeight;
+protected:
+    QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+    void mousePressEvent(QGraphicsSceneMouseEvent*);
+    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent*);
+signals:
+    void connectionItemSelected(ConnectionPixmapItem* connectionItem);
+    void connectionItemDoubleClicked(ConnectionPixmapItem* connectionItem);
+    void connectionMoved(Connection*);
+};
+
 class MetatilesPixmapItem : public QObject, public QGraphicsPixmapItem {
     Q_OBJECT
 public:

graphicsview.cpp

@@ -1,4 +1,5 @@
 #include "graphicsview.h"
+#include "editor.h"
 
 void GraphicsView::mousePressEvent(QMouseEvent *event) {
     QGraphicsView::mousePressEvent(event);

graphicsview.h

@@ -4,7 +4,7 @@
 #include <QGraphicsView>
 #include <QMouseEvent>
 
-#include "editor.h"
+class Editor;
 
 /*
 class GraphicsView_Object : public QObject
@@ -26,7 +26,7 @@ public:
 
 public:
 //    GraphicsView_Object object;
-    Editor *editor = NULL;
+    Editor *editor;
 protected:
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);

mainwindow.cpp

@@ -26,10 +26,10 @@ MainWindow::MainWindow(QWidget *parent) :
     ui->setupUi(this);
     new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_Z), this, SLOT(redo()));
 
-    editor = new Editor;
-    editor->gridToggleCheckbox = ui->checkBox_ToggleGrid;
+    editor = new Editor(ui);
     connect(editor, SIGNAL(objectsChanged()), this, SLOT(updateSelectedObjects()));
     connect(editor, SIGNAL(selectedObjectsChanged()), this, SLOT(updateSelectedObjects()));
+    connect(editor, SIGNAL(loadMapRequested(QString, QString)), this, SLOT(onLoadMapRequested(QString, QString)));
 
     on_toolButton_Paint_clicked();
 
@@ -143,15 +143,7 @@ void MainWindow::setMap(QString map_name) {
     }
     editor->setMap(map_name);
 
-    if (ui->tabWidget->currentIndex() == 1) {
-        editor->setEditingObjects();
-    } else {
-        if (ui->tabWidget_2->currentIndex() == 1) {
-            editor->setEditingCollision();
-        } else {
-            editor->setEditingMap();
-        }
-    }
+    on_tabWidget_currentChanged(ui->tabWidget->currentIndex());
 
     ui->graphicsView_Map->setScene(editor->scene);
     ui->graphicsView_Map->setSceneRect(editor->scene->sceneRect());
@@ -162,6 +154,10 @@ void MainWindow::setMap(QString map_name) {
     ui->graphicsView_Objects_Map->setFixedSize(editor->scene->width() + 2, editor->scene->height() + 2);
     ui->graphicsView_Objects_Map->editor = editor;
 
+    ui->graphicsView_Connections->setScene(editor->scene);
+    ui->graphicsView_Connections->setSceneRect(editor->scene->sceneRect());
+    ui->graphicsView_Connections->setFixedSize(editor->scene->width() + 2, editor->scene->height() + 2);
+
     ui->graphicsView_Metatiles->setScene(editor->scene_metatiles);
     //ui->graphicsView_Metatiles->setSceneRect(editor->scene_metatiles->sceneRect());
     ui->graphicsView_Metatiles->setFixedSize(editor->metatiles_item->pixmap().width() + 2, editor->metatiles_item->pixmap().height() + 2);
@@ -294,6 +290,7 @@ void MainWindow::loadDataStructures() {
     project->readItemNames();
     project->readFlagNames();
     project->readVarNames();
+    project->readMapsWithConnections();
 }
 
 void MainWindow::populateMapList() {
@@ -491,6 +488,8 @@ void MainWindow::on_tabWidget_currentChanged(int index)
         on_tabWidget_2_currentChanged(ui->tabWidget_2->currentIndex());
     } else if (index == 1) {
         editor->setEditingObjects();
+    } else if (index == 3) {
+        editor->setEditingConnections();
     }
 }
 
@@ -756,6 +755,11 @@ void MainWindow::checkToolButtons() {
     ui->toolButton_Dropper->setChecked(editor->map_edit_mode == "pick");
 }
 
+void MainWindow::onLoadMapRequested(QString mapName, QString fromMapName) {
+    setMap(mapName);
+    editor->setSelectedConnectionFromMap(fromMapName);
+}
+
 void MainWindow::onMapChanged(Map *map) {
     updateMapList();
 }
@@ -768,3 +772,38 @@ void MainWindow::on_action_Export_Map_Image_triggered()
         editor->map_item->pixmap().save(filepath);
     }
 }
+
+void MainWindow::on_comboBox_ConnectionDirection_currentIndexChanged(const QString &direction)
+{
+    editor->updateCurrentConnectionDirection(direction);
+}
+
+void MainWindow::on_spinBox_ConnectionOffset_valueChanged(int offset)
+{
+    editor->updateConnectionOffset(offset);
+}
+
+void MainWindow::on_comboBox_ConnectedMap_currentTextChanged(const QString &mapName)
+{
+    editor->setConnectionMap(mapName);
+}
+
+void MainWindow::on_pushButton_AddConnection_clicked()
+{
+    editor->addNewConnection();
+}
+
+void MainWindow::on_pushButton_RemoveConnection_clicked()
+{
+    editor->removeCurrentConnection();
+}
+
+void MainWindow::on_comboBox_DiveMap_currentTextChanged(const QString &mapName)
+{
+    editor->updateDiveMap(mapName);
+}
+
+void MainWindow::on_comboBox_EmergeMap_currentTextChanged(const QString &mapName)
+{
+    editor->updateEmergeMap(mapName);
+}

mainwindow.h

@@ -36,6 +36,7 @@ private slots:
     void undo();
     void redo();
 
+    void onLoadMapRequested(QString, QString);
     void onMapChanged(Map *map);
 
     void on_action_Save_triggered();
@@ -74,6 +75,20 @@ private slots:
 
     void on_action_Export_Map_Image_triggered();
 
+    void on_comboBox_ConnectionDirection_currentIndexChanged(const QString &arg1);
+
+    void on_spinBox_ConnectionOffset_valueChanged(int offset);
+
+    void on_comboBox_ConnectedMap_currentTextChanged(const QString &mapName);
+
+    void on_pushButton_AddConnection_clicked();
+
+    void on_pushButton_RemoveConnection_clicked();
+
+    void on_comboBox_DiveMap_currentTextChanged(const QString &mapName);
+
+    void on_comboBox_EmergeMap_currentTextChanged(const QString &mapName);
+
 private:
     Ui::MainWindow *ui;
     QStandardItemModel *mapListModel;

mainwindow.ui

@@ -1199,6 +1199,500 @@
          </widget>
         </widget>
        </widget>
+       <widget class="QWidget" name="tab_Connections">
+        <attribute name="title">
+         <string>Connections</string>
+        </attribute>
+        <layout class="QGridLayout" name="gridLayout_12">
+         <property name="leftMargin">
+          <number>0</number>
+         </property>
+         <property name="topMargin">
+          <number>0</number>
+         </property>
+         <property name="rightMargin">
+          <number>0</number>
+         </property>
+         <property name="bottomMargin">
+          <number>0</number>
+         </property>
+         <item row="3" column="0">
+          <widget class="QFrame" name="gridFrame">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="frameShape">
+            <enum>QFrame::StyledPanel</enum>
+           </property>
+           <property name="frameShadow">
+            <enum>QFrame::Raised</enum>
+           </property>
+           <layout class="QGridLayout" name="gridLayout_11">
+            <property name="leftMargin">
+             <number>0</number>
+            </property>
+            <property name="topMargin">
+             <number>0</number>
+            </property>
+            <property name="rightMargin">
+             <number>0</number>
+            </property>
+            <property name="bottomMargin">
+             <number>0</number>
+            </property>
+            <property name="spacing">
+             <number>0</number>
+            </property>
+            <item row="1" column="0">
+             <widget class="QFrame" name="horizontalFrame">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="minimumSize">
+               <size>
+                <width>0</width>
+                <height>32</height>
+               </size>
+              </property>
+              <property name="frameShape">
+               <enum>QFrame::StyledPanel</enum>
+              </property>
+              <property name="frameShadow">
+               <enum>QFrame::Raised</enum>
+              </property>
+              <layout class="QHBoxLayout" name="horizontalLayout_4">
+               <property name="spacing">
+                <number>4</number>
+               </property>
+               <property name="leftMargin">
+                <number>4</number>
+               </property>
+               <property name="topMargin">
+                <number>4</number>
+               </property>
+               <property name="rightMargin">
+                <number>4</number>
+               </property>
+               <property name="bottomMargin">
+                <number>4</number>
+               </property>
+               <item>
+                <widget class="QPushButton" name="pushButton_AddConnection">
+                 <property name="sizePolicy">
+                  <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+                   <horstretch>0</horstretch>
+                   <verstretch>0</verstretch>
+                  </sizepolicy>
+                 </property>
+                 <property name="text">
+                  <string/>
+                 </property>
+                 <property name="icon">
+                  <iconset>
+                   <activeon>:/icons/add.ico</activeon>
+                  </iconset>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QPushButton" name="pushButton_RemoveConnection">
+                 <property name="text">
+                  <string/>
+                 </property>
+                 <property name="icon">
+                  <iconset>
+                   <activeon>:/icons/delete.ico</activeon>
+                  </iconset>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QLabel" name="label_13">
+                 <property name="text">
+                  <string>Number of Connections:</string>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QLabel" name="label_NumConnections">
+                 <property name="text">
+                  <string/>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <spacer name="horizontalSpacer_11">
+                 <property name="orientation">
+                  <enum>Qt::Horizontal</enum>
+                 </property>
+                 <property name="sizeType">
+                  <enum>QSizePolicy::Maximum</enum>
+                 </property>
+                 <property name="sizeHint" stdset="0">
+                  <size>
+                   <width>40</width>
+                   <height>20</height>
+                  </size>
+                 </property>
+                </spacer>
+               </item>
+               <item>
+                <widget class="QCheckBox" name="checkBox_MirrorConnections">
+                 <property name="sizePolicy">
+                  <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+                   <horstretch>0</horstretch>
+                   <verstretch>0</verstretch>
+                  </sizepolicy>
+                 </property>
+                 <property name="text">
+                  <string>Mirror</string>
+                 </property>
+                 <property name="checked">
+                  <bool>true</bool>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <spacer name="horizontalSpacer_9">
+                 <property name="orientation">
+                  <enum>Qt::Horizontal</enum>
+                 </property>
+                 <property name="sizeHint" stdset="0">
+                  <size>
+                   <width>40</width>
+                   <height>20</height>
+                  </size>
+                 </property>
+                </spacer>
+               </item>
+              </layout>
+             </widget>
+            </item>
+            <item row="2" column="0">
+             <widget class="QFrame" name="horizontalFrame">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="minimumSize">
+               <size>
+                <width>0</width>
+                <height>32</height>
+               </size>
+              </property>
+              <property name="frameShape">
+               <enum>QFrame::StyledPanel</enum>
+              </property>
+              <property name="frameShadow">
+               <enum>QFrame::Raised</enum>
+              </property>
+              <layout class="QHBoxLayout" name="horizontalLayout_3" stretch="0,0,0,0,0,0,0">
+               <property name="spacing">
+                <number>4</number>
+               </property>
+               <property name="leftMargin">
+                <number>4</number>
+               </property>
+               <property name="topMargin">
+                <number>4</number>
+               </property>
+               <property name="rightMargin">
+                <number>4</number>
+               </property>
+               <property name="bottomMargin">
+                <number>4</number>
+               </property>
+               <item>
+                <widget class="QComboBox" name="comboBox_ConnectionDirection">
+                 <item>
+                  <property name="text">
+                   <string>up</string>
+                  </property>
+                 </item>
+                 <item>
+                  <property name="text">
+                   <string>right</string>
+                  </property>
+                 </item>
+                 <item>
+                  <property name="text">
+                   <string>down</string>
+                  </property>
+                 </item>
+                 <item>
+                  <property name="text">
+                   <string>left</string>
+                  </property>
+                 </item>
+                </widget>
+               </item>
+               <item>
+                <spacer name="horizontalSpacer_2">
+                 <property name="orientation">
+                  <enum>Qt::Horizontal</enum>
+                 </property>
+                 <property name="sizeType">
+                  <enum>QSizePolicy::Fixed</enum>
+                 </property>
+                 <property name="sizeHint" stdset="0">
+                  <size>
+                   <width>20</width>
+                   <height>20</height>
+                  </size>
+                 </property>
+                </spacer>
+               </item>
+               <item>
+                <widget class="QLabel" name="label_11">
+                 <property name="text">
+                  <string>Map</string>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QComboBox" name="comboBox_ConnectedMap">
+                 <property name="editable">
+                  <bool>true</bool>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QLabel" name="label_12">
+                 <property name="text">
+                  <string>Offset</string>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QSpinBox" name="spinBox_ConnectionOffset">
+                 <property name="minimum">
+                  <number>-999</number>
+                 </property>
+                 <property name="maximum">
+                  <number>999</number>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <spacer name="horizontalSpacer_6">
+                 <property name="orientation">
+                  <enum>Qt::Horizontal</enum>
+                 </property>
+                 <property name="sizeHint" stdset="0">
+                  <size>
+                   <width>40</width>
+                   <height>20</height>
+                  </size>
+                 </property>
+                </spacer>
+               </item>
+              </layout>
+             </widget>
+            </item>
+            <item row="3" column="0">
+             <widget class="QFrame" name="gridFrame">
+              <property name="frameShape">
+               <enum>QFrame::StyledPanel</enum>
+              </property>
+              <property name="frameShadow">
+               <enum>QFrame::Raised</enum>
+              </property>
+              <layout class="QGridLayout" name="gridLayout_13">
+               <property name="leftMargin">
+                <number>0</number>
+               </property>
+               <property name="topMargin">
+                <number>0</number>
+               </property>
+               <property name="rightMargin">
+                <number>0</number>
+               </property>
+               <property name="bottomMargin">
+                <number>0</number>
+               </property>
+               <property name="spacing">
+                <number>0</number>
+               </property>
+               <item row="1" column="0">
+                <widget class="QScrollArea" name="scrollArea_5">
+                 <property name="sizePolicy">
+                  <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+                   <horstretch>1</horstretch>
+                   <verstretch>0</verstretch>
+                  </sizepolicy>
+                 </property>
+                 <property name="widgetResizable">
+                  <bool>true</bool>
+                 </property>
+                 <widget class="QWidget" name="scrollAreaWidgetContents_3">
+                  <property name="geometry">
+                   <rect>
+                    <x>0</x>
+                    <y>0</y>
+                    <width>826</width>
+                    <height>557</height>
+                   </rect>
+                  </property>
+                  <layout class="QGridLayout" name="gridLayout_14">
+                   <item row="1" column="2">
+                    <spacer name="horizontalSpacer_8">
+                     <property name="orientation">
+                      <enum>Qt::Horizontal</enum>
+                     </property>
+                     <property name="sizeHint" stdset="0">
+                      <size>
+                       <width>40</width>
+                       <height>20</height>
+                      </size>
+                     </property>
+                    </spacer>
+                   </item>
+                   <item row="2" column="1">
+                    <spacer name="verticalSpacer_2">
+                     <property name="orientation">
+                      <enum>Qt::Vertical</enum>
+                     </property>
+                     <property name="sizeHint" stdset="0">
+                      <size>
+                       <width>20</width>
+                       <height>40</height>
+                      </size>
+                     </property>
+                    </spacer>
+                   </item>
+                   <item row="0" column="1">
+                    <spacer name="verticalSpacer">
+                     <property name="orientation">
+                      <enum>Qt::Vertical</enum>
+                     </property>
+                     <property name="sizeHint" stdset="0">
+                      <size>
+                       <width>20</width>
+                       <height>40</height>
+                      </size>
+                     </property>
+                    </spacer>
+                   </item>
+                   <item row="1" column="1">
+                    <widget class="QGraphicsView" name="graphicsView_Connections">
+                     <property name="backgroundBrush">
+                      <brush brushstyle="SolidPattern">
+                       <color alpha="255">
+                        <red>0</red>
+                        <green>0</green>
+                        <blue>0</blue>
+                       </color>
+                      </brush>
+                     </property>
+                    </widget>
+                   </item>
+                   <item row="1" column="0">
+                    <spacer name="horizontalSpacer_7">
+                     <property name="orientation">
+                      <enum>Qt::Horizontal</enum>
+                     </property>
+                     <property name="sizeHint" stdset="0">
+                      <size>
+                       <width>40</width>
+                       <height>20</height>
+                      </size>
+                     </property>
+                    </spacer>
+                   </item>
+                  </layout>
+                 </widget>
+                </widget>
+               </item>
+               <item row="0" column="0">
+                <widget class="QFrame" name="horizontalFrame">
+                 <property name="sizePolicy">
+                  <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+                   <horstretch>0</horstretch>
+                   <verstretch>0</verstretch>
+                  </sizepolicy>
+                 </property>
+                 <property name="frameShape">
+                  <enum>QFrame::StyledPanel</enum>
+                 </property>
+                 <property name="frameShadow">
+                  <enum>QFrame::Raised</enum>
+                 </property>
+                 <layout class="QHBoxLayout" name="horizontalLayout_6">
+                  <property name="spacing">
+                   <number>4</number>
+                  </property>
+                  <property name="leftMargin">
+                   <number>4</number>
+                  </property>
+                  <property name="topMargin">
+                   <number>4</number>
+                  </property>
+                  <property name="rightMargin">
+                   <number>4</number>
+                  </property>
+                  <property name="bottomMargin">
+                   <number>4</number>
+                  </property>
+                  <item>
+                   <widget class="QLabel" name="label_14">
+                    <property name="text">
+                     <string>Dive Map</string>
+                    </property>
+                   </widget>
+                  </item>
+                  <item>
+                   <widget class="QComboBox" name="comboBox_DiveMap">
+                    <property name="editable">
+                     <bool>true</bool>
+                    </property>
+                   </widget>
+                  </item>
+                  <item>
+                   <widget class="QLabel" name="label_15">
+                    <property name="text">
+                     <string>Emerge Map</string>
+                    </property>
+                   </widget>
+                  </item>
+                  <item>
+                   <widget class="QComboBox" name="comboBox_EmergeMap">
+                    <property name="editable">
+                     <bool>true</bool>
+                    </property>
+                   </widget>
+                  </item>
+                  <item>
+                   <spacer name="horizontalSpacer_10">
+                    <property name="orientation">
+                     <enum>Qt::Horizontal</enum>
+                    </property>
+                    <property name="sizeHint" stdset="0">
+                     <size>
+                      <width>40</width>
+                      <height>20</height>
+                     </size>
+                    </property>
+                   </spacer>
+                  </item>
+                 </layout>
+                </widget>
+               </item>
+              </layout>
+             </widget>
+            </item>
+           </layout>
+          </widget>
+         </item>
+        </layout>
+       </widget>
       </widget>
      </widget>
     </item>

map.h

@@ -8,6 +8,7 @@
 #include <QPixmap>
 #include <QObject>
 #include <QDebug>
+#include <QGraphicsPixmapItem>
 
 
 template <typename T>
@@ -181,6 +182,7 @@ public:
     QMap<QString, QList<Event*>> events;
 
     QList<Connection*> connections;
+    QList<QGraphicsPixmapItem*> connection_items;
     QPixmap renderConnection(Connection);
 
     QImage border_image;

parseutil.h

@@ -3,6 +3,7 @@
 
 #include <QString>
 #include <QList>
+#include <QMap>
 
 enum TokenType {
     Number,

project.cpp

@@ -39,7 +39,8 @@ Map* Project::loadMap(QString map_name) {
     Map *map;
     if (map_cache->contains(map_name)) {
         map = map_cache->value(map_name);
-        if (map->hasUnsavedChanges()) {
+        // TODO: uncomment when undo/redo history is fully implemented for all actions.
+        if (true/*map->hasUnsavedChanges()*/) {
             return map;
         }
     } else {
@@ -67,6 +68,7 @@ void Project::loadMapConnections(Map *map) {
     }
 
     map->connections.clear();
+    map->connection_items.clear();
     if (!map->connections_label.isNull()) {
         QString path = root + QString("/data/maps/%1/connections.inc").arg(map->name);
         QString text = readTextFile(path);
@@ -196,7 +198,14 @@ void Project::saveMapHeader(Map *map) {
     text += QString("\t.4byte %1\n").arg(map->attributes_label);
     text += QString("\t.4byte %1\n").arg(map->events_label);
     text += QString("\t.4byte %1\n").arg(map->scripts_label);
+
+    if (map->connections.length() == 0) {
+        map->connections_label = "0x0";
+    } else {
+        map->connections_label = QString("%1_MapConnections").arg(map->name);
+    }
     text += QString("\t.4byte %1\n").arg(map->connections_label);
+
     text += QString("\t.2byte %1\n").arg(map->song);
     text += QString("\t.2byte %1\n").arg(map->index);
     text += QString("\t.byte %1\n").arg(map->location);
@@ -209,6 +218,48 @@ void Project::saveMapHeader(Map *map) {
     saveTextFile(header_path, text);
 }
 
+void Project::saveMapConnections(Map *map) {
+    QString path = root + "/data/maps/" + map->name + "/connections.inc";
+    if (map->connections.length() > 0) {
+        QString text = "";
+        QString connectionsListLabel = QString("%1_MapConnectionsList").arg(map->name);
+        int numValidConnections = 0;
+        text += QString("%1::\n").arg(connectionsListLabel);
+        for (Connection* connection : map->connections) {
+            if (mapNamesToMapConstants->contains(connection->map_name)) {
+                text += QString("\tconnection %1, %2, %3\n")
+                        .arg(connection->direction)
+                        .arg(connection->offset)
+                        .arg(mapNamesToMapConstants->value(connection->map_name));
+                numValidConnections++;
+            } else {
+                qDebug() << QString("Failed to write map connection. %1 not a valid map name").arg(connection->map_name);
+            }
+        }
+        text += QString("\n");
+        text += QString("%1::\n").arg(map->connections_label);
+        text += QString("\t.4byte %1\n").arg(numValidConnections);
+        text += QString("\t.4byte %1\n").arg(connectionsListLabel);
+        saveTextFile(path, text);
+    } else {
+        deleteFile(path);
+    }
+
+    updateMapsWithConnections(map);
+}
+
+void Project::updateMapsWithConnections(Map *map) {
+    if (map->connections.length() > 0) {
+        if (!mapsWithConnections.contains(map->name)) {
+            mapsWithConnections.append(map->name);
+        }
+    } else {
+        if (mapsWithConnections.contains(map->name)) {
+            mapsWithConnections.removeOne(map->name);
+        }
+    }
+}
+
 void Project::readMapAttributesTable() {
     int curMapIndex = 1;
     QString attributesText = readTextFile(getMapAttributesTableFilepath());
@@ -679,6 +730,7 @@ void Project::saveMap(Map *map) {
 
     saveMapBorder(map);
     saveMapHeader(map);
+    saveMapConnections(map);
     saveBlockdata(map);
     saveMapEvents(map);
 
@@ -689,7 +741,9 @@ void Project::saveMap(Map *map) {
 }
 
 void Project::updateMapAttributes(Map* map) {
-    mapAttributesTableMaster.insert(map->index.toInt(nullptr, 0), map->name);
+    if (!mapAttributesTableMaster.contains(map->index.toInt())) {
+        mapAttributesTableMaster.insert(map->index.toInt(), map->name);
+    }
 
     // Deep copy
     QMap<QString, QString> attrs = mapAttributes.value(map->name);
@@ -702,6 +756,7 @@ void Project::saveAllDataStructures() {
     saveAllMapAttributes();
     saveMapGroupsTable();
     saveMapConstantsHeader();
+    saveMapsWithConnections();
 }
 
 void Project::loadTilesetAssets(Tileset* tileset) {
@@ -913,6 +968,13 @@ void Project::appendTextFile(QString path, QString text) {
     }
 }
 
+void Project::deleteFile(QString path) {
+    QFile file(path);
+    if (file.exists() && !file.remove()) {
+        qDebug() << QString("Could not delete file '%1': ").arg(path) + file.errorString();
+    }
+}
+
 void Project::readMapGroups() {
     QString text = readTextFile(root + "/data/maps/_groups.inc");
     if (text.isNull()) {
@@ -1098,6 +1160,41 @@ void Project::readCDefinesSorted(QString filepath, QStringList prefixes, QString
     }
 }
 
+void Project::readMapsWithConnections() {
+    QString path = root + "/data/maps/connections.inc";
+    QString text = readTextFile(path);
+    if (text.isNull()) {
+        return;
+    }
+
+    mapsWithConnections.clear();
+    QRegularExpression re("data\\/maps\\/(?<mapName>\\w+)\\/connections.inc");
+    QList<QStringList>* includes = parseAsm(text);
+    for (QStringList values : *includes) {
+        if (values.length() != 2)
+            continue;
+
+        QRegularExpressionMatch match = re.match(values.value(1));
+        if (match.hasMatch()) {
+            QString mapName = match.captured("mapName");
+            mapsWithConnections.append(mapName);
+        }
+    }
+}
+
+void Project::saveMapsWithConnections() {
+    QString path = root + "/data/maps/connections.inc";
+    QString text = "";
+    for (QString mapName : mapsWithConnections) {
+        if (mapNamesToMapConstants->contains(mapName)) {
+            text += QString("\t.include \"data/maps/%1/connections.inc\"\n").arg(mapName);
+        } else {
+            qDebug() << QString("Failed to write connection include. %1 not a valid map name").arg(mapName);
+        }
+    }
+    saveTextFile(path, text);
+}
+
 QStringList Project::getSongNames() {
     QStringList names;
     QString text = readTextFile(root + "/include/constants/songs.h");
@@ -1164,7 +1261,6 @@ void Project::loadObjectPixmaps(QList<Event*> objects) {
         }
 
         if (event_type == "object") {
-
             int sprite_id = constants.value(object->get("sprite"));
 
             QString info_label = pointers.value(sprite_id).replace("&", "");

project.h

@@ -26,6 +26,7 @@ public:
     QStringList *itemNames = NULL;
     QStringList *flagNames = NULL;
     QStringList *varNames = NULL;
+    QStringList mapsWithConnections;
 
     QMap<QString, Map*> *map_cache;
     Map* loadMap(QString);
@@ -41,6 +42,7 @@ public:
     QString readTextFile(QString path);
     void saveTextFile(QString path, QString text);
     void appendTextFile(QString path, QString text);
+    void deleteFile(QString path);
 
     void readMapGroups();
     Map* addNewMapToGroup(QString mapName, int groupNum);
@@ -53,6 +55,7 @@ public:
     void readMapAttributesTable();
     void readAllMapAttributes();
     void readMapAttributes(Map*);
+    void readMapsWithConnections();
     void getTilesets(Map*);
     void loadTilesetAssets(Tileset*);
 
@@ -97,6 +100,9 @@ private:
     QString getMapAttributesTableFilepath();
     QString getMapAssetsFilepath();
     void saveMapHeader(Map*);
+    void saveMapConnections(Map*);
+    void updateMapsWithConnections(Map*);
+    void saveMapsWithConnections();
     void saveMapAttributesTable();
     void updateMapAttributes(Map* map);
     void readCDefinesSorted(QString, QStringList, QStringList*);