Graph/graphwidget.cpp at main · seva-sanko/Graph · GitHub

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#include "graphwidget.h"
#include "graphnode.h"
#include "graphedge.h"
#include <QGraphicsScene>
#include <QMouseEvent>
#include <QWheelEvent>
#include <QDebug>


GraphWidget::GraphWidget(QWidget* parent) :
    QGraphicsView(parent),
    scene(new QGraphicsScene(this)),
    graph(nullptr),
    timer(new QTimer(this))
{
    setScene(scene);
    setRenderHint(QPainter::Antialiasing);
    setDragMode(QGraphicsView::NoDrag);
    setInteractive(true);
}

GraphWidget::~GraphWidget() {
    clearGraph();
    delete scene;
}

void GraphWidget::setGraph(Graph* newGraph) {
    clearGraph();
    graph = newGraph;
    drawGraph();

    for (QGraphicsItem* item : scene->items()) {
           if (GraphEdge* edge = dynamic_cast<GraphEdge*>(item)) {
               edge->update();
           }
    }
}

void GraphWidget::clearGraph() {

    for (GraphNode* node : nodes) {
        delete node;
    }
    nodes.clear();
    scene->clear();
}

const Graph* GraphWidget::getGraph() const {
    return graph;
}

void GraphWidget::drawGraph() {
    if (!graph) return;

    const int vertexCount = graph->getRows();
    const double radius = 200;
    const double centerX = 300;
    const double centerY = 300;


    for (int i = 0; i < vertexCount; ++i) {
        double angle = 2 * M_PI * i / vertexCount;
        double x = centerX + radius * cos(angle);
        double y = centerY + radius * sin(angle);

        GraphNode* node = new GraphNode(i);
        node->setPos(x, y);
        node->setFlag(QGraphicsItem::ItemIsMovable);
        node->setFlag(QGraphicsItem::ItemSendsGeometryChanges);
        node->setZValue(1);
        scene->addItem(node);
        nodes.append(node);
    }

    bool isDirected = graph->isDirected();
    for (int i = 0; i < vertexCount; ++i) {
            for (int j = 0; j < vertexCount; ++j) {
                if (graph->get(i, j)) {
                    GraphEdge* edge = new GraphEdge(nodes[i], nodes[j], graph->get(i, j), isDirected);
                    scene->addItem(edge);
                }
            }
        }
}


void GraphWidget::mousePressEvent(QMouseEvent *event) {
    QGraphicsItem *item = itemAt(event->pos());
    if (item) {
        selectedNode = qgraphicsitem_cast<GraphNode*>(item);
        if (selectedNode) {
            qDebug() << "Node selected: ID =" << selectedNode->getId();
            maxZValue += 1;
            selectedNode->setZValue(maxZValue);
            emit nodeSelected(selectedNode->getId());
        }
    } else {
        selectedNode = nullptr;
    }

    QGraphicsView::mousePressEvent(event);
}

void GraphWidget::mouseMoveEvent(QMouseEvent *event) {
    if (selectedNode && (event->buttons() & Qt::LeftButton)) {
        selectedNode->setPos(mapToScene(event->pos()));


        QList<QGraphicsItem*> items = scene->items();
        for (QGraphicsItem* item : items) {
            if (GraphEdge* edge = dynamic_cast<GraphEdge*>(item)) {
                if (edge->sourceNode() == selectedNode || edge->destNode() == selectedNode) {
                    edge->updatePosition();
                }
            }
        }

        emit nodeMoved(selectedNode->getId(), selectedNode->pos());
    }

    QGraphicsView::mouseMoveEvent(event);
}

void GraphWidget::mouseReleaseEvent(QMouseEvent *event) {
    selectedNode = nullptr;
    QGraphicsView::mouseReleaseEvent(event);
}