Function main

samples/cpp/cpp_sample.cpp:122–182

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//-----------------------------------------------------------------------------
int	main( int argc, char** argv )
{
    QGuiApplication app(argc, argv);
    QQuickStyle::setStyle("Material");
    QQmlApplicationEngine engine;
    engine.addImportPath("../../src/");
    QuickQanava::initialize(&engine);

    qmlRegisterType<CustomGroup>("MyModule", 1, 0, "CustomGroup");
    qmlRegisterType<CustomNode>("MyModule", 1, 0, "CustomNode");
    qmlRegisterType<CustomGraph>("MyModule", 1, 0, "CustomGraph");
    qmlRegisterType<CustomEdge>("MyModule", 1, 0, "AbstractCustomEdge");

    engine.load(QUrl("qrc:/cpp_sample.qml"));

    { // We can here customize QuickQanava graph topology _synchronously_ before the
      // Qt/QML event loop starts
        QPointer<CustomGraph> graph = nullptr;
        for (const auto rootObject : engine.rootObjects()) {
            graph = qobject_cast<CustomGraph*>(rootObject->findChild<QQuickItem *>("graph"));
            if (graph)
                break;
        }

        if (graph) {
            static constexpr qreal defaultWidth{40.}, defaultHeight{30.};
            static constexpr qreal xSpacing{50.}, ySpacing{30.};

            static constexpr int array_size = 3;
            qan::Node* nodes[array_size][array_size];
            for (int r = 0; r < array_size; r++) {
                qreal nodeX = r * (defaultWidth + 2 * xSpacing );
                for (int c = 0; c < array_size; c++) {
                    qreal nodeY = c * (defaultHeight + 2 * ySpacing);
                    auto node = graph->insertCustomNode();
                    node->getItem()->setMinimumSize({defaultWidth / 2., defaultHeight / 2.});
                    node->getItem()->setRect({nodeX, nodeY, defaultWidth, defaultHeight});
                    // Equivalent to:
                        //node->getItem()->setX(nodeX);
                        //node->getItem()->setY(nodeY);
                        //node->getItem()->setWidth(defaultWidth);
                        //node->getItem()->setHeight(defaultHeight);
                        //node->setLabel(QString::number(n++));
                    nodes[r][c] = node;
                } // for columns
            } // for rows
            auto group = graph->insertCustomGroup();
            group->getItem()->setRect({300, 200, 400, 250});

            // Grouping nodes from c++
            graph->groupNode(group, nodes[0][0], nullptr, false);

            // NOTE: If the node is already on top of the group were we want to insert node, use transformPosition=true
            // to convert node position from graphview coordinate system to group coordinate system.
            // If the transformPosition=false is used, node will be grouped at (O, O) position of group, and
            // it's position should be set after the call to groupNode().
        }
    }