QGraphicsViewの表面にテキストを表示するサンプル

text_on_graphicsview.cpp

#include <QtGui>

class Window : public QGraphicsView
{
    Q_OBJECT
public:
    Window() {
        setScene(new QGraphicsScene(-200, -200, 400, 400));
        setDragMode(ScrollHandDrag);
        drawMesh();
        resize(200, 200);
        setViewportUpdateMode(FullViewportUpdate);
    }
protected:
    void paintEvent(QPaintEvent *event) {
        QPainter p(this);
        p.drawText(QRect(0, 0, width() - 20, p.font().pointSize()), "hogehoge", QTextOption(Qt::AlignTop | Qt::AlignRight));
        QGraphicsView::paintEvent(event);
    }
private:
    void drawMesh() {
        const QRectF rect = scene()->sceneRect();
        for (int i = rect.left(); i <= rect.right(); i += 10)
            scene()->addLine(i, rect.top(), i, rect.bottom()), scene()->addLine(rect.left(), i, rect.right(), i);
    }
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    Window w;
    w.show();
    return app.exec();
}

#include "text_on_graphicsview.moc"