Ничего не получается с рисованием на виджете Опции

[Гость_Тёма_*]

Как вообще рисовать в Qt?

[Litkevich Yuriy]

Из книжки Макса Шлее:

#include <QtGui>

// ======================================================================
class PainterPathWidget : public QWidget {
protected:
    virtual void paintEvent(QPaintEvent*)
    {
        QPainterPath path;
        QPointF      pt1(width(), height() / 2);
        QPointF      pt2(width() / 2, -height());
        QPointF      pt3(width() / 2, 2 * height());
        QPointF      pt4(0, height() / 2);
        path.moveTo(pt1);
        path.cubicTo(pt2, pt3, pt4);

        QRect rect(width() / 4, height() / 4, width() / 2, height() / 2);
        path.addRect(rect);
        path.addEllipse(rect);

        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing, true);
        painter.setPen(QPen(Qt::blue, 6));
        painter.drawPath(path);    
    }

public:
    PainterPathWidget(QWidget* pwgt = 0) : QWidget(pwgt)
    {
    }
};

// ----------------------------------------------------------------------
int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    PainterPathWidget wgt;

    wgt.resize(200, 200);
    wgt.show();

    return app.exec();
}