#include
int main(int argv, char **args)
{
QApplication app(argv, args);
QLinearGradient linearGrad(QPointF(100, 100), QPointF(200, 200));
linearGrad.setColorAt(0, Qt::black);
linearGrad.setColorAt(1, Qt::white);
QBrush brush(linearGrad);
QPainter painter;
painter.setBrush(brush); // set the yellow brush
painter.setPen(Qt::NoPen); // do not draw outline
painter.drawRect(40,30, 200,100); // draw filled rectangle
painter.setBrush(Qt::NoBrush); // do not fill
painter.setPen(Qt::black); // set black pen, 0 pixel width
painter.drawRect(10,10, 30,20); // draw rectangle outline
painter.end(); // painting done
QWidget widget;
QPalette palette;
palette.setBrush(widget.backgroundRole(), brush);
widget.setPalette(palette);
widget.show();
return app.exec();
}