#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;
QPen pen(Qt::red, 2); // red solid line, 2 pixels wide
painter.setPen(pen); // set the red, wide pen
painter.drawRect(40,30, 200,100); // draw a rectangle
painter.setPen(Qt::blue); // set blue pen, 0 pixel width
painter.drawLine(40,30, 240,130); // draw a diagonal in rectangle
painter.end(); // painting done
QWidget widget;
QPalette palette;
palette.setBrush(widget.backgroundRole(), brush);
widget.setPalette(palette);
widget.show();
return app.exec();
}