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Paint with QBrush

#include <QtGui> 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(); }