#include <QtGui>

int main(int argc, char **argv)
{
    QApplication a(argc, argv);
    QPen pen;
    pen.setColor( QColor(0, 0, 255) );
    pen.setWidth(2.0);
    pen.setCapStyle(Qt::FlatCap);
    pen.setStyle(Qt::SolidLine);
    QPainterPath path;
    path.moveTo(-50, -50);
    path.lineTo (-50, 50);
    path.lineTo (50, 50);
    path.lineTo (50, -50);
    path.closeSubpath();

    QPixmap p(200, 200);
    p.fill(Qt::white);
    QPainter painter(&p);
    painter.translate(100, 100);
    painter.setPen(pen);
    painter.drawPath(path);

    // now switch to custom dashed line...
    QVector<qreal> dashes;
    dashes << 4 << 2;
    pen.setDashPattern(dashes);
    pen.setColor(Qt::black);

    const int x1 = -50;
    const int x2 =  50;
    int y = -45;
    qreal offset = 5.5;

    for ( int i = 0; i < 20; i++)
    {
        pen.setDashOffset(offset);
        painter.setPen(pen);
        painter.drawLine(x1, y, x2, y);
        y += 4;
        offset -= 0.5;
    }
    painter.end();

    p.save("test.png", "PNG");
    return 0;
}