void Dialog::paintEvent(QPaintEvent *)
QPainter painter(this);
painter.drawLine(0,0,100,100);
pen.setColor(QColor(255,0,0));
QBrush brush(QColor(0,255,0,125));
//brush.setC
painter.setPen(pen);
painter.setBrush(brush);
painter.drawRect(100,100,200,200);
QRectF rectangle(10.0,20.0,80.0,60.0);
painter.drawRect(10.0,20.0,80.0,60.0);
int startangle=0*16;
int spanangle=200*16;
painter.drawArc(rectangle,startangle,spanangle);
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