答案 0 :(得分:3)
void Widget::paintEvent(QPaintEvent *) {
draw(10,10,50,50);
}
void Widget::draw(int x,int y,int _width,int _height)
{
QPainter p(this);
p.setPen(QPen(Qt::red,3,Qt::SolidLine));
p.drawLine(x,y,x +0,_height/4+y);
p.drawLine(x,y+ _height,x + 0,_height - _height/4+y);
p.drawLine(x,y,x +_width/4,0+y);
p.drawLine(x,y+_height,x +_width/4,_height+y);
p.drawLine(_width+x,y+_height,x +_width - _width/4,_height+y);
p.drawLine(_width+x,y+_height,x +_width,_height - _height/4+y);
p.drawLine(_width+x,y,x + _width-_width/4,0+y);
p.drawLine(_width+x,y,_width+x,_height/4+y);
//custom brush for rectangle
//p.fillRect(x,y,_width,_height,QBrush(QColor(40,0,0,50)));
}