QPainter painter1(this);//新建类

   painter1.setRenderHint(QPainter::Antialiasing,true);//设置反锯齿

   painter1.setBrush(QBrush(/*Qt::green,*/ QPixmap(":/qmlicon/qmlicon/timeclock.png").scaled(size())));//添加填充颜色和图片

   painter1.setPen(Qt::NoPen);//设置外框颜色为NoPen

   painter1.drawEllipse( 1,  1, side - 2, side - 2);//开始画圆

QPainter类的一些问题