QPaint绘制坐标系问题

[sinat_33495068]

//painter.rotate(180);横坐标
painter.drawText(40,75,20,20,Qt::AlignHCenter|Qt::AlignTop,QString::number(0));
painter.drawText(90,75,20,20,Qt::AlignHCenter|Qt::AlignTop,QString::number(1));
painter.drawText(140,75,20,20,Qt::AlignHCenter|Qt::AlignTop,QString::number(2));
painter.drawText(190,75,20,20,Qt::AlignHCenter|Qt::AlignTop,QString::number(3));
painter.drawText(240,75,20,20,Qt::AlignHCenter|Qt::AlignTop,QString::number(4));
painter.drawText(290,75,20,20,Qt::AlignHCenter|Qt::AlignTop,QString::number(5));
//纵坐标
painter.drawText(25,150,20,20,Qt::AlignHCenter|Qt::AlignLeft,QString::number(1));
painter.drawText(25,200,20,20,Qt::AlignHCenter|Qt::AlignLeft,QString::number(2));
painter.drawText(25,250,20,20,Qt::AlignHCenter|Qt::AlignLeft,QString::number(3));
painter.drawText(25,300,20,20,Qt::AlignHCenter|Qt::AlignLeft,QString::number(4));
painter.drawText(25,350,20,20,Qt::AlignHCenter|Qt::AlignLeft,QString::number(5));
用这一段代码写坐标系时为什么出来的字体是反的就是坐标下面出来的1，2,3,4,5都是倒着的，图片上传不了。