QPainter类

 

 

void Widget::paintEvent(QPaintEvent *event)

{

//    QPainter painter(this);   //实例化画家对象，this指定的是绘图设备

//    QPen pen(Qt::red);

//    painter.setPen(pen);

//    QBrush brush(Qt::cyan);

//    brush.setStyle(Qt::Dense7Pattern);

//    painter.setBrush(brush);

//    painter.drawLine(QPoint(0,0),QPoint(100,100));

//    painter.drawEllipse(QPoint(100,100),50,50);

//    painter.drawText(QRect(100,200,200,50),"好好学习，天天向上");

    //--------------------------------

    QPainter painter(this);   //实例化画家对象，this指定的是绘图设备

    painter.drawPixmap(pox,100,QPixmap(":/pikaqiu.gif"));

}

手动调用 用update();