QT学习之路 - 颜色渐变（27）

工程代码： 24.rar  
http://devbean.blog.51cto.com/448512/238168

void PaintedWidget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing,true);//反走样
    QLinearGradient linearGradient(60,50,200,200);//线性渐变
    linearGradient.setColorAt(0.2,Qt::white);
    linearGradient.setColorAt(0.6,Qt::green);
    linearGradient.setColorAt(1.0,Qt::black);
                               //
    QRadialGradient radialGradient(100,100,100,200,200);//辐射渐变
    radialGradient.setColorAt(0.2,Qt::white);
    radialGradient.setColorAt(0.6,Qt::green);
    radialGradient.setColorAt(1,Qt::black);

   painter.setBrush(QBrush(radialGradient));//画刷
   painter.drawEllipse(50,50,200,150);//画椭圆
  //  painter.setPen(QPen(QBrush(linearGradient),5));//画线
  //  painter.drawLine(50,50,200,200);
}