QPainter绘制特殊线条

参考资料：

https://www.cnblogs.com/Jace-Lee/p/5946342.html

效果图：

 

代码：

void WgtText::paintEvent(QPaintEvent *event)

{

    QPainter painter(this);

    QPen pen;  // creates a default pen

    pen.setStyle(Qt::DashDotLine);

    pen.setWidth(3);

    pen.setBrush(Qt::blue);

    pen.setCapStyle(Qt::RoundCap);

    pen.setJoinStyle(Qt::RoundJoin);

    painter.setPen(pen);

    QPointF point_start(10,10);

    QPointF point_end(300, 400);

    painter.drawLine(point_start, point_end);

}