qt绘制圆环的方式

QPainter painter(this);

方式一：

QPainterPath path2;

    point.setX(300);point.setY(320);

    // 添加外圆的路径

    path2.addEllipse(point, 10, 10);

    // 添加内圆的路径

    path2.addEllipse(point, 8, 8);

    // 绘制圆环

    painter.fillPath(path2, Qt::blue);

    painter.drawPath(path2);

方式二：

    QPainterPath path3;

    path3.addEllipse(5,5,20,20);

    path3.addEllipse(10,10,10,10);

    painter.setRenderHint(QPainter::Antialiasing);

    painter.setBrush(QBrush(QColor("lightblue")));

    painter.drawPath(path3);