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本帖被 XChinux 执行加亮操作(2016-04-23)
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- void aaq::paintEvent( QPaintEvent* ev )
- {
- QPainter painter(this);
- // 去除画笔
- painter.setPen(Qt::NoPen);
- // 设置反锯齿
- painter.setRenderHint(QPainter::Antialiasing);
- //******************************************** 圆饼图 *****************************************//
- if(1)
- {
- // 顶层圆面
- QRectF rect_top(10.0, 20.0, 280.0, 160.0);
- // 底层圆面
- QRectF rect_bottom(10.0, 60.0, 280.0, 160.0);
- // 中间矩形
- QRectF rect_midd(10.0, 100.0, 280.0, 40.0);
- // 扇形起始角度
- int startAngle = 230 * 16;
- // 扇形覆盖范围
- int spanAngle = 60 * 16;
- painter.setBrush(QColor(97,35,35,255));
- // 绘制底层圆面
- painter.drawEllipse(rect_bottom);
- // 绘制中间矩形
- painter.drawRect(rect_midd);
- painter.setBrush(QColor(Qt::darkYellow));
- // 绘制底层扇形
- painter.drawPie(rect_bottom, startAngle, spanAngle);
- // 扇形的弦与弧的交点
- double pi = 3.1415926;
- double dx1 = rect_top.width() * 0.5 * cos(230 * pi / 180);
- double dy1 = rect_top.height() * 0.5 * sin(230 * pi / 180);
- double dx2 = rect_top.width() * 0.5 * cos(290 * pi / 180);
- double dy2 = rect_top.height() * 0.5 * sin(290 * pi / 180);
- // 求交点的坐标值
- QPointF posBackCenter = QPointF(rect_top.center());
- double dX1 = posBackCenter.x() + dx1 + 0.5;
- double dY1 = posBackCenter.y() - dy1 + 0.5;
- double dX2 = posBackCenter.x() + dx2 + 0.5;
- double dY2 = posBackCenter.y() - dy2 + 0.5;
- // 记录交点
- QPointF topLeft = QPointF(dX1, dY1);
- QPointF bottomRight = QPointF(dX2, dY2) + QPointF(0,40);
- QPointF bottomLeft = topLeft + QPointF(0,40);
- painter.setBrush(QColor(Qt::darkYellow));
- // 绘制连接扇形的区域
- QPolygonF path;
- path << topLeft << QPointF(dX2,dY2) << bottomRight << bottomLeft;
- painter.drawPolygon(path);
- // 绘制顶层圆面
- painter.setBrush(QColor(156,56,56,255));
- painter.drawEllipse(rect_top);
- // 绘制顶层扇形
- painter.setBrush(QColor(Qt::yellow));
- painter.drawPie(rect_top, startAngle, spanAngle);
- }
- QWidget::paintEvent(ev);
- }
 工作中偶尔遇到了,觉得挺好玩,记录一下. 希望可以帮到有需要的朋友们..
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