48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
#ifndef CUSTOMELLIPSE_H
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#define CUSTOMELLIPSE_H
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#include <qcustomplot.h>
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class CustomEllipse : public QCPItemEllipse
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{
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public:
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CustomEllipse(QCustomPlot *parentPlot) : QCPItemEllipse(parentPlot) {}
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// 重写绘制函数
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virtual void draw(QCPPainter *painter) override
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{
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// 自定义绘制代码
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//painter->setPen(QPen(Qt::blue, 2)); // 例如，改变边框颜色和宽度
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//painter->setBrush(QBrush(Qt::green)); // 改变填充颜色
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QCPItemEllipse::draw(painter); // 调用基类的绘制函数
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return;
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QPointF p1 = topLeft->pixelPosition();
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//QPointF p2 = bottomRight->pixelPosition();
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QPointF p2 = QPointF(p1.rx()+5, p1.ry()+5);
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if (p1.toPoint() == p2.toPoint()) {
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return;
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}
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QRectF ellipseRect = QRectF(p1, p2).normalized();
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const int clipEnlarge = qCeil(mainPen().widthF());
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QRect clip = clipRect().adjusted(-clipEnlarge, -clipEnlarge, clipEnlarge, clipEnlarge);
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if (ellipseRect.intersects(clip)) { // only draw if bounding rect of ellipse is visible in cliprect
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painter->setPen(mainPen());
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painter->setBrush(mainBrush());
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#ifdef __EXCEPTIONS
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try { // drawEllipse sometimes throws exceptions if ellipse is too big
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#endif
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painter->drawEllipse(ellipseRect);
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#ifdef __EXCEPTIONS
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} catch (...) {
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qDebug() << Q_FUNC_INFO << "Item too large for memory, setting invisible";
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setVisible(false);
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}
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#endif
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}
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}
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// 可以添加更多自定义方法或属性
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};
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#endif // CUSTOMELLIPSE_H
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