QCustomPlot 简单使用(三)

最新推荐文章于 2025-09-13 15:35:13 发布

原创最新推荐文章于 2025-09-13 15:35:13 发布 · 1.3k 阅读

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#qt #QCustomPlot #绘图 #标记 #QCPItemTracer

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本文介绍如何使用QCPItemTracer类在QCustomPlot的折线图中对超过阈值的数据点进行标记，包括设置标记样式、颜色和大小，并提供清除标记的方法。

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绘制折线图时，有时候数据需要做一些标记，如下图所示效果，用到了 QCPItemTracer 类记录备忘

void Storeplot::PlotSetTag(QCPGraph *Graph, double threshold, QVector<QCPItemTracer *> *TagVector)
{
    QSharedPointer<QCPGraphDataContainer> tmpContainer;
    tmpContainer = Graph->data();
    int low = 0, high = tmpContainer->size();
    double x,y;
    qDebug("start TagVector.size()=%d", TagVector->size());
    for(low = 0; low < high; low++)
    {
        y = (tmpContainer->constBegin() + low)->mainValue();

        if(threshold < y)
        {
            QCPItemTracer *tempTracer = new QCPItemTracer(ui->plot);
            tempTracer->setGraph(Graph);
            tempTracer->setInterpolating(true);
            tempTracer->setStyle(QCPItemTracer::tsCircle);
            tempTracer->setPen(QPen(Qt::red));
            tempTracer->setBrush(Qt::red);
            tempTracer->setSize(7);
            tempTracer->setGraphKey((tmpContainer->constBegin() + low)->mainKey());
            TagVector->append(tempTracer);
            //qDebug("i =%d y =%f %f", low, y, (tmpContainer->constBegin() + low)->mainKey());
        }
    }
    qDebug("TagVector.size()=%d", TagVector->size());
    qDebug("high =%d threshold=%f", high, threshold);
    ui->plot->replot();
}

void Storeplot::PlotClearTag(QVector<QCPItemTracer *> *TagVector)
{
    qDebug("PlotClearTag TagVector.size()=%d", TagVector->size());
    for(int i = 0; i < TagVector->size(); i++)
    {
        QCPItemTracer *tempTracer = TagVector->at(i);
        tempTracer->setGraph(0);
        ui->plot->removeItem(tempTracer);
        //delete tempTracer;
    }
    TagVector->clear();
    qDebug("PlotClearTag TagVector.size()=%d", TagVector->size());
    ui->plot->replot();
}

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