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qtqtcharts

Extracting XY Coordinates from QTCharts (a line series) on Mouse click

I'm trying to pick the X and Y Coordinates from a 2D Chart in QT when a mouse click is done on the 2D Chart widget.

I tried to use the mapFromScene , mapToValue and other similar functions that are available in the QTChart Library. But I'm unable to get the values.

Sample 2D Chart

Expected Output for XY Co-ords Extraction

Solution

  • I got the expected output for this problem.

    This is my Code which works fine for me.

    // function for mouse press events
void 2D_Graph::mousePressEvent (QMouseEvent * e) {
    if(chartView->chart()->isEnabled()) {
        auto curPoint = QCursor::pos();
        curPoint = chartView->mapFromGlobal(curPoint);
        auto pickVal = chartView->mapToScene(curPoint);
        pickVal = chartView->chart()->mapFromScene(curPoint);
        pickVal = chartView->chart()->mapToValue(curPoint,chartView->chart()->series().at(0));
        qDebug() << "Diagram Picked Value : " << pickVal;
    }
}