Is there a way to get mouse's coordinates on plotting area of a QChartView
? Preferably in the axis units. The goal is to display mouse's coordinates while moving the mouse around on the plot so the user can measure plotted objects.
I couldn't find any built in function for this on QChartView
, so I'm trying to use QChartView::mouseMoveEvent(QMouseEvent *event)
to try and calculate the resulting position in the plotting area. The problem is I can't get any reference to the plot area's coordinate system.
I've tried using mapToScene
, mapToItem
and mapToParent
and also the reverse mapFrom...
on all objects I can grab a hold of to try to do this, but to no avail.
I've found that QChartView::chart->childItems()[2]
is indeed the plotting area, excluding the axis and axis labels. I can then call QChartView::chart->childItems()[2]->setCursor(Qt::CrossCursor)
to make a cross appear only on the plotting area and not on the adjacent objects. But still, nothing I try seems to make a correct reference to this object's coordinate system.
QChartView
is simply a QGraphicsView
with an embedded scene()
. To get coordinates within any of the charts, you have to go through several coordinate transformations:
view->mapToScene
: widget (view) coordinates → scene coordinateschart->mapFromScene
: scene coordinates → chart item coordinateschart->mapToValue
: chart item coordinates → value in a given series.The term "chart item" and "chart widget" are synonyms, since QChart
is-a QGraphicsWidget
is-a QGraphicsItem
. Note that QGraphicsWidget
is not a QWidget
!
Implementing it like this works like a charm (thanks, Marcel!):
auto const widgetPos = event->localPos();
auto const scenePos = mapToScene(QPoint(static_cast<int>(widgetPos.x()), static_cast<int>(widgetPos.y())));
auto const chartItemPos = chart()->mapFromScene(scenePos);
auto const valueGivenSeries = chart()->mapToValue(chartItemPos);
qDebug() << "widgetPos:" << widgetPos;
qDebug() << "scenePos:" << scenePos;
qDebug() << "chartItemPos:" << chartItemPos;
qDebug() << "valSeries:" << valueGivenSeries;
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