Hi.
I have multiple line graphs that stacked above eachother, something like https://www.qcustomplot.com/images/examples/scatterstyledemo.png
I enabled selection and multiple selection with setInteractions(QCP::iSelectPlottables | QCP::iMultiSelect)
and setSelectionRectMode(QCP::srmSelect);
But I want to select all graphs by mouse dragging, at the same time. actually I want vertical lines instead of a rectangle for selection. How can I do this? I think subclassing QCPSelectionRect will do it but I don't know how.