[Interest] Handling zooming in QtCharts

[Alan Ezust]

Because QChart is derived from QGraphicsView, you can also set the
setTransformationAnchor() to

QGraphicsView::AnchorUnderMouse and then scale() it.



On Mon, Jun 20, 2016 at 10:00 PM, Lorne Sturtevant <dragor at shaw.ca> wrote:

> I was able to find a way to zoom centred on the mouse.  What I did was
> make use of the QChart::plotArea() function.  With that function by
> using ChartView::wheelEvent(), I could get where in the chart the zoom
> is happening.  I then did some math and set the new zoom for the chart
> by adjusting the range for the chart's x and y axis.
>
> Fortunately I could do this with the existing API.  It would be nice if
> there was a cleaner API for doing this though.
>
> --
> Lorne Sturtevant
> Sum Ergo Cogito
>
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>
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