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 ChartZoom and high DPI

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samsmith_au Posted - 11 Nov 2016 : 07:25:38
On a device with high DPI, running windows 10, the zoom rectangle shown when the user is selecting an area to zoom in is drawn incorrectly.
If you override the Mousedown, Mousemove and Mouseup and applied a zoom scale, the zoom rectangle is the correct size, but still has a Y offset.
The resulting zoom is correct.

This issue can be seen in the Simple Zooming example from your website, when run on a Windows 10 computer with a DPI higher that 96. (QCChart2DDemoR2.zip)

Is there a work around ?
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quinncurtis Posted - 11 Nov 2016 : 09:19:14
If you right click on the Windows 10 desktop, and bring up the computer display settings dialog, check to see that the scroll bar under "Change the size of text, apps and other items" is at 100% (all the way to the left). Otherwise Windows 10 pretty much breaks every program which uses the .Net XOR mode, as our zoom mode does, since that mode will no longer convert properly between screen and .Net window coordinates. It hasn't been a big issue, since most are running at 100%. We will have to get rid of all XOR processing in a future release in order to make a version compatible with Windows 10 running under any magnification.

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