I think this feature was implemented mid-2017, and it was about then that I raised the issue <https://www.mail-archive.com/[email protected]/msg06518.html> of a bug with canvas zooming and bitmap background images.
There were a couple of commits <https://github.com/therion/therion/search?q=zoom&type=Commits> to resolve this 25 June 2018, and the effect for me since then has been is that mouse wheel zooming has been non-existent (although the code edits suggest something should happen on wheel rotation). So I am intrigued that you say it is working, even if very slowly. I seem to recall that the functionality was; Ctrl+mouse-wheel to zoom in and out the XTherion canvas. Currently version 5.4.4+bd62e22 does not respond at all to this control (and it does it quickly ie no hint that a redraw is being attempted or that there is an error condition). Same behaviour for all versions (on Windows 10) since 25 June 2018. So what am I missing? How does one activate the mouse wheel scrolling? It is a nice feature (so long as its not too slow as Nick has experienced). Bruce From: Therion <[email protected]> On Behalf Of Nick Bairstow Sent: Wednesday, 17 July 2019 07:54 To: [email protected] Subject: Re: [Therion] XtTherion canvas zoom with the mouse wheel bug 5.4.4 seems to have cured this very annoying issue (so hard not to scroll) but now with this latest release any scrolling is so ridiculously slow on my Windows machine, I'm going back to 5.4.1 which scrolled fine. I will dig out a none scroll wheel mouse for the few times I have to use a scanned image. Nick
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