View VapourSynth Output in .NET

[Mystery Keeper]

https://bitbucket.org/mystery_keeper/vapoursynth-editor
Study the source. It does many things.
API use, installation path discovery, async requests, preview - it's all there.

[ChaosKing]

This is how I do a reg query in python to check for a VS installation.

import winreg
	try:
		aReg = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE)
		aKey = winreg.OpenKey(aReg, r"SOFTWARE\VapourSynth")
		q = winreg.QueryValueEx(aKey, 'Plugins')
		return q[0]
	except Exception as e:
		pass
		
	return None

[MysteryX]

I'm nearly done writing VapourSynth Multi-Viewer, a tool allowing to view multiple scripts side-by-side, while padding, zoom and seeking simultaneously in all tabs. This will make it easier to see which settings give the best results on the eyes. Zoom in the eyes, and switch between the various script versions.

However there's a math problem I haven't been been able to resolve; and some of you guys are really good with low-level math problems.

https://github.com/mysteryx93/Emerge...Viewer.cs#L130

This adjusts scrollbar positions when zooming. Currently it maintains the top-left corner fixed when zooming in and out. Ideally I would want to maintain the center fixed when zooming in and out using keyboard, or keep the image under the mouse fixed when zooming using the mouse wheel. Any idea which formula would achieve that?

[ChaosKing]

Something like this?
https://stackoverflow.com/questions/...heel-scrolling
https://gamedev.stackexchange.com/qu...or-calculation

[MysteryX]

Something like that, but the variables are a bit different so it's still confusing. Got everything else working but this.