Scaling an image using the mouse in a WinForms application?

You're scaling won't be smooth if you use the center of the image. Instead, use the initial mouse down point (call it p0). Also, rather than using the distance from that point to the current drag point (e), just take the difference along one axis (e.g. Exp(e.

Y - p0. Y)).

It looks to me (from the scaleAvg calculation) like you're rescaling the already-scaled image. This is a really bad idea because scaling is lossy and the errors will accumulate. Instead, keep a copy of the crisp original image and scale the original directly to the current size.

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