pinch to zoom questions clarify

SAMmanSAMman Member Posts: 228
edited November -1 in Working with GS (Mac)
Hey all, I have read a lot on the subject of pinch to zoom, but I am still confused about. is there a simple way to implement it? I saw this from 7 months ago, "How do we pinchzoom?
[New image width] = [previous image width]*[(updating finger distance)/(starting finger distance)]
Easy, isn't it?" but it isn't easy for me to understand. I checked out scitunes example but that is a 2 finger touch zoom. Anyone have any ideas on a pinch zoom? Thanks.
SM

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