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How can the scale (zoom in/out) be changed?

Malek103197
Malek103197 asked
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Last Modified: 2013-11-20
How can the scale (zoom in/out) be changed?

I am trying to change the 'scale' of  drawn images (lines, rectangles…).I have tried using ScaleViewportExt() and ScaleWindowExt() in combination with MapMode(MM_ANISOTROPIC), SetWindowOrg(), SetWindowExt(), SetViewportOrg() and SetViewportExt(), but have had no luck -my image remains unchanged. Any help dealing with drawings using the CClientDC would be a great, thanks.
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The basic concept provided in the answer is correct, but I still had to adddress the issue of changing the origin as the scale changes, otherwise the image would "walk" across the screen. Thanks for the help.

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