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View Full Version : glDrawPixels + get pixel user clicked on



mark-w
05-08-2005, 06:21 PM
Hello all,

I wanted to make a simple image viewer using opengl. I have the opengl super bible ed. 2, followed their example for drawing a simple bitmap to screen using glDrawPixels, works nicely this is just what I want.

I'd like to determine which pixel of my on screen image the user has clicked on, assuming the user could have scaled/zoomed/panned the on screen image. Say the user has zoomed to a level in which only two pixels take up the entire viewport, and they click on one, is there a way to figure which pixel that is from my original image? I know how to get the mouse coords clicked, just need to know how to translate them into my original image coordinates.

Thanks for any suggestions,
Mark

dorbie
05-08-2005, 07:05 PM
Moving to the beginner's section.