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Coordinates of Pixels

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Coordinates of Pixels

Subject: Coordinates of Pixels
From: Richard Somers <email@hidden>
Date: Wed, 18 Jul 2007 14:06:54 -0600

This may be elementary computer graphics but I can't seem to find the answer.

Consider a rectangular matrix of pixels in device space with the origin at the lower left corner. Is the pixel at the lower left corner pixel 0, 0 or pixel 1, 1?

When mapping from user space to device space (userSpaceScaleFactor = 1.0) are pixels considered located at even integer boundaries or half way in-between?

The Cocoa Drawing Guide example Listing 3-1 for pixel-exact drawing adjusts the origin of the drawn rectangle by 0.5 in x and y. This would lead you to the conclusion that the center of the pixels fall on 0.5 increment boundaries when overlaid with a floating point coordinate system from user space. Is this a correct conclusion?

Regards, Richard
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