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The reason for the first bug you mentioned is just the way WoW decides to render the out of bounds area of a texture's image. It tends to duplicate the last pixel out past the bounds of the image in order to fill the rendering area of the texture. This has nothing to do with texture:SetRotation() and will show up if you use texture:SetTexCoord() with coordinates that extend out of bounds.
The problem in which the SQRT method fixes is that Blizzard chose to have a texture shrink so the corners of an image fit in it at a 45 degree angle whenever texture:SetRotation() is used. If you manually calculate the coordinates of the corners and set the texcoord yourself, this doesn't apply. Although it's probably easier and more efficient to just multiply the intended size of the texture object with SQRT(2) as shown by your code example.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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Last edited by SDPhantom : 03-13-13 at 12:46 PM.
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