Editing WoW:API Texture SetTexCoordModifiesRect (section)

== Details ==

By default a Texture object renders the underlying texture image across the entire surface of the Texture region, so setting TexCoords that represent a subset of the underlying image results in a scaled or stretched result. If SetTexCoordModifiesRect is set to true, then the rendering rectangle is adjusted relative to the Texture region, so that sizing/scaling will be preserved relative to the original (0,1,0,1) coordinates. The new rendering area has the same BOTTOMLEFT corner as the Texture region, but then a width and height defined as follows:

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T is a texture with a display width of W and display height of H.

T:SetTexCoordModifiesRect(true) is called 

T:SetTexCoord(x1,x2, y1,y2) is then executed

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The texture image is then rendered onto a screen region with the same BOTTOMLEFT corner as T, but with a width of W * (abs(x2-x1)) and height of H * (abs(y2-y1))

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