Accessing a texture within a texture.

[Bleckpan]

http://wowprogramming.com/BlizzArt/I...P/POIIcons.png Say I want to use the blue horse, how would I be able to use it? As far as I can tell, there are no extra arguments that I can call while setting the texture. I know that the blue horse is index number 38, does this help?

[Verttex]

Crop it out, convert to BLP?

[Nibelheim]

http://www.wowwiki.com/API_Texture_SetTexCoord

Allows you to display a sub-region within a texture.


I.e, this will show the bottom-left quarter of a texture:

texture:SetTexture(MyFile)
texture:SetTexCoord(0, 0.5, 0.5, 1)

or for a blue horsey:

texture:SetTexture(MyFile)
texture:SetTexCoord(10/14, 11/14, 2/14, 3/14)

or something Never really used them before.

[Bleckpan]

In case if anyone is wondering about this, I found that in the World Map lua file, blizzard uses this function:

local function GetPOITextureCoords(index)
	local worldMapPixelsPerIcon = 18;
	local worldMapIconDimension = 16;
	
	local offsetPixelsPerSide = (worldMapPixelsPerIcon - worldMapIconDimension)/2;
	local normalizedOffsetPerSide = offsetPixelsPerSide * 1/WORLDMAP_POI_TEXTURE_WIDTH;
	local xCoord1, xCoord2, yCoord1, yCoord2; 
	local coordIncrement = worldMapPixelsPerIcon / WORLDMAP_POI_TEXTURE_WIDTH;
	local xOffset = mod(index, NUM_WORLDMAP_POI_COLUMNS);
	local yOffset = floor(index / NUM_WORLDMAP_POI_COLUMNS);
	
	xCoord1 = xOffset * coordIncrement + normalizedOffsetPerSide;
	xCoord2 = xCoord1 + coordIncrement - normalizedOffsetPerSide;
	yCoord1 = yOffset * coordIncrement + normalizedOffsetPerSide;
	yCoord2 = yCoord1 + coordIncrement - normalizedOffsetPerSide;

        return xCoord1, xCoord2, yCoord1, yCoord2

You simply call this to get the correct coordinates to use for "SetTexCoords".