vanilla-wow-addons – Rev 1

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if Affine then return; end

Affine = {
        Transform = function(vList, xOff, yOff)
                assert(vList, "No vertex list given.")
                
                xOff = xOff or 0;
                yOff = yOff or 0;
                
                for _, vert in pairs(vList) do
                        vert.x = vert.x + xOff
                        vert.y = vert.y + yOff
                end
        end,
        
        Rotate = function(vList, angle)
                assert(vList, "No vertex list given.")
                
                angle = angle or 0;
                
                for _, vert in pairs(vList) do
                        vert.x = vert.x * cos(angle) - vert.y * sin(angle)
                        vert.y = vert.x * sin(angle) + vert.y * cos(angle)
                end
        end,
        
        Scale = function(vList, xScale, yScale)
                assert(vList, "No vertex list given.")
                
                xScale = xScale or 1;
                yScale = yScale or 1;
                
                for _, vert in pairs(vList) do
                        vert.x = vert.x * xScale
                        vert.y = vert.y * yScale
                end                             
        end,
}

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