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2D refers to two dimensional space where coordinates are represented with X and Y values.

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Efficient way of drawing outlines around sprites

Replace the color of the original sprite with outline color (or even tint it if you like). Render this flat-shaded or tinted sprite four times with a 1 pixel offset: at x,y =(-1,-1), then (+1,-1), the …
Ilya Bossov's user avatar