Computer co-ordinate system

Before writing some graphic applications using pygame, I want to explain about computer co-ordinate system.

Cartesian coordinate system is a rectangular coordinate system, mainly used in analytic geometry. As shown in following figure, every point in plane is identified by x and y coordinates

Computer coordinate system is little different from Cartesian coordinate system. The x-coordinate acts just like Cartesian system, but coordinates are reversed. Rather than the zero coordinates at the bottom of the graph like in Cartesian graphics, the zero coordinates is at the top of the screen with the computer.

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