• We use modeling coordinates for individual parts of a 2D scene. For example,your polygon function put the polygon at the origin with a “radius” of 1.Those were modeling coordinates.
• World coordinates are used for organizing the parts into a scene.
• View coordinates are the coordinates within the desired viewport which is
somewhere within the window you are using.
• Normalized coordinates are between 0 and 1 or -1 and 1 in each direction.
They are used to make the viewing process independent of the output device.
• Device coordinates are relative to the actual display area on whatever device
you are using.
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