A computer programming term.
It is a difficult business writing software to produce screen graphics.
Typical tasks a graphics coder would need to deal with is 3 dimensional rendering, rotating objects, shading objects, lighting objects and so on.
This is where a good graphics library comes in. The library will contain a number of useful sub-routines. These sub-routines are pieces of code that perform a certain job, for example a 'shading' subroutine or a 'rotate' sub-routine. The graphics designer then calls up these routines with a few simple commands.
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Click on this link: Graphics Library