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algorithm application program array beam button center of projection Chapter character clipping color command coordinate system cursor curve data structure defined deflection delete discussed display file DPU program dynamic edge electrons endpoints example feedback function graphics package graphics system grid hardware hierarchy homogeneous coordinates image transformations implementation instance transformation instruction integer intensity interactive graphics interface intersection keyboard light pen locator logical matrix menu move normalized device coordinates object output primitives parallel projection parameters perspective projection pick picture pixel pixel value polygon polygon mesh position procedure processor projection plane raster display raster graphics raster scan refresh buffer representation rotation scale scan line screen Section segment sequence shown in Fig shows simulated specified storage subroutine symbol tablet techniques tion translation typically update vector view plane view surface view volume viewing operation viewport window z-axis