I don't often review books, but this sleeper needs a good review.
Most of the books on graphics for "Pascal" feature a particular
implementation of Pascal. This is a book that features
non-implementation specific examples. Starting with a simple get
and set pixel routines, the author explains how all the higher
level functions are performed, with real code examples. He then
gives several chapters of real world systems that these principles can be used on.
Formerly I have been using C graphics books and translating the
code to Pascal for use. Other Pascal graphics books are simply
cookbooks for a particular implementation.