Ptolemy provides rich libraries of stars for the more mature domains. Since the stars were designed to be as generic as possible, many complicated functions can be realized by a galaxy. Nonetheless, no star library can possibly be complete; you may need to design your own stars. The Ptolemy preprocessor language makes this easier than it could be. This chapter is devoted to the use of the preprocessor language.
Newly designed stars can be dynamically linked into Ptolemy, avoiding frequent recompilation of the system. If the new stars are generic and useful, however, it might be better to add them to the list of compiled-in stars and rebuild the system. See
"Creating Custom Versions of pigiRpc" on page 1-6.
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