Drawing diagrams in TEX documents

The typesetting language TEX [Knuth (1984)] is now available on a range of computers from mainframes to micros. It has an unequalled ability to typeset mathematical text, with its many formatting features and fonts. TEX has facilities for drawing diagrams using the packages tpic and PiCTEX. This paper describes a TEX preprocessor written in Pascal which allows a programmer to embed diagrams in TEX documents. These diagrams may involve straight or curved lines and labelling text. The package is provided for people who either do not have access to tpic or PiCTEX or who prefer to program in Pascal