Pic is a domain-specific language by Brian Kernighan diagrams to specify in terms of objects such as boxes with arrows between them. The compiler pic this description is translated into concrete action commands drawing. Pic is a procedural programming language, with variable assignment, macros, conditionals and loops. Language is an example of a little language originally intended for the convenience of non-programmers in the Unix environment (Bently 1988). Pic was first implemented, and even more commonly used as a preprocessor in the processing system troff documents. The preprocessor pic filters troff a document, which replaces diagram specific descriptions of the drawing commands, and spends the rest of the document through without change. A version of the photo is included in groff, the version of GNU troff. GNU pic can also act as a preprocessor TeX documents. Arbitrary diagram can be included in the text formatting word processor for the photo output is directed, and after the processor arbitrary commands can also be included. Dwight Aplevich implementation, TRIPs, can also generate images postscript itself, as well as act as a preprocessor. The three main sources of processors are pic pic GNU, which is found in many systems linux, and dpic, which are free, and the original AT & T pic.
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