PostScript(R) Language Program Design by Inc. Adobe Systems

By Inc. Adobe Systems

Introduces the Postscript programming language, describes the imaging version, and discusses emulators, web page layout, application constitution, scanned photographs, dossier merging, and mistake dealing with.

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7 TEXT OPERATIONS In the PostScript language, text is rendered with the show operator (or one of its relatives). The show operator is somewhat special in the PostScript imaging model, in that there are very specific requirements for setting text that may not apply when rendering other graphic elements. In particular, text characters are normally set one after another, along a baseline. The show operator leaves the current point when it is done, rather than destroying the path as other path painting operators do.

The imaging model consists of specific rules and mechanisms by which a picture is described, and its behavior is exactly predictable. The imaging model for silk-screening, for example, might be loosely stated like this: “Ink is forced through a mask of film that adheres to a stretched piece of silk. ” In the world of computers, all graphics application programs have a graphic imaging model, whether it is explicitly stated or simply assumed. Even text editors have a paradigm for the lines of text being edited.

It is important to construct efficient procedures. Defining a procedure and using it instead of a number of PostScript language commands is only a useful technique if the procedure is faster than the unrolled code would have been. There are a couple of considerations that make it easier to generate fast procedures: • What is the least amount of critical data needed from the host application to construct the required shape? • What is the natural order and format in which to supply the data, based on the PostScript operators to be used?

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