PostScript Language Tutorial and Cookbook by Adobe Systems Inc.

By Adobe Systems Inc.

PostScript, a innovative, device-independent web page description language, is readily turning into the regular for printing fine quality built-in textual content and graphics.It is a strong, versatile language that has the power to explain successfully the looks of textual content, photographs, and photograph fabric at the revealed web page. utilizing a number of annotated examples and brief courses, the educational offers a step by step guided journey of PostScript, highlighting these traits that make it this kind of certain and strong language.The cookbook deals a suite of a few of the main worthwhile innovations and strategies to be had to PostScript programmers.

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More complex curves may be defined using such operators as curveto (see the POSTSCRIPT Language Reference Manual). The arc operator adds a circular arc to the current path. It requires five arguments on the stack: the x and y coordinates of the arc’s center of curvature, the radius of curvature, and the arc’s beginning and ending angles measured counterclockwise from the positive x axis. 3 CURVES 53 100 150 36 45 90 arc 100 150 36 45 90 arc would produce an arc-shaped path on the current page with a center 100 units to the right and 150 units above the origin, a radius of 36 units, extending counterclockwise from 45 to 90 degrees (see illustration at left).

The current point is left at the end of the arc. Note that the arcto operator leaves the stack holding the numbers 50, 114, 86, and 150, which represent the beginning and endpoint of the arc. Since we do not need these values, we drop them from the stack with a repeated pop operator. 4 {pop} repeat Printing a Logo Let us use our curve-generating operators to print a logo for a movie named Omaha. This movie dwells on the loneliness of the Plains during the early nineteenth century and so its logo will be rather stark, consisting of a black background with the word “Omaha” rising from below and a gray circle, representing the full moon, behind.

Anything following a % on a POSTSCRIPT program line is ignored by the interpreter. This last program was quite repetitious; we performed a set of operations — drawing a filled box — three times. We shall see in the next chapter that the POSTSCRIPT language allows you to define a group of operations as a named procedure. This procedure can then be used exactly as though it were a POSTSCRIPT predefined operator. 1 POSTSCRIPT DICTIONARIES A dictionary is a table that associates pairs of objects. An English dictionary associates words with their definitions.

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