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By Barry Thomas (auth.)

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Finally, the pattern is stroked and printed out Try changing the distance by which the origin is moved each time. This will give a multiple pattern effect, but you may need to increase the number of iterations to produce an acceptable pattern. 58 A POSTSCRIPT COOKBOOK BITMAPPED GRAPHICS PosTScRIPT has two operators which enable raw hexadecimal data to be built up into bit-mapped images; imagemask and image. The first of these takes one byte of hexadecimal data and produces from it eight image pixels, one bit per pixel.

This is used to center the text around the vertical, rather than starting at the top of the circle and rolling around to some unspecified end. The main procedure takes each character of the string in turn, moves to the edge of the circle and puts the character into a one element string. The width of this string is found and an angle calculated from the amount of the circle's circumference that the current character will cover. The graphics state is then saved. The origin is moved to the start point of the current character.

If you intend to produce output on any other device, take care to follow any device-dependent procedures required by that device. 33 34 A POSTSCRIPT COOKBOOK PLAIN PAGE FRAME This program produces a plain line frame around an A4 page approximately lOmm from the edge of the sheet. The program demonstrates the use of basic line drawing using moveto, rlineto and stroke. Some PosTSCRIPT devices have a non-printing margin around the edge of a page. This program should allow the whole frame to be seen on most laser printers.

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