POSTSCRIPT

Figure 2-4.Stroke function

The top illustration above shows four columns of three pixels on the printing device. The dashed lines intersect at the center points of the device pixels or dots. The columns from left to right are designated as columns 1, 2, 3, and 4.

The lower illustration builds on the top illustration by adding two vertical line segments that will be stroked. The sides of the line to be stroked are indicated with solid bold lines. The line to right has its left side to the left of the center point of the third column of pixels and has its right side to the right of the center point of the fourth column. Because the center points of the third and fourth columns of pixels are within the thickness of this line, all six pixels are turned on (indicated in this picture by cross-hatching the pixels). Contrast this with the line on the first and second columns of pixels. Because the center point of the second column falls outside its boundaries, only the first column is turned on.

Fill

The Fill function controls the shapes, zero-width lines, curved shapes, and image operators.

Shapes

A shape is a path to be painted with the current color or with a pattern. To paint shapes, “insideness” computations need to be performed. These determine which pixels fall inside and outside the shape. During fill, the pixels whose centers lie within the inside boundaries of the shape are turned on. Those whose centers lie outside the shape are turned off.

Some PostScript creators describe long, very thin, rectangular fill regions in the masters (for example, boundaries of boxes or rules). DocuPrint selects some of those shapes and treats them as thin paths that are “stroked” to ensure that they are imaged (painted).

XEROX DOCUPRINT NPS GUIDE TO USING PAGE DESCRIPTION LANGUAGES

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Xerox 721P87491 manual Fill, Shapes

721P87491 specifications

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