Filter
Top Products
PostScript
1-24 Guide to Using Page Description Languages
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).
Zero-width lines (strokes)
Zero-width lines are lines that have a line width set to zero by the
PostScript master. These lines may not image. The best method
is to specify the sizes of the hairline you want, such as .24
setlinewidth
instead of 0
setlinewidth
.