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SECTION 4.6                                                                 Patterns



pattern defines its own color information, no additional operands representing
color components are specified to SCN or scn. For example, if P1 is the name of a
pattern resource in the current resource dictionary, the following code establishes
it as the current nonstroking color:

  /Pattern cs
  /P1 scn

Subsequent executions of nonstroking painting operators, such as f (fill), Tj (show
text), or Do (paint external object) with an image mask, use the designated pat-
tern to tile the areas to be painted.

Example 4.23 defines a page (object 5) that paints three circles and a triangle
using a colored tiling pattern (object 15) over a yellow background. The pattern
consists of the symbols for the four suits of playing cards (spades, hearts, dia-
monds, and clubs), which are character glyphs taken from the ZapfDingbats font
(see Section D.5, “ZapfDingbats Set and Encoding”); the pattern’s content stream
specifies the color of each glyph. Plate 8 shows the results.

Example 4.23

  5 0 obj                                        % Page object
     << /Type /Page
         /Parent 2 0 R
         /Resources 10 0 R
         /Contents 30 0 R
         /CropBox [ 0 0 225 225 ]
     >>
  endobj

  10 0 obj                                       % Resource dictionary for page
     << /Pattern << /P1 15 0 R >>
     >>
  endobj

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