This class represents the pattern dictionary. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; page 173.

The pattern element is the abstract base for PDF pattern types. Patterns allow a painting operation to fill or stroke with a repeating or algorithmically generated design rather than a flat color.

PDF defines two pattern types: Type 1 tiling patterns, which repeat a content stream in a regular grid, and Type 2 shading patterns, which paint a smooth colour gradient without tiling.

Patterns are stored as named resources in a resource dictionary under the Pattern entry. A content stream selects a pattern by setting the current color space to a Pattern space and then invoking a color-setting operator with the pattern name.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.PatternElement
          WebSupergoo.ABCpdf14.Elements.Type1PatternElement
          WebSupergoo.ABCpdf14.Elements.Type2PatternElement