Sets a coloured tiling pattern or a shading pattern as the stroke colour (/Pattern CS /name SCN).
public void SetStrokePattern(PdfPattern pattern)
A valid pattern of this document: a shading pattern, or a coloured tiling pattern.
ISO 32000-2 §8.7.3.2 and §8.7.4.2. As SetFillPattern(PdfPattern), for the stroking colour.