Paints a shading over the current clipping region (sh), in the current user space.
public void PaintShading(PdfShading shading)
A valid shading of this document, such as one CreateAxialShading(PathPoint, PathPoint, IReadOnlyList<PdfGradientStop>, PdfShadingOptions?) creates.
ISO 32000-2 §8.7.4.2 (sh, PDF 1.3) and Table 77: the shading's coordinates are in the current user space, its
Background is ignored and its BBox clips. The whole clipping region is painted, so set a clip first to shade one
area. The shading is named in the Shading resources. An uncoloured tiling pattern's cell shall not paint a shading
(§8.7.3.3). Records PDF 1.3.