[Raku PDF Project] / [PDF-Class Module]
/ShadingType 1 - Functional
(Optional) An array of four numbers [ xmin xmax ymin ymax ] specifying the rectangular domain of coordinates over which the color function(s) are defined.
(Optional) An array of six numbers specifying a transformation matrix mapping the coordinate space specified by the Domain entry into the shading’s target coordinate space.
(Required) A 2-in, n-out function or an array of n 2-in, 1-out functions (where nis the number of color components in the shading dictionary’s color space)