From Newsgroup: comp.lang.postscript

I have published an initial stab at a 2D graphical API for GXScript here <https://bitbucket.org/ldo17/gxscript_extensions/>. I am calling that
language extension rCLToastScriptrCY.

I have done away with all the old-style PostScript colour operators.
Instead, colours are now objects in their own right. You construct one of these with the rCLmakecolourrCY operator, which takes as operand a dictionary specifying the parameters of the colour, in any of a number of different colour spaces. For example, to define a colour in HSV space, you could do

<< /h 0.25 /s 0.5 /v 1 >> makecolour

Patterns are also done in an entirely different way: instead of being able
to execute arbitrary PostScript code, they are restricted to the types of patterns supported by Cairo. For example, this is a linear gradient
pattern:

<<
/p0 [0 0]
/p1 [1 1]
/stops
[
[0 << /h 0.25 /s 0.5 /v 1 >> makecolour]
[1 << /h 0.75 /s 0.5 /v 1 >> makecolour]
]
/matrix 90 90 matrix .scale .inv
>>
makepattern

Vectors and matrices are also objects in their own right, |a la my Qahirah wrapper for cairo. Note the dot-operators to invoke method names that are scoped to the object.
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