[metapost] Better gradient and 'special'

[Hans Hagen]

Jesús Guillermo Andrade wrote:
> Hans: You mean using ps directly through an "special"?

no, just let info travel to the output and then postprocess the output 
(gradients and such are mostly a matter of managing resources)

(see http://www.pragma-ade.com/show-man.pdf and esp the metafun manual 
for examples of output)

Hans

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