https://bugs.kde.org/show_bug.cgi?id=431631

--- Comment #4 from H.H. <cyberb...@gmx.de> ---
I now implemented something like that for jfreechart:

For my own gradient-renderer I give an array of gradient-colors and and array
of "Function2D" Objects, which deliver the stop points for each color in
dependency of a function of x (one function for each gradient-stop-point).

Then I draw a polygon for each sampled-function point, filled with that
gradient. To look good, there have to be enough sample points, and antialias
needs to be off for the polygons (else there are little background-gaps between
the polygons, not solved this problem for svg output unfortunately).

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