SVG不支持PostScript operator "strokepath"

hbghlyj

1. size(100);
2. axialshade((0,0)..controls(1,1)..(2,0),stroke=true,red,(0,0),green,(2,0));

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如果输出格式为 svg，Asymptote 将输出警告SVG does not support strokepath，不支持笔画渐变，因此在输出中，整个区域被渐变填充。
如果输出格式为pdf，则笔画的渐变是正确的。

Related: SVG渐变部分显示不正常
笔划转为可填充的轮廓: How to get the outline of a stroke? 其中也提到了PostScript operator strokepath

hbghlyj

Mathematica Graphics: Color Blend in BezierCurve

A simple line strip should be sufficient for most purposes and there you can use VertexColors as usual:

1. pts = {{0, 0}, {1, 1}, {2, 0}};
2. Graphics[{Thick,
3.   Line[BezierFunction[pts] /@ #,
4.     VertexColors -> (Blend[{Red, Green}, #] & /@ #)] &[Range[0, 1, .01]],
5.   Line[{{0, 0}, {2, 0}}, VertexColors -> {Red, Green}]}
6. ]

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