Zhichu Chen wrote:

Seems that I don't have too many choices. Maybe using lua to do the
math and throwing the result to metapost is faster? I think I can do
this, but I don't know how. The documents are a little limited.

For circles, probably lua calculations will be faster because the
data manipulation will be a bit easier. But for non-circle paths,
you are better off with a metapost solution because of lua not
knowing about the actual paths.

Good luck,
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