shaped angular gradient math

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Hi. This is a purely educational question, but which file in the source
code contains the formula / algorithm that decides how to paint your
shaped angular gradients? I noticed that gimp allows you to a select any
arbitrary area on the canvas and fit a gradient to it in Shaped mode,
and I was curious what formula was used to calculate the point / color
distribution. I downloaded recent source code, but I am admittedly
rather lost, finding lots of gradient-related interface code but not
what I am looking for.

-- 
frigidcode.com
indicium.us

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