pub fn fan_offset(along: f32, across: f32, umbra: f32, radius: f32) -> f32Expand description
The length of the offset Skia’s corner fan interpolates at along and
across, a point’s distances out from the umbra’s corner toward the two
edges, for an umbra inset umbra and a corner radius radius: 0 at the
umbra and 1 on the outer edge. The fan’s triangles meet the edge at the
umbra line, at umbra - radius along it and at the corner, whose offsets
Skia skews when the umbra is deeper than the radius.