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err message tweak in star()

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rearranged polygon_line_intersection to handle 2d and fixed
but where it didn't test polygon membership correctly.  Also
there was a bug with use of the bounded argument.
Added Ronaldo's triangulation.
This commit is contained in:
Adrian Mariano
2021-09-13 22:09:51 -04:00
parent 02d874cf65
commit 5a4d9554df
4 changed files with 266 additions and 91 deletions
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shapes2d.scad
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@@ -1563,7 +1563,7 @@ function star(n, r, ir, d, or, od, id, step, realign=false, align_tip, align_pit
)
assert(is_def(n), "Must specify number of points, n")
assert(count==1, "Must specify exactly one of ir, id, step")
assert(stepOK, str("Parameter 'step' must be between 2 and ",floor(n/2)," for ",n," point star"))
assert(stepOK, str("Parameter 'step' must be between 2 and ",floor(n/2-1/2)," for ",n," point star"))
let(
mat = !is_undef(_mat) ? _mat :
( realign? rot(-180/n, planar=true) : affine2d_identity() ) * (