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usage message fixes and doc tweaks

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remove triangle area, optimize polygon_area for triangles
This commit is contained in:
Adrian Mariano
2022-04-08 19:37:46 -04:00
parent cca4fad3ef
commit 82aa485045
14 changed files with 904 additions and 847 deletions
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3
geometry.scad
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@@ -1358,6 +1358,9 @@ function sphere_line_intersection(r, cp, line, bounded=false, d, eps=EPSILON) =
function polygon_area(poly, signed=false) =
assert(is_path(poly), "Invalid polygon." )
len(poly)<3 ? 0 :
len(poly)==3 ?
let( total= len(poly[0])==2 ? 0.5*cross(poly[2]-poly[0],poly[2]-poly[1]) : 0.5*norm(cross(poly[2]-poly[0],poly[2]-poly[1])))
signed ? total : abs(total) :
len(poly[0])==2
? let( total = sum([for(i=[1:1:len(poly)-2]) cross(poly[i]-poly[0],poly[i+1]-poly[0]) ])/2 )
signed ? total : abs(total)