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Minor tweak

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RonaldoCMP 2021-04-11 13:01:06 +01:00
parent 5062ee1605
commit dab6407b0f
1 changed files with 3 additions and 3 deletions
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geometry.scad
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@ -1772,7 +1772,7 @@ function furthest_point(pt, points) =
// area = polygon_area(poly); // area = polygon_area(poly);
// Description: // Description:
// Given a 2D or 3D planar polygon, returns the area of that polygon. // Given a 2D or 3D planar polygon, returns the area of that polygon.
// If the polygon is self-crossing, the results are undefined. For non-planar 3D polygon the result is undef. // If the polygon is self-crossing, the results are undefined. For non-planar 3D polygon the result is [].
// When `signed` is true, a signed area is returned; a positive area indicates a clockwise polygon. // When `signed` is true, a signed area is returned; a positive area indicates a clockwise polygon.
// Arguments: // Arguments:
// poly = Polygon to compute the area of. // poly = Polygon to compute the area of.
@ -1784,9 +1784,9 @@ function polygon_area(poly, signed=false) =
? let( total = sum([for(i=[1:1:len(poly)-2]) cross(poly[i]-poly[0],poly[i+1]-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) signed ? total : abs(total)
: let( plane = plane_from_polygon(poly) ) : let( plane = plane_from_polygon(poly) )
plane==undef? undef : plane==[]? [] :
let( let(
n = plane_normal(plane), n = plane_normal(plane),
total = sum([ total = sum([
for(i=[1:1:len(poly)-2]) for(i=[1:1:len(poly)-2])
let( let(