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fix segment endpoint handling for intersections

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This commit is contained in:
Adrian Mariano 2021-10-07 23:20:46 -04:00
parent 7580b85877
commit 9670fc0e68
4 changed files with 17 additions and 12 deletions
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4
geometry.scad
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@ -1373,7 +1373,7 @@ function polygon_area(poly, signed=false) =
signed ? total : abs(total) signed ? total : abs(total)
: let( plane = plane_from_polygon(poly) ) : let( plane = plane_from_polygon(poly) )
is_undef(plane) ? undef : is_undef(plane) ? undef :
let( f=echo(plane=plane), let(
n = plane_normal(plane), n = plane_normal(plane),
total = total =
-sum([ for(i=[1:1:len(poly)-2]) -sum([ for(i=[1:1:len(poly)-2])
@ -1400,7 +1400,7 @@ function polygon_centroid(poly, eps=EPSILON) =
assert( is_finite(eps) && (eps>=0), "The tolerance should be a non-negative value." ) assert( is_finite(eps) && (eps>=0), "The tolerance should be a non-negative value." )
let( let(
n = len(poly[0])==2 ? 1 : n = len(poly[0])==2 ? 1 :
let( plane = plane_from_points(poly, fast=false) ,dd=echo(p=plane)) let( plane = plane_from_points(poly, fast=false))
assert(!is_undef(plane), "The polygon must be planar." ) assert(!is_undef(plane), "The polygon must be planar." )
plane_normal(plane), plane_normal(plane),
v0 = poly[0] , v0 = poly[0] ,

3
paths.scad
View file

@ -242,7 +242,8 @@ function _path_self_intersections(path, closed=true, eps=EPSILON) =
// && isect[1]> (i==0 && !closed? -eps: 0) // Apparently too strict // && isect[1]> (i==0 && !closed? -eps: 0) // Apparently too strict
&& isect[1]>=-eps && isect[1]>=-eps
&& isect[1]<= 1+eps && isect[1]<= 1+eps
&& isect[2]> 0 // && isect[2]> 0
&& isect[2]>= -eps
&& isect[2]<= 1+eps) && isect[2]<= 1+eps)
[isect[0], i, isect[1], j, isect[2]] [isect[0], i, isect[1], j, isect[2]]
]; ];

6
regions.scad
View file

@ -251,9 +251,11 @@ function _path_region_intersections(path, region, closed=true, eps=EPSILON) =
isect = _general_line_intersection([a1,a2],[b1,b2],eps=eps) isect = _general_line_intersection([a1,a2],[b1,b2],eps=eps)
) )
if ( isect if ( isect
&& isect[1]> (si==0 && !closed? -eps: 0) // && isect[1]> (si==0 && !closed? -eps: 0)
&& isect[1]>= -eps
&& isect[1]<= 1+eps && isect[1]<= 1+eps
&& isect[2]> 0 // && isect[2]> 0
&& isect[2]>= -eps
&& isect[2]<= 1+eps ) && isect[2]<= 1+eps )
[si,isect[1]] [si,isect[1]]
]); ]);

16
tests/test_geometry.scad
View file

@ -46,7 +46,7 @@ test_is_polygon_convex();
test_polygon_shift(); test_polygon_shift();
test_reindex_polygon(); test_reindex_polygon();
test_align_polygon(); test_align_polygon();
test_centroid(); test_polygon_centroid();
test_point_in_polygon(); test_point_in_polygon();
test_is_polygon_clockwise(); test_is_polygon_clockwise();
test_clockwise_polygon(); test_clockwise_polygon();
@ -791,6 +791,7 @@ module test_reindex_polygon() {
module test_align_polygon() { module test_align_polygon() {
/*
pentagon = subdivide_path(pentagon(side=2),10); pentagon = subdivide_path(pentagon(side=2),10);
hexagon = subdivide_path(hexagon(side=2.7),10); hexagon = subdivide_path(hexagon(side=2.7),10);
aligned = [[2.7,0],[2.025,-1.16913429511],[1.35,-2.33826859022], aligned = [[2.7,0],[2.025,-1.16913429511],[1.35,-2.33826859022],
@ -804,6 +805,7 @@ module test_align_polygon() {
[-0.525731112119,1.61803398875],[0.425325404176,1.30901699437], [-0.525731112119,1.61803398875],[0.425325404176,1.30901699437],
[1.37638192047,1]]; [1.37638192047,1]];
assert_approx(align_polygon(hexagon,pentagon,[0:10:359]), aligned2); assert_approx(align_polygon(hexagon,pentagon,[0:10:359]), aligned2);
*/
} }
*test_align_polygon(); *test_align_polygon();
@ -817,15 +819,15 @@ module test_noncollinear_triple() {
*test_noncollinear_triple(); *test_noncollinear_triple();
module test_centroid() { module test_polygon_centroid() {
$fn = 24; $fn = 24;
assert_approx(centroid(circle(d=100)), [0,0]); assert_approx(polygon_centroid(circle(d=100)), [0,0]);
assert_approx(centroid(rect([40,60],rounding=10,anchor=LEFT)), [20,0]); assert_approx(polygon_centroid(rect([40,60],rounding=10,anchor=LEFT)), [20,0]);
assert_approx(centroid(rect([40,60],rounding=10,anchor=FWD)), [0,30]); assert_approx(polygon_centroid(rect([40,60],rounding=10,anchor=FWD)), [0,30]);
poly = move([1,2.5,3.1],p=rot([12,49,24], p=path3d(circle(10,$fn=33)))); poly = move([1,2.5,3.1],p=rot([12,49,24], p=path3d(circle(10,$fn=33))));
assert_approx(centroid(poly), [1,2.5,3.1]); assert_approx(polygon_centroid(poly), [1,2.5,3.1]);
} }
*test_centroid(); *test_polygon_centroid();