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Remove triangle_area (because polygon_area)

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This commit is contained in:
Adrian Mariano 2021-09-10 18:02:56 -04:00
parent 1920014f86
commit 566d9b4ece
2 changed files with 9 additions and 12 deletions
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9
geometry.scad
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@ -1689,9 +1689,10 @@ function furthest_point(pt, points) =
// area = polygon_area(poly);
// Topics: Geometry, Polygons, Area
// Description:
// 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`.
// When `signed` is true, a signed area is returned; a positive area indicates a clockwise polygon.
// Given a 2D or 3D simple planar polygon, returns the area of that polygon.
// If the polygon is self-intersecting or non-planar, the result is `undef.`
// When `signed` is true and the polygon is 2d, a signed area is returned: a positive area indicates a counter-clockwise polygon.
// The area of 3d polygons is always nonnegative.
// Arguments:
// poly = Polygon to compute the area of.
// signed = If true, a signed area is returned. Default: false.
@ -1706,7 +1707,7 @@ function polygon_area(poly, signed=false) =
let(
n = plane_normal(plane),
total =
sum([ for(i=[1:1:len(poly)-2])
-sum([ for(i=[1:1:len(poly)-2])
cross(poly[i]-poly[0], poly[i+1]-poly[0])
]) * n/2
)

12
tests/test_geometry.scad
View file

@ -32,7 +32,6 @@ test_tri_calc();
//test_hyp_adj_to_ang();
//test_hyp_opp_to_ang();
//test_adj_opp_to_ang();
test_triangle_area();
test_plane3pt();
test_plane3pt_indexed();
test_plane_from_normal();
@ -649,13 +648,6 @@ module test_hyp_opp_to_ang() nil(); // Covered in test_tri_functions()
module test_adj_opp_to_ang() nil(); // Covered in test_tri_functions()
module test_triangle_area() {
assert(abs(triangle_area([0,0], [0,10], [10,0]) + 50) < EPSILON);
assert(abs(triangle_area([0,0], [0,10], [0,15])) < EPSILON);
assert(abs(triangle_area([0,0], [10,0], [0,10]) - 50) < EPSILON);
}
*test_triangle_area();
module test_plane3pt() {
assert_approx(plane3pt([0,0,20], [0,10,10], [0,0,0]), [1,0,0,0]);
@ -817,6 +809,10 @@ module test_polygon_area() {
assert(approx(polygon_area(rot([13,27,75],
p=path3d(circle(r=50,$fn=1000),fill=23)),
signed=true), -PI*50*50, eps=0.1));
assert(abs(triangle_area([0,0], [0,10], [10,0]) + 50) < EPSILON);
assert(abs(triangle_area([0,0], [0,10], [0,15])) < EPSILON);
assert(abs(triangle_area([0,0], [10,0], [0,10]) - 50) < EPSILON);
}
*test_polygon_area();