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e455ca2f2f
godot/tests/test_geometry_2d.h
Marcus Brummer e455ca2f2f Added Geometry2D unit tests
2020-12-30 21:11:09 +01:00

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/*************************************************************************/
/* test_geometry_2d.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
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/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/
#ifndef TEST_GEOMETRY_2D_H
#define TEST_GEOMETRY_2D_H
#include "core/math/geometry_2d.h"
#include "core/templates/vector.h"
#include "thirdparty/doctest/doctest.h"
namespace TestGeometry2D {
TEST_CASE("[Geometry2D] Point in circle") {
CHECK(Geometry2D::is_point_in_circle(Vector2(0, 0), Vector2(0, 0), 1.0));
CHECK(Geometry2D::is_point_in_circle(Vector2(0, 0), Vector2(11.99, 0), 12));
CHECK(Geometry2D::is_point_in_circle(Vector2(-11.99, 0), Vector2(0, 0), 12));
CHECK_FALSE(Geometry2D::is_point_in_circle(Vector2(0, 0), Vector2(12.01, 0), 12));
CHECK_FALSE(Geometry2D::is_point_in_circle(Vector2(-12.01, 0), Vector2(0, 0), 12));
CHECK(Geometry2D::is_point_in_circle(Vector2(7, -42), Vector2(4, -40), 3.7));
CHECK_FALSE(Geometry2D::is_point_in_circle(Vector2(7, -42), Vector2(4, -40), 3.5));
// This tests points on the edge of the circle. They are treated as beeing inside the circle.
// In `is_point_in_triangle` and `is_point_in_polygon` they are treated as being outside, so in order the make
// the behaviour consistent this may change in the future (see issue #44717 and PR #44274).
CHECK(Geometry2D::is_point_in_circle(Vector2(1.0, 0.0), Vector2(0, 0), 1.0));
CHECK(Geometry2D::is_point_in_circle(Vector2(0.0, -1.0), Vector2(0, 0), 1.0));
}
TEST_CASE("[Geometry2D] Point in triangle") {
CHECK(Geometry2D::is_point_in_triangle(Vector2(0, 0), Vector2(-1, 1), Vector2(0, -1), Vector2(1, 1)));
CHECK_FALSE(Geometry2D::is_point_in_triangle(Vector2(-1.01, 1.0), Vector2(-1, 1), Vector2(0, -1), Vector2(1, 1)));
CHECK(Geometry2D::is_point_in_triangle(Vector2(3, 2.5), Vector2(1, 4), Vector2(3, 2), Vector2(5, 4)));
CHECK(Geometry2D::is_point_in_triangle(Vector2(-3, -2.5), Vector2(-1, -4), Vector2(-3, -2), Vector2(-5, -4)));
CHECK_FALSE(Geometry2D::is_point_in_triangle(Vector2(0, 0), Vector2(1, 4), Vector2(3, 2), Vector2(5, 4)));
// This tests points on the edge of the triangle. They are treated as beeing outside the triangle.
// In `is_point_in_circle` they are treated as being inside, so in order the make
// the behaviour consistent this may change in the future (see issue #44717 and PR #44274).
CHECK_FALSE(Geometry2D::is_point_in_triangle(Vector2(1, 1), Vector2(-1, 1), Vector2(0, -1), Vector2(1, 1)));
CHECK_FALSE(Geometry2D::is_point_in_triangle(Vector2(0, 1), Vector2(-1, 1), Vector2(0, -1), Vector2(1, 1)));
}
TEST_CASE("[Geometry2D] Point in polygon") {
Vector<Vector2> p;
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(0, 0), p));
p.push_back(Vector2(-88, 120));
p.push_back(Vector2(-74, -38));
p.push_back(Vector2(135, -145));
p.push_back(Vector2(425, 70));
p.push_back(Vector2(68, 112));
p.push_back(Vector2(-120, 370));
p.push_back(Vector2(-323, -145));
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(-350, 0), p));
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(-110, 60), p));
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(412, 96), p));
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(83, 130), p));
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(-320, -153), p));
CHECK(Geometry2D::is_point_in_polygon(Vector2(0, 0), p));
CHECK(Geometry2D::is_point_in_polygon(Vector2(-230, 0), p));
CHECK(Geometry2D::is_point_in_polygon(Vector2(130, -110), p));
CHECK(Geometry2D::is_point_in_polygon(Vector2(370, 55), p));
CHECK(Geometry2D::is_point_in_polygon(Vector2(-160, 190), p));
// This tests points on the edge of the polygon. They are treated as beeing outside the polygon.
// In `is_point_in_circle` they are treated as being inside, so in order the make
// the behaviour consistent this may change in the future (see issue #44717 and PR #44274).
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(68, 112), p));
CHECK_FALSE(Geometry2D::is_point_in_polygon(Vector2(-88, 120), p));
}
TEST_CASE("[Geometry2D] Polygon clockwise") {
Vector<Vector2> p;
CHECK_FALSE(Geometry2D::is_polygon_clockwise(p));
p.push_back(Vector2(5, -5));
p.push_back(Vector2(-1, -5));
p.push_back(Vector2(-5, -1));
p.push_back(Vector2(-1, 3));
p.push_back(Vector2(1, 5));
CHECK(Geometry2D::is_polygon_clockwise(p));
p.invert();
CHECK_FALSE(Geometry2D::is_polygon_clockwise(p));
}
TEST_CASE("[Geometry2D] Line intersection") {
Vector2 r;
CHECK(Geometry2D::line_intersects_line(Vector2(2, 0), Vector2(0, 1), Vector2(0, 2), Vector2(1, 0), r));
CHECK(r.is_equal_approx(Vector2(2, 2)));
CHECK(Geometry2D::line_intersects_line(Vector2(-1, 1), Vector2(1, -1), Vector2(4, 1), Vector2(-1, -1), r));
CHECK(r.is_equal_approx(Vector2(1.5, -1.5)));
CHECK(Geometry2D::line_intersects_line(Vector2(-1, 0), Vector2(-1, -1), Vector2(1, 0), Vector2(1, -1), r));
CHECK(r.is_equal_approx(Vector2(0, 1)));
CHECK_FALSE_MESSAGE(
Geometry2D::line_intersects_line(Vector2(-1, 1), Vector2(1, -1), Vector2(0, 1), Vector2(1, -1), r),
"Parallel lines should not intersect.");
}
TEST_CASE("[Geometry2D] Segment intersection.") {
Vector2 r;
CHECK(Geometry2D::segment_intersects_segment(Vector2(-1, 1), Vector2(1, -1), Vector2(1, 1), Vector2(-1, -1), &r));
CHECK(r.is_equal_approx(Vector2(0, 0)));
CHECK_FALSE(Geometry2D::segment_intersects_segment(Vector2(-1, 1), Vector2(1, -1), Vector2(1, 1), Vector2(0.1, 0.1), &r));
CHECK_FALSE_MESSAGE(
Geometry2D::segment_intersects_segment(Vector2(-1, 1), Vector2(1, -1), Vector2(0, 1), Vector2(1, -1), &r),
"Parallel segments should not intersect.");
}
TEST_CASE("[Geometry2D] Closest point to segment") {
Vector2 s[] = { Vector2(-4, -4), Vector2(4, 4) };
CHECK(Geometry2D::get_closest_point_to_segment(Vector2(4.1, 4.1), s).is_equal_approx(Vector2(4, 4)));
CHECK(Geometry2D::get_closest_point_to_segment(Vector2(-4.1, -4.1), s).is_equal_approx(Vector2(-4, -4)));
CHECK(Geometry2D::get_closest_point_to_segment(Vector2(-1, 1), s).is_equal_approx(Vector2(0, 0)));
}
TEST_CASE("[Geometry2D] Closest point to uncapped segment") {
Vector2 s[] = { Vector2(-4, -4), Vector2(4, 4) };
CHECK(Geometry2D::get_closest_point_to_segment_uncapped(Vector2(-1, 1), s).is_equal_approx(Vector2(0, 0)));
CHECK(Geometry2D::get_closest_point_to_segment_uncapped(Vector2(-4, -6), s).is_equal_approx(Vector2(-5, -5)));
CHECK(Geometry2D::get_closest_point_to_segment_uncapped(Vector2(4, 6), s).is_equal_approx(Vector2(5, 5)));
}
TEST_CASE("[Geometry2D] Closest points between segments") {
Vector2 c1, c2;
Geometry2D::get_closest_points_between_segments(Vector2(2, 2), Vector2(3, 3), Vector2(4, 4), Vector2(4, 5), c1, c2);
CHECK(c1.is_equal_approx(Vector2(3, 3)));
CHECK(c2.is_equal_approx(Vector2(4, 4)));
Geometry2D::get_closest_points_between_segments(Vector2(0, 1), Vector2(-2, -1), Vector2(0, 0), Vector2(2, -2), c1, c2);
CHECK(c1.is_equal_approx(Vector2(-0.5, 0.5)));
CHECK(c2.is_equal_approx(Vector2(0, 0)));
Geometry2D::get_closest_points_between_segments(Vector2(-1, 1), Vector2(1, -1), Vector2(1, 1), Vector2(-1, -1), c1, c2);
CHECK(c1.is_equal_approx(Vector2(0, 0)));
CHECK(c2.is_equal_approx(Vector2(0, 0)));
}
TEST_CASE("[Geometry2D] Make atlas") {
Vector<Point2i> result;
Size2i size;
Vector<Size2i> r;
r.push_back(Size2i(2, 2));
Geometry2D::make_atlas(r, result, size);
CHECK(size == Size2i(2, 2));
CHECK(result.size() == r.size());
r.clear();
result.clear();
r.push_back(Size2i(1, 2));
r.push_back(Size2i(3, 4));
r.push_back(Size2i(5, 6));
r.push_back(Size2i(7, 8));
Geometry2D::make_atlas(r, result, size);
CHECK(result.size() == r.size());
}
TEST_CASE("[Geometry2D] Polygon intersection") {
Vector<Point2> a;
Vector<Point2> b;
Vector<Vector<Point2>> r;
a.push_back(Point2(30, 60));
a.push_back(Point2(70, 5));
a.push_back(Point2(200, 40));
a.push_back(Point2(80, 200));
SUBCASE("[Geometry2D] Both polygons are empty") {
r = Geometry2D::intersect_polygons(Vector<Point2>(), Vector<Point2>());
CHECK_MESSAGE(r.is_empty(), "Both polygons are empty. The intersection should also be empty.");
}
SUBCASE("[Geometry2D] One polygon is empty") {
r = Geometry2D::intersect_polygons(a, b);
REQUIRE_MESSAGE(r.is_empty(), "One polygon is empty. The intersection should also be empty.");
}
SUBCASE("[Geometry2D] Basic intersection") {
b.push_back(Point2(200, 300));
b.push_back(Point2(90, 200));
b.push_back(Point2(50, 100));
b.push_back(Point2(200, 90));
r = Geometry2D::intersect_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 1, "The polygons should intersect each other with 1 resulting intersection polygon.");
REQUIRE_MESSAGE(r[0].size() == 3, "The resulting intersection polygon should have 3 vertices.");
CHECK(r[0][0].is_equal_approx(Point2(86.52174, 191.30436)));
CHECK(r[0][1].is_equal_approx(Point2(50, 100)));
CHECK(r[0][2].is_equal_approx(Point2(160.52632, 92.63157)));
}
SUBCASE("[Geometry2D] Intersection with one polygon beeing completly inside the other polygon") {
b.push_back(Point2(80, 100));
b.push_back(Point2(50, 50));
b.push_back(Point2(150, 50));
r = Geometry2D::intersect_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 1, "The polygons should intersect each other with 1 resulting intersection polygon.");
REQUIRE_MESSAGE(r[0].size() == 3, "The resulting intersection polygon should have 3 vertices.");
CHECK(r[0][0].is_equal_approx(b[0]));
CHECK(r[0][1].is_equal_approx(b[1]));
CHECK(r[0][2].is_equal_approx(b[2]));
}
SUBCASE("[Geometry2D] No intersection with 2 non-empty polygons") {
b.push_back(Point2(150, 150));
b.push_back(Point2(250, 100));
b.push_back(Point2(300, 200));
r = Geometry2D::intersect_polygons(a, b);
REQUIRE_MESSAGE(r.is_empty(), "The polygons should not intersect each other.");
}
SUBCASE("[Geometry2D] Intersection with 2 resulting polygons") {
a.clear();
a.push_back(Point2(70, 5));
a.push_back(Point2(140, 7));
a.push_back(Point2(100, 52));
a.push_back(Point2(170, 50));
a.push_back(Point2(60, 125));
b.push_back(Point2(70, 105));
b.push_back(Point2(115, 55));
b.push_back(Point2(90, 15));
b.push_back(Point2(160, 50));
r = Geometry2D::intersect_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 2, "The polygons should intersect each other with 2 resulting intersection polygons.");
REQUIRE_MESSAGE(r[0].size() == 4, "The resulting intersection polygon should have 4 vertices.");
CHECK(r[0][0].is_equal_approx(Point2(70, 105)));
CHECK(r[0][1].is_equal_approx(Point2(115, 55)));
CHECK(r[0][2].is_equal_approx(Point2(112.894737, 51.63158)));
CHECK(r[0][3].is_equal_approx(Point2(159.509537, 50.299728)));
REQUIRE_MESSAGE(r[1].size() == 3, "The intersection polygon should have 3 vertices.");
CHECK(r[1][0].is_equal_approx(Point2(119.692307, 29.846149)));
CHECK(r[1][1].is_equal_approx(Point2(107.706421, 43.33028)));
CHECK(r[1][2].is_equal_approx(Point2(90, 15)));
}
}
TEST_CASE("[Geometry2D] Merge polygons") {
Vector<Point2> a;
Vector<Point2> b;
Vector<Vector<Point2>> r;
a.push_back(Point2(225, 180));
a.push_back(Point2(160, 230));
a.push_back(Point2(20, 212));
a.push_back(Point2(50, 115));
SUBCASE("[Geometry2D] Both polygons are empty") {
r = Geometry2D::merge_polygons(Vector<Point2>(), Vector<Point2>());
REQUIRE_MESSAGE(r.is_empty(), "Both polygons are empty. The union should also be empty.");
}
SUBCASE("[Geometry2D] One polygon is empty") {
r = Geometry2D::merge_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 1, "One polygon is non-empty. There should be 1 resulting merged polygon.");
REQUIRE_MESSAGE(r[0].size() == 4, "The resulting merged polygon should have 4 vertices.");
CHECK(r[0][0].is_equal_approx(a[0]));
CHECK(r[0][1].is_equal_approx(a[1]));
CHECK(r[0][2].is_equal_approx(a[2]));
CHECK(r[0][3].is_equal_approx(a[3]));
}
SUBCASE("[Geometry2D] Basic merge with 2 polygons") {
b.push_back(Point2(180, 190));
b.push_back(Point2(60, 140));
b.push_back(Point2(160, 80));
r = Geometry2D::merge_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 1, "The merged polygons should result in 1 polygon.");
REQUIRE_MESSAGE(r[0].size() == 7, "The resulting merged polygon should have 7 vertices.");
CHECK(r[0][0].is_equal_approx(Point2(174.791077, 161.350967)));
CHECK(r[0][1].is_equal_approx(Point2(225, 180)));
CHECK(r[0][2].is_equal_approx(Point2(160, 230)));
CHECK(r[0][3].is_equal_approx(Point2(20, 212)));
CHECK(r[0][4].is_equal_approx(Point2(50, 115)));
CHECK(r[0][5].is_equal_approx(Point2(81.911758, 126.852943)));
CHECK(r[0][6].is_equal_approx(Point2(160, 80)));
}
SUBCASE("[Geometry2D] Merge with 2 resulting merged polygons (outline and hole)") {
b.push_back(Point2(180, 190));
b.push_back(Point2(140, 125));
b.push_back(Point2(60, 140));
b.push_back(Point2(160, 80));
r = Geometry2D::merge_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 2, "The merged polygons should result in 2 polygons.");
REQUIRE_MESSAGE(!Geometry2D::is_polygon_clockwise(r[0]), "The merged polygon (outline) should be counter-clockwise.");
REQUIRE_MESSAGE(r[0].size() == 7, "The resulting merged polygon (outline) should have 7 vertices.");
CHECK(r[0][0].is_equal_approx(Point2(174.791077, 161.350967)));
CHECK(r[0][1].is_equal_approx(Point2(225, 180)));
CHECK(r[0][2].is_equal_approx(Point2(160, 230)));
CHECK(r[0][3].is_equal_approx(Point2(20, 212)));
CHECK(r[0][4].is_equal_approx(Point2(50, 115)));
CHECK(r[0][5].is_equal_approx(Point2(81.911758, 126.852943)));
CHECK(r[0][6].is_equal_approx(Point2(160, 80)));
REQUIRE_MESSAGE(Geometry2D::is_polygon_clockwise(r[1]), "The resulting merged polygon (hole) should be clockwise.");
REQUIRE_MESSAGE(r[1].size() == 3, "The resulting merged polygon (hole) should have 3 vertices.");
CHECK(r[1][0].is_equal_approx(Point2(98.083069, 132.859421)));
CHECK(r[1][1].is_equal_approx(Point2(158.689453, 155.370377)));
CHECK(r[1][2].is_equal_approx(Point2(140, 125)));
}
}
TEST_CASE("[Geometry2D] Clip polygons") {
Vector<Point2> a;
Vector<Point2> b;
Vector<Vector<Point2>> r;
a.push_back(Point2(225, 180));
a.push_back(Point2(160, 230));
a.push_back(Point2(20, 212));
a.push_back(Point2(50, 115));
SUBCASE("[Geometry2D] Both polygons are empty") {
r = Geometry2D::clip_polygons(Vector<Point2>(), Vector<Point2>());
CHECK_MESSAGE(r.is_empty(), "Both polygons are empty. The clip should also be empty.");
}
SUBCASE("[Geometry2D] Basic clip with one result polygon") {
b.push_back(Point2(250, 170));
b.push_back(Point2(175, 270));
b.push_back(Point2(120, 260));
b.push_back(Point2(25, 80));
r = Geometry2D::clip_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 1, "The clipped polygons should result in 1 polygon.");
REQUIRE_MESSAGE(r[0].size() == 3, "The resulting clipped polygon should have 3 vertices.");
CHECK(r[0][0].is_equal_approx(Point2(100.102173, 222.298843)));
CHECK(r[0][1].is_equal_approx(Point2(20, 212)));
CHECK(r[0][2].is_equal_approx(Point2(47.588089, 122.798492)));
}
SUBCASE("[Geometry2D] Polygon b completely overlaps polygon a") {
b.push_back(Point2(250, 170));
b.push_back(Point2(175, 270));
b.push_back(Point2(10, 210));
b.push_back(Point2(55, 80));
r = Geometry2D::clip_polygons(a, b);
CHECK_MESSAGE(r.is_empty(), "Polygon 'b' completely overlaps polygon 'a'. This should result in no clipped polygons.");
}
SUBCASE("[Geometry2D] Polygon a completely overlaps polygon b") {
b.push_back(Point2(150, 200));
b.push_back(Point2(65, 190));
b.push_back(Point2(80, 140));
r = Geometry2D::clip_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 2, "Polygon 'a' completely overlaps polygon 'b'. This should result in 2 clipped polygons.");
REQUIRE_MESSAGE(r[0].size() == 4, "The resulting clipped polygon should have 4 vertices.");
REQUIRE_MESSAGE(!Geometry2D::is_polygon_clockwise(r[0]), "The resulting clipped polygon (outline) should be counter-clockwise.");
CHECK(r[0][0].is_equal_approx(a[0]));
CHECK(r[0][1].is_equal_approx(a[1]));
CHECK(r[0][2].is_equal_approx(a[2]));
CHECK(r[0][3].is_equal_approx(a[3]));
REQUIRE_MESSAGE(r[1].size() == 3, "The resulting clipped polygon should have 3 vertices.");
REQUIRE_MESSAGE(Geometry2D::is_polygon_clockwise(r[1]), "The resulting clipped polygon (hole) should be clockwise.");
CHECK(r[1][0].is_equal_approx(b[1]));
CHECK(r[1][1].is_equal_approx(b[0]));
CHECK(r[1][2].is_equal_approx(b[2]));
}
}
TEST_CASE("[Geometry2D] Exclude polygons") {
Vector<Point2> a;
Vector<Point2> b;
Vector<Vector<Point2>> r;
a.push_back(Point2(225, 180));
a.push_back(Point2(160, 230));
a.push_back(Point2(20, 212));
a.push_back(Point2(50, 115));
SUBCASE("[Geometry2D] Both polygons are empty") {
r = Geometry2D::exclude_polygons(Vector<Point2>(), Vector<Point2>());
CHECK_MESSAGE(r.is_empty(), "Both polygons are empty. The excluded polygon should also be empty.");
}
SUBCASE("[Geometry2D] One polygon is empty") {
r = Geometry2D::exclude_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 1, "One polygon is non-empty. There should be 1 resulting excluded polygon.");
REQUIRE_MESSAGE(r[0].size() == 4, "The resulting excluded polygon should have 4 vertices.");
CHECK(r[0][0].is_equal_approx(a[0]));
CHECK(r[0][1].is_equal_approx(a[1]));
CHECK(r[0][2].is_equal_approx(a[2]));
CHECK(r[0][3].is_equal_approx(a[3]));
}
SUBCASE("[Geometry2D] Exclude with 2 resulting polygons (outline and hole)") {
b.push_back(Point2(140, 160));
b.push_back(Point2(150, 220));
b.push_back(Point2(40, 200));
b.push_back(Point2(60, 140));
r = Geometry2D::exclude_polygons(a, b);
REQUIRE_MESSAGE(r.size() == 2, "There should be 2 resulting excluded polygons (outline and hole).");
REQUIRE_MESSAGE(r[0].size() == 4, "The resulting excluded polygon should have 4 vertices.");
REQUIRE_MESSAGE(!Geometry2D::is_polygon_clockwise(r[0]), "The resulting excluded polygon (outline) should be counter-clockwise.");
CHECK(r[0][0].is_equal_approx(a[0]));
CHECK(r[0][1].is_equal_approx(a[1]));
CHECK(r[0][2].is_equal_approx(a[2]));
CHECK(r[0][3].is_equal_approx(a[3]));
REQUIRE_MESSAGE(r[1].size() == 4, "The resulting excluded polygon should have 4 vertices.");
REQUIRE_MESSAGE(Geometry2D::is_polygon_clockwise(r[1]), "The resulting excluded polygon (hole) should be clockwise.");
CHECK(r[1][0].is_equal_approx(Point2(40, 200)));
CHECK(r[1][1].is_equal_approx(Point2(150, 220)));
CHECK(r[1][2].is_equal_approx(Point2(140, 160)));
CHECK(r[1][3].is_equal_approx(Point2(60, 140)));
}
}
TEST_CASE("[Geometry2D] Intersect polyline with polygon") {
Vector<Vector2> l;
Vector<Vector2> p;
Vector<Vector<Point2>> r;
l.push_back(Vector2(100, 90));
l.push_back(Vector2(120, 250));
p.push_back(Vector2(225, 180));
p.push_back(Vector2(160, 230));
p.push_back(Vector2(20, 212));
p.push_back(Vector2(50, 115));
SUBCASE("[Geometry2D] Both line and polygon are empty") {
r = Geometry2D::intersect_polyline_with_polygon(Vector<Vector2>(), Vector<Vector2>());
CHECK_MESSAGE(r.is_empty(), "Both line and polygon are empty. The intersection line should also be empty.");
}
SUBCASE("[Geometry2D] Line is non-empty and polygon is empty") {
r = Geometry2D::intersect_polyline_with_polygon(l, Vector<Vector2>());
CHECK_MESSAGE(r.is_empty(), "The polygon is empty while the line is non-empty. The intersection line should be empty.");
}
SUBCASE("[Geometry2D] Basic intersection with 1 resulting intersection line") {
r = Geometry2D::intersect_polyline_with_polygon(l, p);
REQUIRE_MESSAGE(r.size() == 1, "There should be 1 resulting intersection line.");
REQUIRE_MESSAGE(r[0].size() == 2, "The resulting intersection line should have 2 vertices.");
CHECK(r[0][0].is_equal_approx(Vector2(105.711609, 135.692886)));
CHECK(r[0][1].is_equal_approx(Vector2(116.805809, 224.446457)));
}
SUBCASE("[Geometry2D] Complex intersection with 2 resulting intersection lines") {
l.clear();
l.push_back(Vector2(100, 90));
l.push_back(Vector2(190, 255));
l.push_back(Vector2(135, 260));
l.push_back(Vector2(57, 200));
l.push_back(Vector2(50, 170));
l.push_back(Vector2(15, 155));
r = Geometry2D::intersect_polyline_with_polygon(l, p);
REQUIRE_MESSAGE(r.size() == 2, "There should be 2 resulting intersection lines.");
REQUIRE_MESSAGE(r[0].size() == 2, "The resulting intersection line should have 2 vertices.");
CHECK(r[0][0].is_equal_approx(Vector2(129.804565, 144.641693)));
CHECK(r[0][1].is_equal_approx(Vector2(171.527084, 221.132996)));
REQUIRE_MESSAGE(r[1].size() == 4, "The resulting intersection line should have 4 vertices.");
CHECK(r[1][0].is_equal_approx(Vector2(83.15609, 220.120087)));
CHECK(r[1][1].is_equal_approx(Vector2(57, 200)));
CHECK(r[1][2].is_equal_approx(Vector2(50, 170)));
CHECK(r[1][3].is_equal_approx(Vector2(34.980492, 163.563065)));
}
}
TEST_CASE("[Geometry2D] Clip polyline with polygon") {
Vector<Vector2> l;
Vector<Vector2> p;
Vector<Vector<Point2>> r;
l.push_back(Vector2(70, 140));
l.push_back(Vector2(160, 320));
p.push_back(Vector2(225, 180));
p.push_back(Vector2(160, 230));
p.push_back(Vector2(20, 212));
p.push_back(Vector2(50, 115));
SUBCASE("[Geometry2D] Both line and polygon are empty") {
r = Geometry2D::clip_polyline_with_polygon(Vector<Vector2>(), Vector<Vector2>());
CHECK_MESSAGE(r.is_empty(), "Both line and polygon are empty. The clipped line should also be empty.");
}
SUBCASE("[Geometry2D] Polygon is empty and line is non-empty") {
r = Geometry2D::clip_polyline_with_polygon(l, Vector<Vector2>());
REQUIRE_MESSAGE(r.size() == 1, "There should be 1 resulting clipped line.");
REQUIRE_MESSAGE(r[0].size() == 2, "The resulting clipped line should have 2 vertices.");
CHECK(r[0][0].is_equal_approx(l[0]));
CHECK(r[0][1].is_equal_approx(l[1]));
}
SUBCASE("[Geometry2D] Basic clip with 1 resulting clipped line") {
r = Geometry2D::clip_polyline_with_polygon(l, p);
REQUIRE_MESSAGE(r.size() == 1, "There should be 1 resulting clipped line.");
REQUIRE_MESSAGE(r[0].size() == 2, "The resulting clipped line should have 2 vertices.");
CHECK(r[0][0].is_equal_approx(Vector2(111.908401, 223.816803)));
CHECK(r[0][1].is_equal_approx(Vector2(160, 320)));
}
SUBCASE("[Geometry2D] Complex clip with 2 resulting clipped lines") {
l.clear();
l.push_back(Vector2(55, 70));
l.push_back(Vector2(50, 190));
l.push_back(Vector2(120, 165));
l.push_back(Vector2(122, 250));
l.push_back(Vector2(160, 320));
r = Geometry2D::clip_polyline_with_polygon(l, p);
REQUIRE_MESSAGE(r.size() == 2, "There should be 2 resulting clipped lines.");
REQUIRE_MESSAGE(r[0].size() == 3, "The resulting clipped line should have 3 vertices.");
CHECK(r[0][0].is_equal_approx(Vector2(160, 320)));
CHECK(r[0][1].is_equal_approx(Vector2(122, 250)));
CHECK(r[0][2].is_equal_approx(Vector2(121.412682, 225.038757)));
REQUIRE_MESSAGE(r[1].size() == 2, "The resulting clipped line should have 2 vertices.");
CHECK(r[1][0].is_equal_approx(Vector2(53.07737, 116.143021)));
CHECK(r[1][1].is_equal_approx(Vector2(55, 70)));
}
}
} // namespace TestGeometry2D
#endif // TEST_GEOMETRY_2D_H
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