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Diffstat (limited to 'tests/parallelogram-test.cpp')
| -rw-r--r-- | tests/parallelogram-test.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/tests/parallelogram-test.cpp b/tests/parallelogram-test.cpp new file mode 100644 index 0000000..70ccea1 --- /dev/null +++ b/tests/parallelogram-test.cpp @@ -0,0 +1,161 @@ +/** @file + * @brief Unit tests for Parallelogram + * + * Includes all tests from RotatedRect to demonstrate that it is a generalized + * version of the rotated rectangle. + */ +/* + * Authors: + * Thomas Holder + * Sergei Izmailov + * + * SPDX-License-Identifier: LGPL-2.1 or MPL-1.1 + */ + +#include <2geom/coord.h> +#include <2geom/parallelogram.h> +#include <2geom/transforms.h> + +#include <gtest/gtest.h> + +using namespace Geom; + +// Analogous to RotatedRect::from_rect_rotate +static Parallelogram parallelogram_from_rect_rotate(Rect const &rect, Rotate const &rotate, Point const &point) +{ + Affine affine = Translate(-point) * rotate * Translate(point); + return Parallelogram(rect) * affine; +} +static Parallelogram parallelogram_from_rect_rotate(Rect const &rect, Rotate const &rotate) +{ + return parallelogram_from_rect_rotate(rect, rotate, rect.midpoint()); +} + +TEST(ParallelogramTest, midpoint) +{ + Rect r(-0.5, -0.5, 5.5, 5.5); + auto center = Point(2.5, 2.5); + + EXPECT_EQ(r.midpoint(), center); + for (double angle : { 0, 1, 25, 45, 90, 135 }) { + auto rotated_rect = parallelogram_from_rect_rotate(r, Rotate::from_degrees(angle), Point(0, 0)); + auto rotated_center = center * Rotate(angle / 180.0 * M_PI); + EXPECT_TRUE(Geom::are_near(rotated_rect.midpoint(), rotated_center, 1e-6)) << "Angle = " << angle << " deg"; + } +} + +TEST(ParallelogramTest, containsPoint1) +{ + Rect r(0, 0, 1, 1); + auto rotated_rect = r; + EXPECT_TRUE(rotated_rect.contains(Point(0, 0))); + EXPECT_TRUE(rotated_rect.contains(Point(1, 1))); + EXPECT_TRUE(rotated_rect.contains(Point(0.5, 0.5))); + EXPECT_FALSE(rotated_rect.contains(Point(1.1, 0.5))); + EXPECT_FALSE(rotated_rect.contains(Point(0.5, 1.1))); +} + +TEST(ParallelogramTest, containsPoint2) +{ + Rect r(0, 0, 1, 1); + auto rotated_rect = parallelogram_from_rect_rotate(r, Rotate::from_degrees(45), Point(0, 0)); + EXPECT_TRUE(rotated_rect.contains(Point(0, 0))); + EXPECT_TRUE(rotated_rect.contains(Point(0, 1.2))); + EXPECT_TRUE(rotated_rect.contains(Point(0.5, 0.9))); + EXPECT_FALSE(rotated_rect.contains(Point(1, 1))); + EXPECT_FALSE(rotated_rect.contains(Point(0.1, 0))); +} + +TEST(ParallelogramTest, intersects_aligned) +{ + Rect r(0, 0, 1, 1); + auto rotated_rect = r; + // point within rect + EXPECT_TRUE(rotated_rect.intersects(Rect(-1, -1, 2, 2))); + EXPECT_TRUE(rotated_rect.intersects(Rect(0.1, 0.1, 0.2, 0.2))); + EXPECT_TRUE(rotated_rect.intersects(Rect(-0.1, -0.1, 0.1, 0.1))); + EXPECT_FALSE(rotated_rect.intersects(Rect(-0.2, -0.2, -0.1, -0.1))); + EXPECT_FALSE(rotated_rect.intersects(Rect(1.1, 1.1, 1.2, 1.2))); + // edge intersection + EXPECT_TRUE(rotated_rect.intersects(Rect(0.5, -0.1, 0.6, 1.2))); + EXPECT_TRUE(rotated_rect.intersects(Rect(-0.1, 0.5, 1.2, 0.6))); +} + +TEST(ParallelogramTest, bounds) +{ + auto r = Rect::from_xywh(1.260, 0.547, 8.523, 11.932); + auto rrect = parallelogram_from_rect_rotate(r, Rotate::from_degrees(15.59)); + auto bbox = rrect.bounds(); + auto expected_bbox = Rect::from_xywh(-0.186, -0.378, 11.415, 13.783); + for (int i = 0; i < 4; i++) { + EXPECT_TRUE(Geom::are_near(bbox.corner(i), expected_bbox.corner(i), 1e-3)); + } +} + +TEST(ParallelogramTest, isSheared) +{ + Parallelogram p(Rect(2, 4, 7, 8)); + EXPECT_FALSE(p.isSheared()); + p *= Rotate(M_PI / 4.0); // 45° + EXPECT_FALSE(p.isSheared()); + p *= HShear(2); + EXPECT_TRUE(p.isSheared()); +} + +TEST(ParallelogramTest, area) +{ + Rect r(2, 4, 7, 8); + Parallelogram p(r); + EXPECT_DOUBLE_EQ(p.area(), r.area()); + p *= Rotate(M_PI / 4.0); // 45° + EXPECT_DOUBLE_EQ(p.area(), r.area()); + p *= HShear(2); + EXPECT_DOUBLE_EQ(p.area(), r.area()); + p *= Scale(2); + EXPECT_DOUBLE_EQ(p.area(), r.area() * 4); +} + +class ParallelogramTest + : public testing::TestWithParam<std::tuple<Rect /*rect*/, double /*degrees*/, bool /*intersects*/>> { + + void SetUp() override { target = Rect::from_xywh(0, 0, 11, 13); } + + public: + Rect target; +}; + +TEST_P(ParallelogramTest, intersects) +{ + Rect rect; + double degrees; + bool intersects; + std::tie(rect, degrees, intersects) = GetParam(); + EXPECT_EQ(parallelogram_from_rect_rotate(rect, Rotate::from_degrees(degrees)).intersects(target), intersects) + << "ERROR: rect {" << rect << "} rotated by {" << degrees << "} degrees " << (!intersects ? "" : "NOT ") + << "intersects with {" << target << "} but MUST " << (intersects ? "" : "NOT"); +} + +// clang-format off +INSTANTIATE_TEST_CASE_P(intesect_non_aligned, ParallelogramTest, + testing::Values( + std::make_tuple(Rect::from_xywh(10.456, -4.479, 7, 5), 0, true), + std::make_tuple(Rect::from_xywh(10.456, -4.479, 7, 5), 15, false), + std::make_tuple(Rect::from_xywh(9.929, 12.313, 7, 5), 93.2, false), + std::make_tuple(Rect::from_xywh(9.929, 12.313, 7, 5), 91.37, true), + std::make_tuple(Rect::from_xywh(-1, 4, 13, 3), 0, true), + std::make_tuple(Rect::from_xywh(4, -2, 3, 16), 0, true), + std::make_tuple(Rect::from_xywh(-5.113, -3.283, 5.000, 7.000), 11.81, false), + std::make_tuple(Rect::from_xywh(-5.113, -3.283, 5.000, 7.000), 13.35, true), + std::make_tuple(Rect::from_xywh(1.260, 0.547, 8.523, 11.932), 15.59, true), + std::make_tuple(Rect::from_xywh(5.328, 0.404, 11, 2), 28.16, true), + std::make_tuple(Rect::from_xywh(4.853, 10.691, 11, 2), -30.4, true), + std::make_tuple(Rect::from_xywh(-4.429, 10.752, 11, 2), 29.7, true), + std::make_tuple(Rect::from_xywh(-4.538, 0.314, 11, 2), -34.19, true), + std::make_tuple(Rect::from_xywh(8.398, -3.790, 2, 11), -34, true), + std::make_tuple(Rect::from_xywh(8.614, 6.163, 2, 11), 30.38, true), + std::make_tuple(Rect::from_xywh(0.492, 6.904, 2, 11), -37.29, true), + std::make_tuple(Rect::from_xywh(0.202, -3.148, 2, 11), 31.12, true))); + +// clang-format on + +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 : |