Add unit tests for Curve2D
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Henrique Coura
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2 changed files with 229 additions and 0 deletions
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tests/scene/test_curve_2d.h
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tests/scene/test_curve_2d.h
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/**************************************************************************/
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/* test_curve_2d.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef TEST_CURVE_2D_H
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#define TEST_CURVE_2D_H
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#include "core/math/math_funcs.h"
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#include "scene/resources/curve.h"
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#include "tests/test_macros.h"
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namespace TestCurve2D {
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void add_sample_curve_points(Ref<Curve2D> &curve) {
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Vector2 p0 = Vector2(0, 0);
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Vector2 p1 = Vector2(50, 0);
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Vector2 p2 = Vector2(50, 50);
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Vector2 p3 = Vector2(0, 50);
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Vector2 control0 = p1 - p0;
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Vector2 control1 = p3 - p2;
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curve->add_point(p0, Vector2(), control0);
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curve->add_point(p3, control1, Vector2());
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}
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TEST_CASE("[Curve2D] Default curve is empty") {
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const Ref<Curve2D> curve = memnew(Curve2D);
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CHECK(curve->get_point_count() == 0);
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}
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TEST_CASE("[Curve2D] Point management") {
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Ref<Curve2D> curve = memnew(Curve2D);
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SUBCASE("Functions for adding/removing points should behave as expected") {
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curve->set_point_count(2);
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CHECK(curve->get_point_count() == 2);
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curve->remove_point(0);
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CHECK(curve->get_point_count() == 1);
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curve->add_point(Vector2());
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CHECK(curve->get_point_count() == 2);
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curve->clear_points();
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CHECK(curve->get_point_count() == 0);
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}
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SUBCASE("Functions for changing single point properties should behave as expected") {
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Vector2 new_in = Vector2(1, 1);
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Vector2 new_out = Vector2(1, 1);
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Vector2 new_pos = Vector2(1, 1);
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curve->add_point(Vector2());
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CHECK(curve->get_point_in(0) != new_in);
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curve->set_point_in(0, new_in);
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CHECK(curve->get_point_in(0) == new_in);
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CHECK(curve->get_point_out(0) != new_out);
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curve->set_point_out(0, new_out);
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CHECK(curve->get_point_out(0) == new_out);
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CHECK(curve->get_point_position(0) != new_pos);
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curve->set_point_position(0, new_pos);
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CHECK(curve->get_point_position(0) == new_pos);
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}
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}
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TEST_CASE("[Curve2D] Baked") {
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Ref<Curve2D> curve = memnew(Curve2D);
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SUBCASE("Single Point") {
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curve->add_point(Vector2());
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CHECK(curve->get_baked_length() == 0);
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CHECK(curve->get_baked_points().size() == 1);
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}
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SUBCASE("Straight line") {
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curve->add_point(Vector2());
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curve->add_point(Vector2(0, 50));
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CHECK(Math::is_equal_approx(curve->get_baked_length(), 50));
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CHECK(curve->get_baked_points().size() == 15);
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}
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SUBCASE("Beziér Curve") {
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add_sample_curve_points(curve);
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real_t len = curve->get_baked_length();
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real_t n_points = curve->get_baked_points().size();
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// Curve length should be bigger than a straight between points
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CHECK(len > 50);
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SUBCASE("Increase bake interval") {
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curve->set_bake_interval(10.0);
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// Lower resolution should imply less points and smaller length
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CHECK(curve->get_baked_length() < len);
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CHECK(curve->get_baked_points().size() < n_points);
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}
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}
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}
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TEST_CASE("[Curve2D] Sampling") {
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// Sampling over a simple straight line to make assertions simpler
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Ref<Curve2D> curve = memnew(Curve2D);
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curve->add_point(Vector2());
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curve->add_point(Vector2(0, 50));
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SUBCASE("sample") {
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CHECK(curve->sample(0, 0) == Vector2(0, 0));
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CHECK(curve->sample(0, 0.5) == Vector2(0, 25));
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CHECK(curve->sample(0, 1) == Vector2(0, 50));
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}
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SUBCASE("samplef") {
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CHECK(curve->samplef(0) == Vector2(0, 0));
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CHECK(curve->samplef(0.5) == Vector2(0, 25));
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CHECK(curve->samplef(1) == Vector2(0, 50));
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}
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SUBCASE("sample_baked") {
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CHECK(curve->sample_baked(curve->get_closest_offset(Vector2(0, 0))) == Vector2(0, 0));
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CHECK(curve->sample_baked(curve->get_closest_offset(Vector2(0, 25))) == Vector2(0, 25));
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CHECK(curve->sample_baked(curve->get_closest_offset(Vector2(0, 50))) == Vector2(0, 50));
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}
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SUBCASE("sample_baked_with_rotation") {
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const real_t pi = 3.14159;
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Transform2D t = curve->sample_baked_with_rotation(curve->get_closest_offset(Vector2(0, 0)));
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CHECK(t.get_origin() == Vector2(0, 0));
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CHECK(Math::is_equal_approx(t.get_rotation(), pi));
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t = curve->sample_baked_with_rotation(curve->get_closest_offset(Vector2(0, 25)));
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CHECK(t.get_origin() == Vector2(0, 25));
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CHECK(Math::is_equal_approx(t.get_rotation(), pi));
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t = curve->sample_baked_with_rotation(curve->get_closest_offset(Vector2(0, 50)));
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CHECK(t.get_origin() == Vector2(0, 50));
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CHECK(Math::is_equal_approx(t.get_rotation(), pi));
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}
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SUBCASE("get_closest_point") {
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CHECK(curve->get_closest_point(Vector2(0, 0)) == Vector2(0, 0));
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CHECK(curve->get_closest_point(Vector2(0, 25)) == Vector2(0, 25));
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CHECK(curve->get_closest_point(Vector2(50, 25)) == Vector2(0, 25));
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CHECK(curve->get_closest_point(Vector2(0, 50)) == Vector2(0, 50));
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CHECK(curve->get_closest_point(Vector2(50, 50)) == Vector2(0, 50));
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CHECK(curve->get_closest_point(Vector2(0, 100)) == Vector2(0, 50));
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}
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}
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TEST_CASE("[Curve2D] Tessellation") {
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Ref<Curve2D> curve = memnew(Curve2D);
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add_sample_curve_points(curve);
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const int default_size = curve->tessellate().size();
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SUBCASE("Increase to max stages should increase num of points") {
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CHECK(curve->tessellate(6).size() > default_size);
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}
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SUBCASE("Decrease to max stages should decrease num of points") {
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CHECK(curve->tessellate(4).size() < default_size);
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}
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SUBCASE("Increase to tolerance should decrease num of points") {
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CHECK(curve->tessellate(5, 5).size() < default_size);
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}
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SUBCASE("Decrease to tolerance should increase num of points") {
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CHECK(curve->tessellate(5, 3).size() > default_size);
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}
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SUBCASE("Adding a straight segment should only add the last point to tessellate return array") {
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curve->add_point(Vector2(0, 100));
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PackedVector2Array tes = curve->tessellate();
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CHECK(tes.size() == default_size + 1);
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CHECK(tes[tes.size() - 1] == Vector2(0, 100));
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CHECK(tes[tes.size() - 2] == Vector2(0, 50));
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}
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}
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TEST_CASE("[Curve2D] Even length tessellation") {
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Ref<Curve2D> curve = memnew(Curve2D);
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add_sample_curve_points(curve);
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const int default_size = curve->tessellate_even_length().size();
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// Default tessellate_even_length tolerance_length is 20.0, by adding a 100 units
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// straight, we expect the total size to be increased by more than 5,
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// that is, the algo will pick a length < 20.0 and will divide the straight as
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// well as the curve as opposed to tessellate() which only adds the final point
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curve->add_point(Vector2(0, 150));
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CHECK(curve->tessellate_even_length().size() > default_size + 5);
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}
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} // namespace TestCurve2D
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#endif // TEST_CURVE_2D_H
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@ -91,6 +91,7 @@
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#include "tests/scene/test_bit_map.h"
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#include "tests/scene/test_code_edit.h"
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#include "tests/scene/test_curve.h"
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#include "tests/scene/test_curve_2d.h"
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#include "tests/scene/test_gradient.h"
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#include "tests/scene/test_node.h"
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#include "tests/scene/test_path_2d.h"
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