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/**************************************************************************/
/* test_gradient.h */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* 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. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#ifndef TEST_GRADIENT_H
#define TEST_GRADIENT_H
#include "scene/resources/gradient.h"
#include "thirdparty/doctest/doctest.h"
namespace TestGradient {
TEST_CASE("[Gradient] Default gradient") {
// Black-white gradient.
Ref<Gradient> gradient = memnew(Gradient);
CHECK_MESSAGE(
gradient->get_point_count() == 2,
"Default gradient should contain the expected number of points.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.0).is_equal_approx(Color(0, 0, 0)),
"Default gradient should return the expected interpolated value at offset 0.0.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.4).is_equal_approx(Color(0.4, 0.4, 0.4)),
"Default gradient should return the expected interpolated value at offset 0.4.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.8).is_equal_approx(Color(0.8, 0.8, 0.8)),
"Default gradient should return the expected interpolated value at offset 0.8.");
CHECK_MESSAGE(
gradient->get_color_at_offset(1.0).is_equal_approx(Color(1, 1, 1)),
"Default gradient should return the expected interpolated value at offset 1.0.");
// Out of bounds checks.
CHECK_MESSAGE(
gradient->get_color_at_offset(-1.0).is_equal_approx(Color(0, 0, 0)),
"Default gradient should return the expected interpolated value at offset -1.0.");
CHECK_MESSAGE(
gradient->get_color_at_offset(1234.0).is_equal_approx(Color(1, 1, 1)),
"Default gradient should return the expected interpolated value at offset 1234.0.");
}
TEST_CASE("[Gradient] Custom gradient (points specified in order)") {
// Red-yellow-green gradient (with overbright green).
Ref<Gradient> gradient = memnew(Gradient);
Vector<Gradient::Point> points;
points.push_back({ 0.0, Color(1, 0, 0) });
points.push_back({ 0.5, Color(1, 1, 0) });
points.push_back({ 1.0, Color(0, 2, 0) });
gradient->set_points(points);
CHECK_MESSAGE(
gradient->get_point_count() == 3,
"Custom gradient should contain the expected number of points.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.0).is_equal_approx(Color(1, 0, 0)),
"Custom gradient should return the expected interpolated value at offset 0.0.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.25).is_equal_approx(Color(1, 0.5, 0)),
"Custom gradient should return the expected interpolated value at offset 0.25.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.5).is_equal_approx(Color(1, 1, 0)),
"Custom gradient should return the expected interpolated value at offset 0.5.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.75).is_equal_approx(Color(0.5, 1.5, 0)),
"Custom gradient should return the expected interpolated value at offset 0.75.");
CHECK_MESSAGE(
gradient->get_color_at_offset(1.0).is_equal_approx(Color(0, 2, 0)),
"Custom gradient should return the expected interpolated value at offset 1.0.");
gradient->remove_point(1);
CHECK_MESSAGE(
gradient->get_point_count() == 2,
"Custom gradient should contain the expected number of points after removing one point.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.5).is_equal_approx(Color(0.5, 1, 0)),
"Custom gradient should return the expected interpolated value at offset 0.5 after removing point at index 1.");
}
TEST_CASE("[Gradient] Custom gradient (points specified out-of-order)") {
// HSL rainbow with points specified out of order.
// These should be sorted automatically when adding points.
Ref<Gradient> gradient = memnew(Gradient);
Vector<Gradient::Point> points;
points.push_back({ 0.2, Color(1, 0, 0) });
points.push_back({ 0.0, Color(1, 1, 0) });
points.push_back({ 0.8, Color(0, 1, 0) });
points.push_back({ 0.4, Color(0, 1, 1) });
points.push_back({ 1.0, Color(0, 0, 1) });
points.push_back({ 0.6, Color(1, 0, 1) });
gradient->set_points(points);
CHECK_MESSAGE(
gradient->get_point_count() == 6,
"Custom out-of-order gradient should contain the expected number of points.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.0).is_equal_approx(Color(1, 1, 0)),
"Custom out-of-order gradient should return the expected interpolated value at offset 0.0.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.3).is_equal_approx(Color(0.5, 0.5, 0.5)),
"Custom out-of-order gradient should return the expected interpolated value at offset 0.3.");
CHECK_MESSAGE(
gradient->get_color_at_offset(0.6).is_equal_approx(Color(1, 0, 1)),
"Custom out-of-order gradient should return the expected interpolated value at offset 0.6.");
CHECK_MESSAGE(
gradient->get_color_at_offset(1.0).is_equal_approx(Color(0, 0, 1)),
"Custom out-of-order gradient should return the expected interpolated value at offset 1.0.");
gradient->remove_point(0);
CHECK_MESSAGE(
gradient->get_point_count() == 5,
"Custom out-of-order gradient should contain the expected number of points after removing one point.");
// The color will be clamped to the nearest point (which is at offset 0.2).
CHECK_MESSAGE(
gradient->get_color_at_offset(0.1).is_equal_approx(Color(1, 0, 0)),
"Custom out-of-order gradient should return the expected interpolated value at offset 0.1 after removing point at index 0.");
}
} // namespace TestGradient
#endif // TEST_GRADIENT_H
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