godot/tests/core/math/test_transform_3d.h

/*************************************************************************/
/*  test_transform_3d.h                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* 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_TRANSFORM_3D_H
#define TEST_TRANSFORM_3D_H

#include "core/math/transform_3d.h"

#include "tests/test_macros.h"

namespace TestTransform3D {

Transform3D create_dummy_transform() {
	return Transform3D(Basis(Vector3(1, 2, 3), Vector3(4, 5, 6), Vector3(7, 8, 9)), Vector3(10, 11, 12));
}

Transform3D identity() {
	return Transform3D();
}

TEST_CASE("[Transform3D] translation") {
	Vector3 offset = Vector3(1, 2, 3);

	// Both versions should give the same result applied to identity.
	CHECK(identity().translated(offset) == identity().translated_local(offset));

	// Check both versions against left and right multiplications.
	Transform3D orig = create_dummy_transform();
	Transform3D T = identity().translated(offset);
	CHECK(orig.translated(offset) == T * orig);
	CHECK(orig.translated_local(offset) == orig * T);
}

TEST_CASE("[Transform3D] scaling") {
	Vector3 scaling = Vector3(1, 2, 3);

	// Both versions should give the same result applied to identity.
	CHECK(identity().scaled(scaling) == identity().scaled_local(scaling));

	// Check both versions against left and right multiplications.
	Transform3D orig = create_dummy_transform();
	Transform3D S = identity().scaled(scaling);
	CHECK(orig.scaled(scaling) == S * orig);
	CHECK(orig.scaled_local(scaling) == orig * S);
}

TEST_CASE("[Transform3D] rotation") {
	Vector3 axis = Vector3(1, 2, 3).normalized();
	real_t phi = 1.0;

	// Both versions should give the same result applied to identity.
	CHECK(identity().rotated(axis, phi) == identity().rotated_local(axis, phi));

	// Check both versions against left and right multiplications.
	Transform3D orig = create_dummy_transform();
	Transform3D R = identity().rotated(axis, phi);
	CHECK(orig.rotated(axis, phi) == R * orig);
	CHECK(orig.rotated_local(axis, phi) == orig * R);
}
} // namespace TestTransform3D

#endif // TEST_TRANSFORM_3D_H