// MIT License

// Copyright (c) 2019 Erin Catto

// 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.

#include "test.h"

// Note: even with a restitution of 1.0, there is some energy change
// due to position correction.
class Restitution : public Test
{
public:

	Restitution()
	{
		const float threshold = 10.0f;

		{
			b2BodyDef bd;
			b2Body* ground = m_world->CreateBody(&bd);

			b2EdgeShape shape;
			shape.SetTwoSided(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
			
			b2FixtureDef fd;
			fd.shape = &shape;
			fd.restitutionThreshold = threshold;
			ground->CreateFixture(&fd);
		}

		{
			b2CircleShape shape;
			shape.m_radius = 1.0f;

			b2FixtureDef fd;
			fd.shape = &shape;
			fd.density = 1.0f;

			float restitution[7] = { 0.0f, 0.1f, 0.3f, 0.5f, 0.75f, 0.9f, 1.0f };

			for (int32 i = 0; i < 7; ++i)
			{
				b2BodyDef bd;
				bd.type = b2_dynamicBody;
				bd.position.Set(-10.0f + 3.0f * i, 20.0f);

				b2Body* body = m_world->CreateBody(&bd);

				fd.restitution = restitution[i];
				fd.restitutionThreshold = threshold;
				body->CreateFixture(&fd);
			}
		}
	}

	static Test* Create()
	{
		return new Restitution;
	}
};

static int testIndex = RegisterTest("Forces", "Restitution", Restitution::Create);