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// 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);
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