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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"
class ConveyorBelt : public Test
{
public:
ConveyorBelt()
{
// Ground
{
b2BodyDef bd;
b2Body* ground = m_world->CreateBody(&bd);
b2EdgeShape shape;
shape.SetTwoSided(b2Vec2(-20.0f, 0.0f), b2Vec2(20.0f, 0.0f));
ground->CreateFixture(&shape, 0.0f);
}
// Platform
{
b2BodyDef bd;
bd.position.Set(-5.0f, 5.0f);
b2Body* body = m_world->CreateBody(&bd);
b2PolygonShape shape;
shape.SetAsBox(10.0f, 0.5f);
b2FixtureDef fd;
fd.shape = &shape;
fd.friction = 0.8f;
m_platform = body->CreateFixture(&fd);
}
// Boxes
for (int32 i = 0; i < 5; ++i)
{
b2BodyDef bd;
bd.type = b2_dynamicBody;
bd.position.Set(-10.0f + 2.0f * i, 7.0f);
b2Body* body = m_world->CreateBody(&bd);
b2PolygonShape shape;
shape.SetAsBox(0.5f, 0.5f);
body->CreateFixture(&shape, 20.0f);
}
}
void PreSolve(b2Contact* contact, const b2Manifold* oldManifold) override
{
Test::PreSolve(contact, oldManifold);
b2Fixture* fixtureA = contact->GetFixtureA();
b2Fixture* fixtureB = contact->GetFixtureB();
if (fixtureA == m_platform)
{
contact->SetTangentSpeed(5.0f);
}
if (fixtureB == m_platform)
{
contact->SetTangentSpeed(-5.0f);
}
}
void Step(Settings& settings) override
{
Test::Step(settings);
}
static Test* Create()
{
return new ConveyorBelt;
}
b2Fixture* m_platform;
};
static int testIndex = RegisterTest("Examples", "Conveyor Belt", ConveyorBelt::Create);
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