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* Copyright (c) 2013, Daniel Murphy
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package org.jbox2d.testbed.tests;
import org.jbox2d.collision.Manifold;
import org.jbox2d.collision.shapes.EdgeShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
import org.jbox2d.dynamics.BodyDef;
import org.jbox2d.dynamics.BodyType;
import org.jbox2d.dynamics.Fixture;
import org.jbox2d.dynamics.FixtureDef;
import org.jbox2d.dynamics.contacts.Contact;
import org.jbox2d.testbed.framework.TestbedTest;
public class ConveyorBelt extends TestbedTest {
private static long platformTag = 98752L;
private Fixture m_platform;
@Override
public Long getTag(Fixture argFixture) {
if (argFixture == m_platform) {
return platformTag;
}
return super.getTag(argFixture);
}
@Override
public void processFixture(Fixture argFixture, Long argTag) {
if(argTag == platformTag) {
m_platform = argFixture;
return;
}
super.processFixture(argFixture, argTag);
}
@Override
public boolean isSaveLoadEnabled() {
return true;
}
@Override
public void initTest(boolean deserialized) {
if(deserialized) {
return;
}
// Ground
{
EdgeShape shape = new EdgeShape();
shape.set(new Vec2(-20.0f, 0.0f), new Vec2(20.0f, 0.0f));
getGroundBody().createFixture(shape, 0.0f);
}
// Platform
{
BodyDef bd = new BodyDef();
bd.position.set(-5.0f, 5.0f);
Body body = getWorld().createBody(bd);
PolygonShape shape = new PolygonShape();
shape.setAsBox(10.0f, 0.5f);
FixtureDef fd = new FixtureDef();
fd.shape = shape;
fd.friction = 0.8f;
m_platform = body.createFixture(fd);
}
// Boxes
for (int i = 0; i < 5; ++i) {
BodyDef bd = new BodyDef();
bd.type = BodyType.DYNAMIC;
bd.position.set(-10.0f + 2.0f * i, 7.0f);
Body body = m_world.createBody(bd);
PolygonShape shape = new PolygonShape();
shape.setAsBox(0.5f, 0.5f);
body.createFixture(shape, 20.0f);
}
}
@Override
public void preSolve(Contact contact, Manifold oldManifold) {
super.preSolve(contact, oldManifold);
Fixture fixtureA = contact.getFixtureA();
Fixture fixtureB = contact.getFixtureB();
if (fixtureA == m_platform || fixtureB == m_platform) {
contact.setTangentSpeed(5.0f);
}
}
@Override
public String getTestName() {
return "Conveyor Belt";
}
}