com.badlogic.gdx.tests.box2d.ConveyorBelt.java Source code

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Here is the source code for com.badlogic.gdx.tests.box2d.ConveyorBelt.java

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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.tests.box2d;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.BodyDef.BodyType;
import com.badlogic.gdx.physics.box2d.Contact;
import com.badlogic.gdx.physics.box2d.ContactImpulse;
import com.badlogic.gdx.physics.box2d.ContactListener;
import com.badlogic.gdx.physics.box2d.EdgeShape;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.Manifold;
import com.badlogic.gdx.physics.box2d.PolygonShape;
import com.badlogic.gdx.physics.box2d.World;

public class ConveyorBelt extends Box2DTest implements ContactListener {
    Fixture m_platform;

    @Override
    protected void createWorld(World world) {
        world.setContactListener(this);

        // Ground
        {
            BodyDef bodyDef = new BodyDef();
            groundBody = world.createBody(bodyDef);

            EdgeShape shape = new EdgeShape();
            shape.set(new Vector2(-20.0f, 0.0f), new Vector2(20.0f, 0.0f));
            groundBody.createFixture(shape, 0.0f);
        }

        // Platform
        {
            BodyDef bd = new BodyDef();
            bd.position.set(-5.0f, 5.0f);
            Body body = world.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.DynamicBody;
            bd.position.set(-10.0f + 2.0f * i, 7.0f);
            Body body = world.createBody(bd);

            PolygonShape shape = new PolygonShape();
            shape.setAsBox(0.5f, 0.5f);
            body.createFixture(shape, 20.0f);
        }
    }

    public void preSolve(Contact contact, Manifold oldManifold) {
        Fixture fixtureA = contact.getFixtureA();
        Fixture fixtureB = contact.getFixtureB();

        if (fixtureA == m_platform || fixtureB == m_platform) {
            contact.setTangentSpeed(5.0f);
        }
    }

    @Override
    public void beginContact(Contact contact) {

    }

    @Override
    public void endContact(Contact contact) {
    }

    @Override
    public void postSolve(Contact contact, ContactImpulse impulse) {
    }
}