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

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Here is the source code for com.badlogic.gdx.tests.box2d.OneSidedPlatform.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.
 ******************************************************************************/
/*
 * Copyright 2010 Mario Zechner (contact@badlogicgames.com), Nathan Sweet (admin@esotericsoftware.com)
 * 
 * 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.CircleShape;
import com.badlogic.gdx.physics.box2d.ContactFilter;
import com.badlogic.gdx.physics.box2d.EdgeShape;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.PolygonShape;
import com.badlogic.gdx.physics.box2d.World;

public class OneSidedPlatform extends Box2DTest {
    enum State {
        Unknown, Above, Below
    }

    Fixture m_platform;
    Fixture m_character;
    float m_bottom;
    float m_top;
    float m_radius;
    State m_state;

    @Override
    protected void createWorld(World world) {
        {
            BodyDef bd = new BodyDef();
            Body ground = world.createBody(bd);

            EdgeShape shape = new EdgeShape();
            shape.set(new Vector2(-20.0f, 0), new Vector2(20.0f, 0f));
            ground.createFixture(shape, 0);
            shape.dispose();
        }

        {
            BodyDef bd = new BodyDef();
            bd.position.set(0, 10);
            Body body = world.createBody(bd);

            PolygonShape shape = new PolygonShape();
            shape.setAsBox(3, 0.5f);
            m_platform = body.createFixture(shape, 0);
            m_bottom = 10.0f - 0.5f;
            m_top = 10.0f + 0.5f;
        }

        {
            BodyDef bd = new BodyDef();
            bd.type = BodyType.DynamicBody;
            bd.position.set(0, 12);
            Body body = world.createBody(bd);

            m_radius = 0.5f;
            CircleShape shape = new CircleShape();
            shape.setRadius(m_radius);
            m_character = body.createFixture(shape, 20.0f);
            shape.dispose();

            m_state = State.Unknown;
        }

        world.setContactFilter(new ContactFilter() {

            @Override
            public boolean shouldCollide(Fixture fixtureA, Fixture fixtureB) {
                if ((fixtureA == m_platform && fixtureB == m_character)
                        || (fixtureA == m_platform && fixtureB == m_character)) {
                    Vector2 position = m_character.getBody().getPosition();
                    if (position.y < m_top + m_radius - 3.0f * 0.005f)
                        return false;
                    else
                        return true;
                } else
                    return true;
            }

        });
    }

}