org.destinationsol.game.SolContactListener.java Source code

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Here is the source code for org.destinationsol.game.SolContactListener.java

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/*
 * Copyright 2015 MovingBlocks
 *
 * 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 org.destinationsol.game;

import com.badlogic.gdx.math.Vector2;
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.Manifold;
import org.destinationsol.common.SolMath;
import org.destinationsol.game.projectile.Projectile;

public class SolContactListener implements ContactListener {
    private final SolGame myGame;

    public SolContactListener(SolGame game) {
        myGame = game;
    }

    @Override
    public void beginContact(Contact contact) {
        SolObject oA = (SolObject) contact.getFixtureA().getBody().getUserData();
        SolObject oB = (SolObject) contact.getFixtureB().getBody().getUserData();

        boolean aIsProj = oA instanceof Projectile;
        if (!aIsProj && !(oB instanceof Projectile))
            return;

        Projectile proj = (Projectile) (aIsProj ? oA : oB);
        SolObject o = aIsProj ? oB : oA;
        proj.setObstacle(o, myGame);
    }

    @Override
    public void endContact(Contact contact) {
    }

    @Override
    public void preSolve(Contact contact, Manifold oldManifold) {
    }

    @Override
    public void postSolve(Contact contact, ContactImpulse impulse) {
        SolObject soa = (SolObject) contact.getFixtureA().getBody().getUserData();
        SolObject sob = (SolObject) contact.getFixtureB().getBody().getUserData();
        if (soa instanceof Projectile && ((Projectile) soa).getConfig().density <= 0)
            return;
        if (sob instanceof Projectile && ((Projectile) sob).getConfig().density <= 0)
            return;

        float absImpulse = calcAbsImpulse(impulse);
        Vector2 collPos = contact.getWorldManifold().getPoints()[0];
        soa.handleContact(sob, impulse, true, absImpulse, myGame, collPos);
        sob.handleContact(soa, impulse, false, absImpulse, myGame, collPos);
        myGame.getSpecialSounds().playColl(myGame, absImpulse, soa, collPos);
        myGame.getSpecialSounds().playColl(myGame, absImpulse, sob, collPos);
    }

    private float calcAbsImpulse(ContactImpulse impulse) {
        float absImpulse = 0;
        int pointCount = impulse.getCount();
        float[] normImpulses = impulse.getNormalImpulses();
        for (int i = 0; i < pointCount; i++) {
            float normImpulse = normImpulses[i];
            normImpulse = SolMath.abs(normImpulse);
            if (absImpulse < normImpulse)
                absImpulse = normImpulse;
        }
        return absImpulse;
    }
}