es.eucm.ead.engine.collision.CircleWrapper.java Source code

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Here is the source code for es.eucm.ead.engine.collision.CircleWrapper.java

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/**
 * eAdventure is a research project of the
 *    e-UCM research group.
 *
 *    Copyright 2005-2014 e-UCM research group.
 *
 *    You can access a list of all the contributors to eAdventure at:
 *          http://e-adventure.e-ucm.es/contributors
 *
 *    e-UCM is a research group of the Department of Software Engineering
 *          and Artificial Intelligence at the Complutense University of Madrid
 *          (School of Computer Science).
 *
 *          CL Profesor Jose Garcia Santesmases 9,
 *          28040 Madrid (Madrid), Spain.
 *
 *          For more info please visit:  <http://e-adventure.e-ucm.es> or
 *          <http://www.e-ucm.es>
 *
 * ****************************************************************************
 *
 *  This file is part of eAdventure
 *
 *      eAdventure is free software: you can redistribute it and/or modify
 *      it under the terms of the GNU Lesser General Public License as published by
 *      the Free Software Foundation, either version 3 of the License, or
 *      (at your option) any later version.
 *
 *      eAdventure is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU Lesser General Public License for more details.
 *
 *      You should have received a copy of the GNU Lesser General Public License
 *      along with eAdventure.  If not, see <http://www.gnu.org/licenses/>.
 */
package es.eucm.ead.engine.collision;

import com.badlogic.gdx.math.Circle;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Pools;

/**
 * Created by Javier Torrente on 5/07/14.
 */
public class CircleWrapper extends AreaWrapper {
    Circle circle;

    public void set(Circle circle) {
        this.circle = circle;
    }

    @Override
    protected void getCenter(Vector2 center) {
        center.set(circle.x, circle.y);
    }

    @Override
    protected boolean intersectToSegment(Vector2 start, Vector2 end, Vector2 intersection) {
        Vector2 v = Pools.obtain(Vector2.class);
        if (circle.contains(start) && !circle.contains(end)) {
            v.set(end);
            v.sub(start);
        } else if (!circle.contains(start) && circle.contains(end)) {
            v.set(start);
            v.sub(end);
        } else {
            return false;
        }

        v.scl(circle.radius / v.len());

        getCenter(intersection);
        intersection.add(v);
        Pools.free(v);
        return true;
    }

    @Override
    public void reset() {
        Pools.free(circle);
        circle = null;
    }
}