org.jtrfp.trcl.beh.FacingObject.java Source code

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Here is the source code for org.jtrfp.trcl.beh.FacingObject.java

Source

/*******************************************************************************
 * This file is part of TERMINAL RECALL
 * Copyright (c) 2012-2014 Chuck Ritola
 * Part of the jTRFP.org project
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     chuck - initial API and implementation
 ******************************************************************************/

package org.jtrfp.trcl.beh;

import org.apache.commons.math3.geometry.euclidean.threed.Vector3D;
import org.jtrfp.trcl.math.Vect3D;
import org.jtrfp.trcl.obj.WorldObject;

public class FacingObject extends Behavior {
    private WorldObject target;
    private final double[] work = new double[3];
    private final double[] perp = new double[3];
    private final double[] UP = new double[] { 0, 1, 0 };

    @Override
    public void _tick(long tickTimeMillis) {
        if (target != null) {
            final WorldObject parent = getParent();
            final double[] tPos = target.getPosition();
            final double[] pPos = parent.getPosition();
            Vect3D.subtract(tPos, pPos, work);
            parent.setHeading(new Vector3D(Vect3D.normalize(work, work)));
            Vect3D.cross(work, UP, perp);
            Vect3D.cross(perp, work, perp);
            parent.setTop(Vector3D.PLUS_J);
        } //end if(!null)
    }//end _tick(...)

    /**
     * @return the target
     */
    public WorldObject getTarget() {
        return target;
    }

    /**
     * @param target the target to set
     */
    public FacingObject setTarget(WorldObject target) {
        this.target = target;
        return this;
    }
}//end FacingObject