jtrace.object.transformation.Scale.java Source code

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Here is the source code for jtrace.object.transformation.Scale.java

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/*
 * Copyright (C) 2014 Tim Vaughan <tgvaughan@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package jtrace.object.transformation;

import org.apache.commons.math3.geometry.euclidean.threed.Vector3D;

/**
 * Scale coordinate transformation.
 *
 * @author Tim Vaughan <tgvaughan@gmail.com>
 */
public class Scale extends Transformation {

    private final Vector3D scaleVec;

    /**
     * Construct new scale transformation from a vector whose components
     * specify scaling in each direction.
     * 
     * @param scaleVec scale vector
     */
    public Scale(Vector3D scaleVec) {
        this.scaleVec = scaleVec;
    }

    /**
     * Construct new scale transformation from individual X, Y and Z
     * scaling magnitudes.
     * 
     * @param scaleX
     * @param scaleY
     * @param scaleZ 
     */
    public Scale(double scaleX, double scaleY, double scaleZ) {
        this.scaleVec = new Vector3D(scaleX, scaleY, scaleZ);
    }

    /**
     * Construct new scale transformation that scales an object uniformly
     * in all directions.
     * 
     * @param scale scale factor
     */
    public Scale(double scale) {
        this.scaleVec = new Vector3D(scale, scale, scale);
    }

    @Override
    public Vector3D apply(Vector3D vec) {
        return new Vector3D(vec.getX() * scaleVec.getX(), vec.getY() * scaleVec.getY(),
                vec.getZ() * scaleVec.getZ());
    }

    @Override
    public Vector3D applyInverse(Vector3D vec) {
        return new Vector3D(vec.getX() / scaleVec.getX(), vec.getY() / scaleVec.getY(),
                vec.getZ() / scaleVec.getZ());
    }

}