TransformContext.java

/*******************************************************************************
 * Copyright 2010 Simon Mieth
 * 
 * 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.kabeja.math;

public class TransformContext {
    private double[][] transformMatrix;

    private double rotationAngle = 0.0;

    private double scaleX = 1.0;

    private double scaleY = 1.0;

    private double scaleZ = 1.0;

    private Vector translation = new Vector(1.0, 1.0, 1.0);

    public TransformContext() {
        transformMatrix = new double[][] { { 1.0, 0.0, 0.0, 0.0 },
                { 0.0, 1.0, 0.0, 0.0 }, { 0.0, 0.0, 1.0, 0.0 },
                { 0.0, 0.0, 0.0, 1.0 } };
    }

    public TransformContext(double[][] transformMatrix)
            throws IllegalArgumentException {
        if ((transformMatrix.length != 4) && (transformMatrix[0].length != 4)) {
            throw new IllegalArgumentException(
                    "Not a valid tranformation matrix.");
        }

        this.transformMatrix = transformMatrix;
    }

    public double getRotationZAxis() {
        return rotationAngle;
    }

    public void setRotationZAxis(double rotationAngle) {
        this.rotationAngle = rotationAngle;
    }

    public void setScale(double s) {
        this.setScale(s, s, s);
    }

    public void appendScale(double x, double y, double z) {
        this.scaleX = x;
        this.scaleY = y;
        this.scaleZ = z;

        double[][] m = new double[][] { { x, 0.0, 0.0, 0.0 },
                { 0.0, y, 0.0, 0.0 }, { 0.0, 0.0, z, 0.0 },
                { 0.0, 0.0, 0.0, 1.0 } };
        this.transformMatrix = MathUtils.multiplyMatrixByMatrix(m,
                this.transformMatrix);
    }

    public void setScale(double x, double y, double z) {
        this.scaleX = x;
        this.scaleY = y;
        this.scaleZ = z;

        double[][] m = new double[][] { { x, 0.0, 0.0, 0.0 },
                { 0.0, y, 0.0, 0.0 }, { 0.0, 0.0, z, 0.0 },
                { 0.0, 0.0, 0.0, 1.0 } };
        this.transformMatrix = MathUtils.multiplyMatrixByMatrix(
                this.transformMatrix, m);
    }

    public double getScaleX() {
        return scaleX;
    }

    public void setScaleX(double scaleX) {
        this.setScale(scaleX, 1.0, 1.0);
    }

    public double getScaleY() {
        return scaleY;
    }

    public void setScaleY(double scaleY) {
        this.setScale(1.0, scaleY, 1.0);
    }

    public double getScaleZ() {
        return scaleZ;
    }

    public void setScaleZ(double scaleZ) {
        this.setScale(1.0, 1.0, scaleZ);
    }

    public double[][] getTransformMatrix() {
        return transformMatrix;
    }

    public void setTransformMatrix(double[][] transformMatrix) {
        this.transformMatrix = transformMatrix;
    }

    public Vector getTranslation() {
        return translation;
    }

    public void setTranslation(Vector translation) {
        this.translation = translation;

        double[][] m = new double[][] { { 1.0, 0.0, 0.0, translation.getX() },
                { 0.0, 1.0, 0.0, translation.getY() },
                { 0.0, 0.0, 1.0, translation.getZ() }, { 0.0, 0.0, 0.0, 1.0 } };
        this.transformMatrix = MathUtils.multiplyMatrixByMatrix(
                this.transformMatrix, m);
    }
    
    public void appendTranslation(Vector translation){

        double[][] m = new double[][] { { 1.0, 0.0, 0.0, translation.getX() },
                { 0.0, 1.0, 0.0, translation.getY() },
                { 0.0, 0.0, 1.0, translation.getZ() }, { 0.0, 0.0, 0.0, 1.0 } };
        this.transformMatrix = MathUtils.multiplyMatrixByMatrix(
                 m,this.transformMatrix);
    }

    public Point3D transform(Point3D a) {
        double[] v = new double[] { a.getX(), a.getY(), a.getZ(), 1.0 };
        v = MathUtils.multiplyMatrixByVector(this.transformMatrix, v);

        Point3D p = new Point3D(v[0], v[1], v[2]);

        return p;
    }

    public void debug() {
        System.out.println("TransformMatrix");
        System.out.println(this.transformMatrix[0][0] + "\t"
                + this.transformMatrix[0][1] + "\t"
                + this.transformMatrix[0][2] + "\t"
                + this.transformMatrix[0][3]);
        System.out.println(this.transformMatrix[1][0] + "\t"
                + this.transformMatrix[1][1] + "\t"
                + this.transformMatrix[1][2] + "\t"
                + this.transformMatrix[1][3]);
        System.out.println(this.transformMatrix[2][0] + "\t"
                + this.transformMatrix[2][1] + "\t"
                + this.transformMatrix[2][2] + "\t"
                + this.transformMatrix[2][3]);
        System.out.println(this.transformMatrix[3][0] + "\t"
                + this.transformMatrix[3][1] + "\t"
                + this.transformMatrix[3][2] + "\t"
                + this.transformMatrix[3][3]);
        System.out.println();

    }
}