289 - Scaling Matrix

//
//  ScalingMatrix.java
//  Easel
//
//  Created by Philip Rhodes on 7/31/05.
//  Copyright 2005 __MyCompanyName__. All rights reserved.
//

/** This class implements matrices for scaling. */
public class ScalingMatrix extends Matrix{

   /** Creates a default matrix that scales all dimensions by
    *  1.0. That is, it does nothing.
    */
   public ScalingMatrix(){

   }

   /** Creates a scaling matrix that scales by the factors specified as
    *  parameters.
    */
   public ScalingMatrix(double xscale, double yscale, double zscale){
          float  [][] scale_matrix = {{(float)xscale, 0.0f,          0.0f,          0.0f},
                                      {0.0f,          (float)yscale, 0.0f,          0.0f},
                                      {0.0f,          0.0f,          (float)zscale, 0.0f},
                                      {0.0f,          0.0f,          0.0f,          1.0f}
                                     };

          matrix = scale_matrix;
   }

   /** Set the scale factors to the given values.*/
   public void setScales(double xscale, double yscale, double zscale){
      // Write me!
       matrix[0][0] = (float)xscale;
       matrix[1][1] = (float)yscale;
       matrix[2][2] = (float)zscale;
   }

   /** Calling copy on a scaling matrix is dangerous, since the result might not
    *  be a scaling matrix.
    */
   public void copy(Matrix m){

      System.out.println("ScalingMatrix.java: copy(Matrix) can only be called on a generic Matrix.");
      System.exit(1);
   }


}