289 - Translation Matrix

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

/** This class imlements matrices for translation (i.e. moving in space) */
public class TranslationMatrix extends Matrix {

   /** Creates a default matrix that translates by 0 in all directions.
    *  That is, it does nothing.
    */
   public TranslationMatrix(){

   }

   /** Create a translation matrix that will translate points (vertices) by
    *  by the specified distances for each axis.
    */
   public TranslationMatrix(double dx, double dy, double dz){
          float  [][] transform_matrix = {{1.0f, 0.0f, 0.0f, (float)dx},
                                          {0.0f, 1.0f, 0.0f, (float)dy},
                                          {0.0f, 0.0f, 1.0f, (float)dz},
                                          {0.0f, 0.0f, 0.0f, 1.0f}
                                         };

          matrix = transform_matrix;
   }

   /** Set the distances for all three axes.*/
   public void setDistances(double dx, double dy, double dz){
      // Write me!
       matrix[0][3] = (float)dx;
       matrix[1][3] = (float)dy;
       matrix[2][3] = (float)dz;

   }

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

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


}