/*
Research Project:   Graphical Database for Category Theory
                    J. Bradbury, Dr. R. Rosebrugh, I. Rutherford
                    Mount Allison University 2001
File:               DPoint.java
                    (author: Larry Barowski, Auburn University, 7/7/96)
Description:	      A class for holding a real 3D position.
*/

   public class DPoint3
   {
      public double	x, y, z;
   
   
      public DPoint3()
      {
      }
   
   
      public DPoint3(double x_in, double y_in, double z_in)
      {
         x = x_in;
         y = y_in;
         z = z_in;
      }
   
   
      public DPoint3(DPoint3 init)
      {
         x = init.x;
         y = init.y;
         z = init.z;
      }
   
   
      public boolean equals(DPoint3 other)
      {
         if(other.x != x || other.y != y || other.z != z)
            return false;
         return true;
      }
   
   
      public void move(double new_x, double new_y, double new_z)
      {
         x = new_x;
         y = new_y;
         z = new_z;
      }
   
   
   
      public void move(DPoint3 newpt)
      {
         x = newpt.x;
         y = newpt.y;
         z = newpt.z;
      }
   
   
   
      public void translate(double x_shift, double y_shift, double z_shift)
      {
         x += x_shift;
         y += y_shift;
         z += z_shift;
      }
   
      public void transform(Matrix44 matrix)
      {
         double x2, y2, z2, w2;
         double	mat[][] = matrix.matrix;
      
         x2 = mat[0][0] * x + mat[0][1] * y + mat[0][2] * z + mat[0][3];
         y2 = mat[1][0] * x + mat[1][1] * y + mat[1][2] * z + mat[1][3];
         z2 = mat[2][0] * x + mat[2][1] * y + mat[2][2] * z + mat[2][3];
         w2 = mat[3][0] * x + mat[3][1] * y + mat[3][2] * z + mat[3][3];
      
         x = x2 / w2;
         y = y2 / w2;
         z = z2 / w2;
      }
   
   }