/* Une classe de manipulation de positions 3D           */
/*                                                      */
/* Auteur: Nicolas JANEY                                */
/* nicolas.janey@univ-fcomte.fr                         */
/* Octobre 2009                                         */

public class Position {
  public float x;
  public float y;
  public float z;
  public float w;

  public Position() {
    x = y = z = 0.0F;
    w = 1.0F;
  }

  public Position(float x,float y,float z) {
    this.x = x;
    this.y = y;
    this.z = z;
    w = 1.0F;
  }

  public Position(Position p) {
    x = p.x;
    y = p.y;
    z = p.z;
    w = 1.0F;
  }

  public float distance(Position p) {
    float dx = p.x - x;
    float dy = p.y - y;
    float dz = p.z - z;
    return((float) Math.sqrt(dx*dx + dy*dy + dz*dz));
  }

  public float carreDistance(Position p) {
    float dx = p.x - x;
    float dy = p.y - y;
    float dz = p.z - z;
    return(dx*dx + dy*dy + dz*dz);
  }
  
  public String toString() {
    return("["+x+","+y+","+z+"]");
  }
}