vector3.java

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package ergo.ui;

// $Id: Vector3.java,v 1.2 1999/08/13 01:20:11 sigue Exp $

/*
 *  Copyright (C) 1999  Carl L. Gay and Antranig M. Basman.
 *  See the file copyright.txt, distributed with this software,
 *  for further information.
 */

// A vector in R3

public class Vector3 {
  double x, y, z;
  Vector3() {};
  Vector3(double x, double y, double z) {
    this.x = x; this.y = y; this.z = z;
  }
  Vector3 norm() {
    double d = Math.sqrt(x*x + y*y + z*z);
    x/=d; y/=d; z/=d;
    return this;
  }
  void imbue(double x, double y, double z) {
    this.x=x; this.y=y; this.z=z;
  }
  double dot(Vector3 other) {
    return x*other.x + y*other.y + z*other.z;
  }
  static void subhorr(Vector3 target, Vector3 a, Vector3 b) {
    target.x = a.x - b.x; target.y = a.y - b.y; target.z = a.z - b.z;
  }
  static void addhorr(Vector3 target, Vector3 a, Vector3 b) {
    target.x = a.x + b.x; target.y = a.y + b.y; target.z = a.z + b.z;
  }
  static void scalehorr(Vector3 target, double f, Vector3 a) {
    target.x = f*a.x; target.y = f*a.y; target.z = f*a.z;
  }
}