CoordinateSpace.java :  » Remote » remotedroid » com » joshsera » Android Open Source

package com.joshsera;

/**
 * Stores 3 vectors representing a coordinate space.
 * 
 * @author jsera
 *
 */

public class CoordinateSpace {
  public Point3D x;
  public Point3D y;
  public Point3D z;
  
  /**
   * creates a default coordinaqte space
   */
  
  public CoordinateSpace() {
    this.x = new Point3D();
    this.x.x = 0;
    this.x.y = 1;
    this.x.z = 0;
    this.y = new Point3D();
    this.y.x = 0;
    this.y.y = 0;
    this.y.z = 1;
    this.z = new Point3D();
    this.z.x = 1;
    this.z.y = 0;
    this.z.z = 0;
  }
  
  /**
   * creates a coordinate space from the given vectors. You're responsible for normalizing everything
   * and making sure everything's in order.
   * @param x
   * @param y
   * @param z
   */
  
  public CoordinateSpace(Point3D x, Point3D y, Point3D z) {
    this.x = x;
    this.y = y;
    this.z = z;
  }
  
  /**
   * Creates a coordinate space from two vectors. You're responsible for making sure they're not the
   * same vector, or that one's not just the reverse of the other.
   * @param a
   * @param m
   */
  public CoordinateSpace(float[] a, float[] m) {
    Point3D.copy(a, this.y = new Point3D());
    this.z = new Point3D();
    Point3D.cross(a, m, this.z);
    this.x = new Point3D();
    Point3D.cross(this.z, this.y, this.x);
    // normalize everything
    Point3D.normalize(this.x);
    Point3D.normalize(this.y);
    Point3D.normalize(this.z);
  }
  
  //
  
  public void setSpace(float[] a, float[] m) {
    //
    a[1] *= -1;
    //
    m[1] *= -1;
    m[2] *= -1;
    //
    Point3D.copy(a, this.z);
    Point3D.cross(a, m, this.y);
    Point3D.cross(this.z, this.y, this.x);
    // normalize everything
    Point3D.normalize(this.x);
    Point3D.normalize(this.y);
    Point3D.normalize(this.z);
  }
  
  public void setSpace(Point3D a, Point3D m) {
    // Make things match the screen space.
    a.y *= -1;
    //
    m.y *= -1;
    m.z *= -1;
    //
    Point3D.copy(a, this.z);
    Point3D.cross(a, m, this.y);
    Point3D.cross(this.z, this.y, this.x);
    // normalize everything
    Point3D.normalize(this.x);
    Point3D.normalize(this.y);
    Point3D.normalize(this.z);
    //
  }
  
  public void copy(CoordinateSpace c) {
    Point3D.copy(c.x, this.x);
    Point3D.copy(c.y, this.y);
    Point3D.copy(c.z, this.z);
  }
}