Android Open Source - Look Triangle

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License

The source code is released under:

====================== LOOK! LICENSING TERMS ====================== look! is licensed under the BSD 3-Clause (also known as "BSD New" or "BSD Simplified"), as follows: Copyright (c) 2010-2012, Look...

Java Source Code

/**
*-----------------------------------------------------------------------------
* Copyright (c) 2012, Look! Development Team
* All rights reserved./*from  w ww .  j  av  a  2 s. c o m*/
*
* Distributed under the terms of the BSD Simplified License.
*
* The full license is in the LICENSE file, distributed with this software.
*-----------------------------------------------------------------------------
*/
package es.ucm.look.ar.math.geom;

/**
 * Represents a geometric triangle
 * 
 * @author ??ngel Serrano
 * 
 */
public class Triangle {

  private Point3 p1, p2, p3;
  
  private Vector3 normal;

  /**
   * Constructs a triangle from 3 points
   * 
   * @param p1
   *            Point 1
   * @param p2
   *            Point 2
   * @param p3
   *            Point 3
   */
  public Triangle(Point3 p1, Point3 p2, Point3 p3) {
    this.p1 = p1;
    this.p2 = p2;
    this.p3 = p3;
    this.normal = Vector3.normalVector(p1, p2, p3);
  }

  /**
   * Returns the plain that contains this triangle
   * 
   * @return the plain that contains this triangle
   */
  public Plane getPlane() {
    return new Plane(p1, p2, p3);
  }

  /**
   * Returns if the given point is contained in this triangle.
   * 
   * @param p
   *            the point. It must be contained in the same plane as the
   *            triangle
   * @return <b>true</b> if the point is contained by the triangle,
   *         <b>false</b> otherwise
   */
  public boolean contains(Point3 p) {
    int max = normal.getGreatestComponent();
    Point2 p1 = new Point2(this.p1, max);
    Point2 p2 = new Point2(this.p2, max);
    Point2 p3 = new Point2(this.p3, max);
    Point2 i = new Point2(p, max);

    return (checkSide(p1, p2, i) == checkSide(p2, p3, i)) && (checkSide(p1, p2, i) == checkSide(p3, p1, i));
  }

  private int checkSide(Point2 o, Point2 d, Point2 p) {
    return (int) Math.signum(-(d.y - o.y) * (p.x - o.x) + (d.x - o.x) * (p.y - o.y));
  }

  /**
   * Returns a 3 elements array with the points
   * 
   * @return a 3 elements array with the points
   */
  public Point3[] getPoints() {
    return new Point3[] { p1, p2, p3 };
  }

}

Java Source Code List

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