/**
* barsuift-simlife is a life simulator programm
*
* Copyright (C) 2010 Cyrille GACHOT
*
* This file is part of barsuift-simlife.
*
* barsuift-simlife is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* barsuift-simlife is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with barsuift-simlife. If not, see
* <http://www.gnu.org/licenses/>.
*/
package barsuift.simLife.j3d.util;
import javax.media.j3d.TriangleArray;
import javax.vecmath.Point3d;
public final class AreaHelper {
private AreaHelper() {
// private constructor to enforce static access
}
/**
* Computes the area of the given triangle.
*
* @param triangle the triangle to compute area for
* @return the area of the triangle
*/
public static double computeArea(TriangleArray triangle) {
// retrieve triangle coordinates
Point3d p1 = new Point3d();
triangle.getCoordinate(0, p1);
Point3d p2 = new Point3d();
triangle.getCoordinate(1, p2);
Point3d p3 = new Point3d();
triangle.getCoordinate(2, p3);
// compute the triangle sides length
double a = p1.distance(p2);
double b = p2.distance(p3);
double c = p3.distance(p1);
// compute the semi perimeter
double s = (a + b + c) / 2;
// compute the area
double area = Math.sqrt(s * (s - a) * (s - b) * (s - c));
return area;
}
}