/*
* Apollo - Motion capture and animation system
* Copyright (c) 2005 Apollo
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* http://www.gnu.org/copyleft/gpl.html
*
* @author Giovane.Kuhn - brain@netuno.com.br
*
*/
package org.apollo;
import javax.vecmath.Vector2d;
/**
* Class with a set of util functions for geometry
* @author Giovane.Kuhn on 03/06/2005
*/
public final class GeometryUtil {
private GeometryUtil() {
// nop
}
/**
* Calculates cross product between vectors.
* v1 x v2 = { v1.x * v2.y - v1.y * v2.x }
* @param v1 First vector
* @param v2 Second vector
* @return Return cross product
*/
public static double cross(Vector2d v1, Vector2d v2) {
return v1.x * v2.y - v1.y * v2.x;
}
}
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