/*
*
* Created: Jun 7 2006
*
* Copyright (C) 1999-2000 Fabien Sanglard
*
* 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.
*/
package rtype.entity;
import org.lwjgl.util.vector.Vector2f;
public class GLUTILS
{
public static Vector2f makeNormalForPoints(Vector2f p1, Vector2f p2)
{
float diffY = p2.y - p1.y;
float diffX = p2.x - p1.x;
return new Vector2f(-diffY/diffX,1);
}
public static void rotateAroundZ(Vector2f vector, float angleRadian)
{
double cosAngle = Math.cos(angleRadian);
double sinAngle = Math.sin(angleRadian);
float savecValue =vector.x;
vector.x = (float) (vector.x * cosAngle - vector.y * sinAngle);
vector.y = (float) (savecValue * sinAngle + vector.y * cosAngle) ;
}
public static float degresToRadians(float degres)
{
return (float)(degres * 2 * Math.PI / 360);
}
public static float radiansToDegres(float radians)
{
return (float)( 360 * radians / (2 * Math.PI));
}
}