/*
 * Copyright 2011-2012 Arx Libertatis Team (see the AUTHORS file)
 *
 * This file is part of Arx Libertatis.
 *
 * Arx Libertatis 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.
 *
 * Arx Libertatis 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 Arx Libertatis.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "math/Angle.h"

float AngleDifference(float d, float e) {
	
	float da = e - d;
	
	if(da > 180.f) {
		da -= 360.f;
	} else if(da < -180.f) {
		da += 360.f;
	}
	
	return da;
}

float InterpolateAngle(float a1, float a2, const float pour) {
	
	float a = MAKEANGLE(a1);
	
	float diff = AngleDifference(a, MAKEANGLE(a2));
	
	return MAKEANGLE(a + (diff * pour));
}
