/*
 * FLINT PARTICLE SYSTEM
 * .....................
 * 
 * Author: Richard Lord
 * Copyright (c) Richard Lord 2008-2010
 * http://flintparticles.org
 * 
 * 
 * Licence Agreement
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.flintparticles.twoD.initializers 
{
	import org.flintparticles.common.emitters.Emitter;
	import org.flintparticles.common.initializers.InitializerBase;
	import org.flintparticles.common.particles.Particle;
	import org.flintparticles.twoD.particles.Particle2D;	

	/**
	 * The RotationAbsolute Initializer sets the rotation of the particle. The rotation is
	 * independent of the rotation of the emitter.
	 */

	public class RotationAbsolute extends InitializerBase
	{
		private var _min : Number;
		private var _max : Number;

		/**
		 * The constructor creates a RotationAbsolute initializer for use by 
		 * an emitter. To add a RotationAbsolute to all particles created by an emitter, use the
		 * emitter's addInitializer method.
		 * 
		 * <p>The rotation of particles initialized by this class
		 * will be a random value between the minimum and maximum
		 * values set. If no maximum value is set, the minimum value
		 * is used with no variation.</p>
		 * 
		 * @param minAngle The minimum angle, in radians, for the particle's rotation.
		 * @param maxAngle The maximum angle, in radians, for the particle's rotation.
		 * 
 		 * @see org.flintparticles.common.emitters.Emitter#addInitializer()
		 */
		public function RotationAbsolute( minAngle : Number = 0, maxAngle : Number = NaN )
		{
			this.minAngle = minAngle;
			this.maxAngle = maxAngle;
		}
		
		/**
		 * The minimum angle for particles initialised by 
		 * this initializer.
		 */
		public function get minAngle():Number
		{
			return _min;
		}
		public function set minAngle( value:Number ):void
		{
			_min = value;
		}
		
		/**
		 * The maximum angle for particles initialised by 
		 * this initializer.
		 */
		public function get maxAngle():Number
		{
			return _max;
		}
		public function set maxAngle( value:Number ):void
		{
			_max = value;
		}
		
		/**
		 * When reading, returns the average of minAngle and maxAngle.
		 * When writing this sets both maxAngle and minAngle to the 
		 * same angle value.
		 */
		public function get angle():Number
		{
			return _min == _max ? _min : ( _max + _min ) / 2;
		}
		public function set angle( value:Number ):void
		{
			_max = _min = value;
		}
		
		/**
		 * @inheritDoc
		 */
		override public function initialize( emitter : Emitter, particle : Particle ) : void
		{
			var p:Particle2D = Particle2D( particle );
			if( isNaN( _max ) )
			{
				p.rotation = _min;
			}
			else
			{
				p.rotation = _min + Math.random() * ( _max - _min );
			}
		}
	}
}
