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Position.as
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Position.as
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/*
* FLINT PARTICLE SYSTEM
* .....................
*
* Author: Richard Lord
* Copyright (c) Richard Lord 2008-2011
* 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;
import org.flintparticles.twoD.zones.Zone2D;
import flash.geom.Point;
[DefaultProperty("zone")]
/**
* The Position Initializer sets the initial location of the particle.
*
* <p>The class uses zones to place the particle. A zone defines a region
* in relation to the emitter and the particle is placed at a random point within
* that region. For precise placement, the Point zone defines a single
* point at which all particles will be placed. Various zones (and the
* Zones interface for use when implementing custom zones) are defined
* in the org.flintparticles.twoD.zones package.</p>
*/
public class Position extends InitializerBase
{
private var _zone : Zone2D;
/**
* The constructor creates a Position initializer for use by
* an emitter. To add a Position to all particles created by an emitter, use the
* emitter's addInitializer method.
*
* @param zone The zone to place all particles in.
*
* @see org.flintparticles.common.emitters.Emitter#addInitializer()
*/
public function Position( zone : Zone2D = null )
{
this.zone = zone;
}
/**
* The zone.
*/
public function get zone():Zone2D
{
return _zone;
}
public function set zone( value:Zone2D ):void
{
_zone = value;
}
/**
* @inheritDoc
*/
override public function initialize( emitter : Emitter, particle : Particle ) : void
{
var p:Particle2D = Particle2D( particle );
var loc:Point = _zone.getLocation();
if( p.rotation == 0 )
{
p.x += loc.x;
p.y += loc.y;
}
else
{
var sin:Number = Math.sin( p.rotation );
var cos:Number = Math.cos( p.rotation );
p.x += cos * loc.x - sin * loc.y;
p.y += cos * loc.y + sin * loc.x;
}
p.previousX = p.x;
p.previousY = p.y;
}
}
}