Inverse Explosion Action

seithein — Mon, 03 May 2010 19:12:23 +0100

Hi,

First, thanks for sharing your awesome work. (And excuse my bad english)

I wish to inverse explosion action. Get the particules back to there original position (after a mouse click for exemple).
The pb is, the explosion is base on a Bitmap, so i don't use a Zone2D initialiser.
I can save particules positions at start and had a custom Action to get them back. but maybe there existing method that i didn't found.
If i inverse particules velocity i don't really know the best way to make them stop at original pos.
If i want to use TweenToZone, i don't have the starting Zone2D.
I tryed TweenToPosition but i don't think i can use it in this case.

All idea welcome,
thanks

Inverse Explosion Action

seithein — Thu, 06 May 2010 01:00:24 +0100

hello,

I post a solution if anyone interested. I m pretty sure there a better way to do that, so all advices are welcome.
(and again, thx for that great framework)

Emitter2D Class :


public class ImageExplode extends Emitter2D
{
	//_______________________________________________________________________________O	VAR	
	
	[Embed(source = "logo.png")]
	public var Logo:Class; 
	private var _exploded:Boolean = false;
	
	private var explosion:Explosion;
	private var moveToOrigin:MoveToOrigin;

	
	//_______________________________________________________________________________O	CONSTRUCTOR				
	public function ImageExplode() 
	{	
		// - setup bitmapDataParticules 
		var logo:Bitmap = new Logo();
		var particles:Array = Particle2DUtils.createRectangleParticlesFromBitmapData(logo.bitmapData, 10, particleFactory);
		addExistingParticles( particles, false );			
						
		// - save origin pos in dictionary // should build a initialiser
		var count:int = particles.length;				
		for (var i:int = 0; i < count; i++) {	
			particles[i].dictionary["xOrigin"] = particles[i].x;	
			particles[i].dictionary["yOrigin"] = particles[i].y;
		}	
		// - activate Move
		addAction(new Move());		
		
	}
	public function explode(pStageX:Number,pStageY:Number ):void
	{

		if (!_exploded) {	
			// - remove Action
			removeAction(moveToOrigin);
			// - setup Explosion
			explosion = new Explosion(0.5, pStageX, pStageY, 50 );
			addAction(explosion);									
			_exploded = true;
		}
		else {			
			// - remove Action
			removeAction(explosion);		
			// - go back to origin pos
			moveToOrigin = new MoveToOrigin(this)
			addAction (moveToOrigin);
			_exploded = false;
		}
	}					
}

Custom ActionBase class


public class MoveToOrigin extends ActionBase
{
	
	public function MoveToOrigin(emitter:Emitter)
	{
		for (var i:int = 0; i < emitter.particles.length; i++) {	
			emitter.particles[i].velX *= -1;
			emitter.particles[i].velY *= -1;
		}	

	}
	
	override public function update( emitter:Emitter, particle:Particle, time:Number ):void
	{
		var p:Particle2D = Particle2D( particle );
		if (p.velX > 0) {
			if (p.dictionary["xOrigin"] < p.x) {
				initPart(p);
			}
		}
		else {
			if (p.dictionary["xOrigin"] > p.x) {
				initPart(p);	
			}
		}
	}
	private function initPart(particule:Particle2D):void {
		particule.x = particule.dictionary["xOrigin"]; particule.velX = 0;
		particule.y = particule.dictionary["yOrigin"]; particule.velY = 0;	
	}		
}

Inverse Explosion Action

Richard — Tue, 18 May 2010 08:06:31 +0100

Thank you for sharing this.

Inverse Explosion Action

figure8 — Fri, 23 Jul 2010 12:32:50 +0100

oh, this could help me out as well. i'll give it a try - thanks!

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