Usage of particle manager

So, here is a little how-to for subject.
First you need ParticleManager instance in your class (smoke for example)

smoke = new ParticlesManager(1000, ParticleState.Update_particle, true);
emitterPosition = new Point(stageWidth + 40, stageHeight / 3);
addChild(smoke);

Then in some loop of your game (EnterFrame?) you have to emit particles

var speed_x:Float = -20 * (Math.random()) - 20;
var speed_y:Float =  14 * (Math.random()) - 7;
var state:ParticleState = new ParticleState(new Point(speed_x, speed_y), 1);
smoke.Create_particle(Assets.getBitmapData("assets/round_20.png"), 
 new Point(emitterPosition.x, emitterPosition.y),
 0xff0000ff, 30, new Point(0.1, 0.1), state, 0, 0.2, 0.04); // look at ParticleManager code for params description

As you can see, you need ParticleState class for particles

package;

import flash.geom.Point;
import particles.Particle;

class ParticleState
{
    public var velocity:Point;
    public var lengthMultiplier:Float = 0.0;
 
 public function new(velocity:Point, lengthMultiplier:Float)
 {
  this.velocity = velocity;
  this.lengthMultiplier = lengthMultiplier;
 }
 
 public static function Update_particle(particle:Particle):Void //here you have to define how particles move
 {
  var vel:Point = particle.state.velocity;
  particle.position.x += vel.x;
  particle.position.y += vel.y;
  particle.bitmap.scaleX += (1 - particle.bitmap.scaleX) * particle.sizeReduction;
  particle.bitmap.scaleY += (1 - particle.bitmap.scaleX) * particle.sizeReduction;
  particle.bitmap.alpha -= particle.fading;
 }
}