Water Particles

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license : All rights reserved
modified : 2009-02-24 11:54:40

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package {
    import flash.display.*;
    import flash.events.*;
    import flash.text.*;
    import caurina.transitions.Tweener;
    [SWF(backgroundColor="#FFFFFF", frameRate=40)]
    public class FlashTest extends Sprite {
        private var _particles:Array = [];
        private var _label:TextField;
        public function FlashTest() {
            var rect :Sprite= new Rect( stage.stageWidth, stage.stageHeight );
            addChild( rect  );
            rect.addEventListener( MouseEvent.CLICK, onClick );
            rect.buttonMode = true;
            rect.useHandCursor = true;
            addEventListener( Event.ENTER_FRAME, onUpdate );

var t:TextField = new TextField();
            t.mouseEnabled = false;
            t.width = 200;
            t.defaultTextFormat = new TextFormat("_sans", 12, 0x333366 );
            t.text = "Please click to create particles.";
            t.x = ( stage.stageWidth - t.width ) *0.5;
            t.y = ( stage.stageHeight- t.height ) *0.5;
            t.alpha = 0;
            _label = t;
            addChild( t );
            Tweener.addTween( t, { alpha : 1, time:2, delay:0.3, transition:"easeInOutSine" } );
        }
        private function onClick( e:Event ) :void {
            var num:uint = 30;
            for( var i:int=0; i<num;++i ) {
                var p:Particle = new Water( Math.random()* 10+3, 0, Math.random()*10+50, Math.random()*15+10, Math.random()*10-5 );
                addChild(p);
                _particles.push( p );
            }
            if( _label ) Tweener.addTween( _label, { alpha : 0, time:2, delay:0.3, transition:"easeInOutSine", onComplete: onRemoveLabel } );
        }
        private function onRemoveLabel ():void {
            removeChild( _label );
            _label = null;
        }
        private function onUpdate( e:Event ):void  {
            var num:uint = _particles.length;
            var p:Particle;
            for( var i:int=0; i<num;++i ) {
                p = _particles[ i ] as Particle;
                if( p.checkLife() ) {
                    p.update();
                }
                else {
                    if( contains(p) ) removeChild( p );
                }
            }
        } 
    }
}
import flash.display.*;

class Particle extends Sprite {
    public static const G:Number = 1;
    public static const FRICTION_X:Number = 0.96;
    public static const FRICTION_Y:Number = 0.96;
    public var mass:Number=1;
    public var vx:Number=0;
    public var vy:Number=0;
    public static var LIMIT_Y:Number = 500;
    public function Particle ( smass:Number = 1,  sx:Number=0, sy:Number = 0, svx:Number=0, svy:Number=0 ) {
        mass = smass;
        x = sx;
        y = sy;
        vx = svx;
        vy = svy;
    }
    public function update():void {
        vy += G;
        vx *= FRICTION_X;
        vy *= FRICTION_Y;
        x += vx*mass;
        y += vy*mass;
    }
    public function checkLife() :Boolean {
        return y < LIMIT_Y;
    }
}

class Water extends Particle {
    public function Water( weight:Number, sx:Number=0, sy:Number = 0, svx:Number=0, svy:Number=0 ) {
        super( weight*0.1, sx, sy, svx, svy );
        graphics.beginFill( 0x6686ff, 0.5+Math.random()*0.4 );
        graphics.drawCircle( 0, 0, weight );
        graphics.endFill();
    }
}
class Rect extends Sprite {
    public function Rect( w:uint= 100, h:uint = 100 ) {
        graphics.beginFill( 0, 0 );
        graphics.drawRect( 0, 0, w, h );
        graphics.endFill();
    }
}

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