forked from: flash on 2010-2-11

by guillaume_guillaume 03 Dec 2010

Embed

/**
 * Copyright guillaume_guillaume ( http://wonderfl.net/user/guillaume_guillaume )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/owPR
 */

// forked from hig_an's flash on 2010-2-11
//forked from hig_an's snow
package {
    import flash.display.SpreadMethod;
    import flash.display.Sprite;
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.BlendMode;
    import flash.display.PixelSnapping;
    import flash.events.Event;
    import flash.filters.BlurFilter;
    import flash.geom.Matrix;
    import flash.geom.Point;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextFormat;
    import net.hires.debug.Stats;
    
    [SWF(width=465,height=465,backgroundColor=0x000000,frameRate=60)]
    public class Saq001 extends Sprite {
        private static const GRAVITY:Number = 20;
        private static const DRAG:Number = 0.3;
        
        private var _canvas:BitmapData;
        private var _glow:BitmapData;
        private var _glowMtx:Matrix;
        private var _forceMap:BitmapData;
        private var _snow:Array;
        
        public function Saq001():void {
            this._canvas = new BitmapData(465, 465, false, 0x0);
            this.addChild(new Bitmap(this._canvas)) as Bitmap;
            
            this._glow = new BitmapData(465 / 4, 465 / 4, false, 0x0);
            var bm:Bitmap = this.addChild(new Bitmap(this._glow, PixelSnapping.NEVER, true)) as Bitmap;
            bm.scaleX = bm.scaleY = 4;
            bm.blendMode = BlendMode.ADD;
            this._glowMtx = new Matrix(0.25, 0, 0, 0.25);
            
            var tf:TextField = new TextField();
            tf.defaultTextFormat = new TextFormat('Verdana', 64, 0xffffff, true);
            tf.autoSize = TextFieldAutoSize.LEFT;
            tf.text = "salut tout le monde";
            tf.x = (465 - tf.width) / 2;
            tf.y = (465 - tf.height) / 2;
            this._forceMap = new BitmapData(465, 465, false, 0x0);
            this._forceMap.draw(tf, tf.transform.matrix);
            this._forceMap.applyFilter(this._forceMap, this._forceMap.rect, new Point(0, 0), new BlurFilter(8, 8));
            
            this._snow = [];
            this.addChild(new Stats());;
            this.addEventListener(Event.ENTER_FRAME, this.updata);
        }
        public function emitParticle(ex:Number, ey:Number, s:Number = 1, c:int = 0xffffff, vx:Number = 0, vy:Number = 0):void {
            var p:SnowParticle = new SnowParticle();
            p.x = ex;
            p.y = ey;
            p.vx = vx;
            p.vy = vy;
            p.s = s;
            p.c = c;
            this._snow.push(p);
        }
        
        
        public function updata(e:Event):void {
            this._canvas.lock();
            this._canvas.fillRect(this._canvas.rect, 0x0);
            var n:int = this._snow.length;
            var d:Number;
            var gravity:Number = GRAVITY / 1000;
            while (n--) {
                var p:SnowParticle = this._snow[n];
                p.vy += gravity * p.s;
                p.vx *= 0.99;
                p.vy *= 0.99;
                d = 1 - (this._forceMap.getPixel(p.x, p.y) / 0xffffff) * DRAG;
                p.vx *= d;
                p.vy *= d;
                p.x += p.vx;
                p.y += p.vy;
                this._canvas.setPixel(p.x, p.y, p.c);
                if (p.x > this.stage.stageWidth) {
                this._snow.splice(n, 1);    
                }
            }
            this._canvas.unlock();
            this._glow.draw(this._canvas, this._glowMtx);
            
            n = 10;
            while (n--) {
            this.emitParticle(Math.random() * this.stage.stageWidth, 0, Math.random() + 0.5);
            
            }
        }
    }
}
class SnowParticle {
    public var x:Number;
    public var y:Number;
    public var vx:Number;
    public var vy:Number;
    public var s:Number;
    public var c:int;
    
    public function SnowParticle() {
    this.x = 0;
    this.y = 0;
    this.vx = 0;
    this.vy = 0;
    this.s = 1;
    this.c = 0xFFFFFF;
    }
}