Pixel Perfect Particles with Basic Physics

@author duarte peixinho
mail: duarte.peixinho@gmail.com
Pixel Perfect Particles with Basic Physics

forked:6
favorite:24
lines:181
license : All rights reserved
modified : 2009-03-05 09:34:21

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package
{
	import flash.display.Loader;
        import flash.system.LoaderContext;
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.events.TextEvent;
	import flash.geom.Rectangle;
	import flash.geom.Point;
	import flash.net.URLRequest;
	import flash.text.TextField;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFieldType;
	import flash.text.TextFormat;
	import flash.text.AntiAliasType;
	import flash.display.BlendMode;
	import flash.system.Security;
	import flash.display.Stage;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.display.StageQuality;
	
	/**
	 * @author duarte peixinho
	 * mail: duarte.peixinho@gmail.com
	 * Pixel Perfect Particles with Basic Physics
	 */
	
	[SWF(width = "600", height = "400", backgroundColor = "#000000", frameRate = "60")]	 
	
	public class Main extends Sprite 
	{
	
		private var loader:Loader = new Loader();
		private var imageSourceBitmapData:BitmapData;
		private var imageSource:Bitmap;
		private var mouseClicked:Boolean = false;
		private var Pixels:Array = new Array();
		private var text:TextField = new TextField();
		
		public function Main():void 
		{
			stage.quality = StageQuality.LOW;
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.align = StageAlign.TOP_LEFT;
			
                        Security.loadPolicyFile("http://duartepeixinho.comcrossdomain.xml");
                        Security.allowDomain("duartepeixinho.com");
			loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);
                            
                        var loaderContext:LoaderContext = new LoaderContext();
                        loaderContext.checkPolicyFile = true;

loader.load(new URLRequest("http://duartepeixinho.com/flash/bitmapdata1/logo.png"),loaderContext);

text.antiAliasType = AntiAliasType.ADVANCED;
			text.blendMode = BlendMode.LAYER;
			text.x = stage.stageWidth/2-text.width/2;
			text.y = stage.stageHeight/2;
			text.autoSize = TextFieldAutoSize.LEFT;
			text.setTextFormat(new TextFormat("Arial", 14, 0x303030, true));
			text.textColor = 0xffffff;
			text.selectable = false;
                        text.text="Loading Image...";
                        addChild(text);
				
		}
		private function onLoadComplete(e:Event):void {
			
			imageSource = Bitmap(e.target.loader.content);
			imageSourceBitmapData = imageSource.bitmapData;

// -------------------- creating scene -------------------------
                        removeChild(text);
                        text.text = "Click on the Screen";
			text.x = (stage.stageWidth) - text.width -10;
			text.y = stage.stageHeight - 30;			
			text.alpha = 0;
			addChild(text);

//enter frame
			addEventListener(Event.ENTER_FRAME, processframe);	
			stage.addEventListener(MouseEvent.CLICK, mouseClick);
			
			//--------------------- creating the pixels ------------------------			
			var l:int = 0;
			for (var i:int = 0; i < imageSource.width; i++)
				for (var k:int = 0; k < imageSource.height; k++) {							
					var pixelB:BitmapData = new BitmapData(1, 1);
					pixelB.copyPixels(imageSourceBitmapData, new Rectangle(i, k, i + 1, k + 1), new Point(0, 0));
					var Pixel:pixels = new pixels(this.stage,new Bitmap(pixelB), Math.round(stage.stageWidth/2 - imageSource.width / 2 + i),Math.round(stage.stageHeight / 2 - imageSource.height / 2 + k),Math.random() *6 - 3,Math.random() *-5-10,Math.round(Math.random()*100));
					Pixels.push(Pixel);
					addChild(Pixels[l].show());
					l++;									
				}
			
		}
		private function mouseClick(e:MouseEvent):void {
			if (!mouseClicked) mouseClicked = true;
			else mouseClicked = false;
		}
		
		private function processframe(e:Event):void 
		{
			//enter frame function
			//textfield
			if (text.alpha < 1) text.alpha += 0.01;
			
			for (var i:int = 0; i < Pixels.length; i++)	{
					Pixels[i].update();
					if (Pixels[i].moving != mouseClicked) {
						Pixels[i].moving = mouseClicked;					
						if (mouseClicked) {
							Pixels[i].animation++;
							Pixels[i].resetValues();
						}
						if (Pixels[i].animation == 5) Pixels[i].animation = 1;
					}
			}
		}
				
	}
	
}
	import flash.display.Bitmap;
	import flash.display.Stage;
	
	class pixels 
	{
		private var XposInit:Number;
		private var YposInit:Number;
		private var Xvel:Number;
		private var YvelInit:Number;
		private var Yvel:Number;
		
		//resize
		private var posXstage:Number;
		private var posYstage:Number;
		
		private var pixel:Bitmap;
		private var grav:Number = 0.98;
		private var time:Number;
		private var timeInit:Number;
		public var moving:Boolean = false;
		private var stage:Stage;
		//animations
		public var animation:uint = 0;
		
		public function pixels(stage:Stage, pixelB:Bitmap, x:Number, y:Number, XvelParam:Number = 0, YvelParam:Number = 0, timeParam:Number = 0):void
		{
			pixel = pixelB;
			XposInit = x;
			YposInit = y;			
			pixel.x = x;
			pixel.y = y;
			Xvel = XvelParam;
			Yvel = YvelParam;
			YvelInit = YvelParam;
			time = timeParam;			
			timeInit = timeParam;
			this.stage = stage;
			posXstage = pixel.x - stage.stageWidth / 2;
			posYstage = pixel.y - stage.stageHeight / 2;
		}
		
		public function show():Bitmap {		
			return pixel;
		}
		public function resetValues():void {
			//clear other animations
			time = timeInit;
			Yvel = YvelInit;
		}
		public function update():void {		
			
			// ----------------------------- resize ---------------- //
			if (XposInit - stage.stageWidth/2 != posXstage) {
				XposInit = Math.round(stage.stageWidth / 2 + posXstage);
			}
			if (pixel.y - stage.stageHeight != posYstage) {
				YposInit = Math.round(stage.stageHeight / 2 + posYstage);
			}
			
			if (moving) {
				//------------------------- animations here --------------------- //
				switch(animation) {
				case 1:			
					pixel.x = pixel.x + Math.random() * 6 - 3;
					pixel.y = pixel.y + Math.random() * 6 - 3;
					break;
				case 2:
					if (time == 0) {
						if (Yvel>0) pixel.y += grav +Yvel;
						else pixel.y += grav -Yvel;
					}
					else time--;
					break;						
				case 3:
				case 4:
					pixel.x += Xvel;
					pixel.y += Yvel;
					Yvel += grav;
					break;			
				}
				// -------------- physics here ----------------- //
				if ((animation == 3 || animation == 4) && pixel.y > stage.stageHeight) {
					Yvel = Yvel * -0.7;
					pixel.y = -Math.random() * Yvel  +stage.stageHeight;
					if (animation == 4) {
						pixel.x = stage.stageWidth/2;
					}
				}
			}
			else {
				pixel.x += (XposInit - pixel.x) / 4;
				pixel.y += (YposInit - pixel.y) / 4;
			}			
		}
		
	}

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