2D紙ふぶき forked from: bouncing balls in 3d space(3)

紙ふぶきっぽくしてみるw

by harupiyo 16 Dec 2009

• Forked from harupiyo's forked from: forked from: bouncing balls in 3d space(3)
• Diff: 193
• Related works: 6
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/**
 * Copyright harupiyo ( http://wonderfl.net/user/harupiyo )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/wf56
 */

// forked from harupiyo's forked from: forked from:  bouncing balls in 3d space(3)
// forked from uwi's forked from:  bouncing balls in 3d space(3)
// forked from k__'s  bouncing balls in 3d space(3)
// forked from k__'s bouncing balls in 3d space
// 紙ふぶきっぽくしてみるw

package {
	import flash.utils.IDataInput;
	import flash.accessibility.Accessibility;
	import flash.display.*;
	import flash.events.*;
	import flash.filters.*;
	import flash.geom.*;
    import net.hires.debug.Stats;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	
    [SWF(frameRate=60)]

	public class Main extends Sprite {
		private var particles:Array = [];
		private var canvas:BitmapData;
		
		public function Main() {

            canvas = new BitmapData(stage.stageWidth,stage.stageHeight,false, 0x00000000 );
			addChild( new Bitmap(canvas) );

			addEventListener( Event.ENTER_FRAME, h_enterFrame );

            addChild(new Stats());
			createView();
		}

		private function h_enterFrame(evt:Event):void {
			if (Math.random() < 0.5) {
				particles.push( new Particle2D() );
				particles.push( new Particle2D() ); // twice
			}
			draw();
		}

	    private var bmd:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight,true,0x000000);
        
		private function draw():void {

			var i:int;
			var p2d:Object;

         	bmd.fillRect( bmd.rect, 0xFF000000 );

			for (i = particles.length - 1; i >= 0; i --) {
				particles[i].update();

				if (particles[i].life == 0) {
					if(i == particles.length - 1){
						particles.pop();
					}else{
						particles[i] = particles.pop();
					}
				}
			}

			for each(p2d in particles) {
				bmd.fillRect( new Rectangle( p2d.x, p2d.y, 5, 5 ), p2d.color );
			}

			canvas.lock();
			canvas.draw(bmd,null , null, BlendMode.NORMAL );
			canvas.unlock();
		}
		
		//なるほど、こうやってtrace の文字を出力しているのか
		private function createView():void {
			var t:TextField = new TextField();
			t.autoSize = TextFieldAutoSize.LEFT;
			t.textColor = 0xFFFFFFFF;
			addChild(t);
			trace = function(s:String):void { t.appendText(s + "\n"); };
		}
		private var trace:Function;
	}
}

class Particle2D {
	import flash.display.*;
	public var x:Number=0,y:Number=0;
	public var vx:Number=0,vy:Number=0;
	private var SCREEN_X_MAX:int = 550;
	private var SCREEN_Y_MAX:int = 450;
	public var life:int;
	public var color:uint;
	public var originalColor:uint;
	public var isReverse:Boolean;
	private var colors : Array = [
		0xFFFF9300,
		0xFF6DE20E,
		0xFFB011FD,
		0xFFF50107,
		0xFF0992F7
	];
	private function _getRandomColor():uint {
		return colors[ int(Math.random() * colors.length ) ];
	}
	
	function Particle2D() {
		x	= Math.random() * SCREEN_X_MAX;
		y	= 0;
		vy	= Math.random()*4 + 1;		// 落下速度
		life = 1;
		color = originalColor = _getRandomColor();
		isReverse = false;
	}

	public function update():void {
		// ゆらゆらゆれながら落下
		vx	= Math.random()*5-2.5;	// 左右にランダム移動

		if ( y >= SCREEN_Y_MAX ) {
			life=0;
		}
		if ( x <= 0 && SCREEN_X_MAX < x ) {
			life=0;
		}
		// たまに裏返る
		if( Math.random() > 0.9 ){
			_reverse();
		}
		
		x+=vx;
		y+=vy;
	}
	
	private function _reverse():void {
		if( isReverse ) {
			isReverse = false;
			color = originalColor;
		} 
		else{
			isReverse = true;
			color = 0xFFFFFFFF;	// 色紙なので裏面は白
		}
	}
}