Pi Calculate

by Qwaz 08 Mar 2012

Tags

Circle, Math Pi, QwazLab,
Embed

/**
 * Copyright Qwaz ( http://wonderfl.net/user/Qwaz )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/xii2
 */

package {
    import com.bit101.components.PushButton;
    
    import flash.display.Bitmap;
    import flash.display.Sprite;
    import flash.display.BitmapData;
    import flash.events.Event;
    import flash.geom.Point;
    
    [SWF(width=465, height=465)]
     
    public class Main extends Sprite {
        
        private const CALC_PER_FRAME:int = 3000;
        private const DARK_CONST:Number = 0.995;
        
        private var middle:Point;
        private var radius:int;
        
        private var bmd:BitmapData;
        private var bm:Bitmap;
        private var pt:Point = new Point();
        
        private var pi:PushButton;
        private var allView:PushButton;
        private var cntView:PushButton;
        
        private var all:Number=0;
        private var cnt:Number=0;
        
        public function Main():void {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
            
            addEventListener(Event.ENTER_FRAME, enterFrameHandler);
        }
        
        private function init(e:Event=null):void {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            
            middle = new Point(stage.stageWidth / 2, stage.stageHeight / 2);
            radius = stage.stageWidth / 2;
            
            bmd = new BitmapData(stage.stageWidth, stage.stageHeight, false);
            bm = new Bitmap(bmd);
            this.graphics.beginFill(0xFF7777);
            this.graphics.drawCircle(stage.stageWidth / 2, stage.stageHeight / 2, stage.stageWidth / 2);
            bmd.draw(this);
            this.graphics.clear();
            
            this.addChild(bm);
            
            pi = new PushButton(this);
            
            allView = new PushButton(this, 0, pi.y + pi.height);
            
            cntView = new PushButton(this, 0, allView.y + allView.height);
        }
        
        private function enterFrameHandler(e:Event):void {
            var i:int;
            for (i = 0; i < CALC_PER_FRAME; i++) {
                pt.x = Math.random() * stage.stageWidth;
                pt.y = Math.random() * stage.stageHeight;
                
                all++;
                if (Point.distance(pt, middle) <= radius) cnt++;
                
                bmd.setPixel(pt.x, pt.y, darken(bmd.getPixel(pt.x, pt.y)));
            }
            pi.label = String(((cnt / all) * 4).toFixed(10));
            allView.label = String(all);
            cntView.label = String(cnt);
        }
        
        private function darken(num:uint):uint {
            var r:uint = num >> 16;
            var g:uint = (num & 0xFFFF) >> 8;
            var b:uint = (num & 0xFF);
            
            r *= DARK_CONST;
            g *= DARK_CONST;
            b *= DARK_CONST;
            
            return (r << 16) + (g << 8) + b;
        }
        
    }
    
}