TestTwinkle

TestTwinkle

by ProjectNya 02 Feb 2011

Embed

/**
 * Copyright ProjectNya ( http://wonderfl.net/user/ProjectNya )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/kf1x
 */

////////////////////////////////////////////////////////////////////////////////
// TestTwinkle
////////////////////////////////////////////////////////////////////////////////

package {

    import flash.display.Sprite;
    import flash.geom.Rectangle;

    [SWF(backgroundColor="#333333", width="465", height="465", frameRate="60")]

    public class Main extends Sprite {
        private var twinkle:TwinkleEffect;

        public function Main() {
            //Wonderfl.capture_delay(1);
            init();
        }

        private function init():void {
            graphics.beginFill(0x333333);
            graphics.drawRect(0, 0, 465, 465);
            graphics.endFill();
            //
            var rect:Rectangle = new Rectangle(0, 0, 465, 465);
            var area:Rectangle = new Rectangle(182, 182, 100, 100);
            twinkle = new TwinkleEffect(rect, area);
            addChild(twinkle);
            twinkle.setup(100, 10);
            twinkle.start();
        }
        
    }

}


//////////////////////////////////////////////////
// TwinkleEffectクラス
//////////////////////////////////////////////////

import flash.display.Sprite;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.Rectangle;
import flash.geom.Matrix;
import flash.events.Event;
import flash.utils.Timer;
import flash.events.TimerEvent;

class TwinkleEffect extends Sprite {
    private var rect:Rectangle;
    private var area:Rectangle;
    private var bitmapData:BitmapData;
    private var bitmap:Bitmap;
    private static var radius:uint = 10;
    private var interval:uint = 100;
    private var life:uint = 10;
    private var particles:Array;
    private var unit:uint = 30;
    private var division:uint = 12;
    private static var radian:Number = Math.PI/180;
    private var timer:Timer;

    public function TwinkleEffect(r:Rectangle, a:Rectangle) {
        rect = r;
        area = a;
        init();
    }

    private function init():void {
        bitmapData = new BitmapData(rect.width, rect.height, true, 0x00000000);
        bitmap = new Bitmap(bitmapData);
        addChild(bitmap);
        particles = new Array();
    }
    public function setup(i:uint = 100, l:uint = 10):void {
        interval = i;
        life = l;
    }
    public function start():void {
        timer = new Timer(interval);
        timer.addEventListener(TimerEvent.TIMER, create, false, 0, true);
        timer.start();
        addEventListener(Event.ENTER_FRAME, update, false, 0, true);
    }
    public function stop():void {
        timer.stop();
        removeEventListener(Event.ENTER_FRAME, update);
    }
    private function create(evt:TimerEvent):void {
        var px:Number = area.x + Math.random()*area.width;
        var py:Number = area.y + Math.random()*area.height;
        plot(px, py);
    }
    private function plot(px:Number, py:Number):void {
        var matrix:Matrix = new Matrix();
        matrix.translate(px - radius, py - radius);
        var particle:TwinkleParticle = new TwinkleParticle();
        particle.x = px;
        particle.y = py;
        particle.life = life;
        particle.matrix = matrix;
        particle.color = 0xFFFFFF;
        particles.push(particle);
        bitmapData.lock();
        draw(px, py, 0xFFFFFF, life/life);
        bitmapData.unlock();
    }
    private function update(evt:Event):void {
        bitmapData.lock();
        bitmapData.fillRect(rect, 0x00000000);
        for (var n:uint = 0; n < particles.length; n++) {
            var particle:TwinkleParticle = particles[n];
            draw(particle.x, particle.y, particle.color, particle.life/life);
            particle.life --;
            if (particle.life < 0) {
                particles.splice(n, 1);
                particle = null;
            }
        }
        bitmapData.unlock();
    }
    private function draw(px:uint, py:uint, color:uint, percent:Number):void {
        var length:uint = uint(radius*percent);
        var argb:uint = 0xFF << 24 | color;
        for (var n:uint = 0; n < length; n++) {
            for (var a:uint = 0; a < 360; a+=unit) {
                var dx:Number = px + n*Math.cos(a*radian);
                var dy:Number = py + n*Math.sin(a*radian);
                bitmapData.setPixel32(dx, dy, argb);
            }
        }
    }

}


//////////////////////////////////////////////////
// TwinkleParticleクラス
//////////////////////////////////////////////////

import flash.geom.Matrix;

class TwinkleParticle {
    public var x:uint;
    public var y:uint;
    public var life:int;
    public var matrix:Matrix;
    public var color:uint;

    public function TwinkleParticle() {
    }

}