forked from: forked from: Smoke of cigarette

by nkheart4 10 Aug 2011

• Forked from hacker_7z56ro6o's forked from: Smoke of cigarette
• Diff: 5
• Related works: 5

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/**
 * Copyright nkheart4 ( http://wonderfl.net/user/nkheart4 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/y1wD
 */

// forked from hacker_7z56ro6o's forked from: Smoke of cigarette
// forked from Kay's Smoke of cigarette
// forked from Kay's コレを煙にします
package {
    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;
    
    [SWF(width=465,height=465,backgroundColor=0xFFFFFF ,frameRate=24)]
    
    public class Main extends Sprite {
        
        private const SW:Number = stage.stageWidth;
        private const SH:Number = stage.stageHeight;
        private var hNum:uint = 200;
        private var vNum:uint = 200;
        private var noise:Texture;
        
        public function Main():void {
            noise = new Texture(hNum, vNum);
            addEventListener(Event.ENTER_FRAME, xRun);
            
            var bm:Bitmap = new Bitmap(noise);
            addChild(bm);
            
            // 煙を描画
            // Filterをかけると激重になるため、Lineだけで描画するもAlphaのせいで重い
            for (var i:uint = 0; i < 32; i++) {
                var nX:uint = 0;
                var nY:uint = i;
                var smoke:Smoke = new Smoke(noise, new Point(nX,nY));
                smoke.x = SW/2;
                smoke.y = SH;
                smoke.age = i*1;
                addChild(smoke);
            }
        }
        private function xRun(e:Event):void {
            noise.xDraw(-2,-2);
        }
    }
}

import flash.display.*;
import flash.geom.*;
import flash.events.*;
/*
 * 座標取得用のBitmapを生成
 */
class Texture extends BitmapData {
    public var point:Point = new Point(0,0);
    private var seed:uint = Math.floor(Math.random() * 10);
    private var channels:uint = BitmapDataChannel.RED | BitmapDataChannel.GREEN;
    public function Texture (w:uint=200, h:uint=200) {
        super(w, h, true, 0xffffffff);
    }
    public function xDraw(pX:Number, pY:Number):void {
        point.x += pX;
        point.y += pY;
        perlinNoise(50, 50, 4, seed, false, true, channels, false, [point]);
    }
}
/*
 * Bitmapから読み取った座標をもとにLineだけで煙を表現
 */
class Smoke extends Shape {
    public var noise:BitmapData;
    public var bmPoint:Point;
    public var age:uint = 0;
    public function Smoke(bmd:BitmapData, p1:Point):void {
        noise = bmd;
        bmPoint = p1;
        addEventListener(Event.ENTER_FRAME, xDraw);
    }
    private function xDraw(e:Event):void {
        var nX:Number = 0;
        var nY:Number = 0;
        graphics.clear();
        graphics.lineStyle(5, 0x333333 , 0.02);
        graphics.moveTo(nX,nY);
        // 長さを変えることで立ち上りを表現する
        var limit:uint = age*2+12;
        for (var i:uint = 0; i < limit; i++) {
            var nColor:uint = noise.getPixel(bmPoint.x+i,bmPoint.y+i);
            var colors:Array = toRGB(nColor);
            nX += (colors[0]-128)/16;
            nY += (colors[1]-48)/-8;
            graphics.lineTo(nX,nY);
            if (nY < -465) break;
        }
        age++;
        if (age > 32) age -= 32;
    }
    private function toRGB(nColor:uint):Array {
        var nB:uint = nColor & 0xff;
        var nG:uint = (nColor >> 8) & 0xff;
        var nR:uint = (nColor >> 16) & 0xff;
        return ([nR, nG, nB]);
    }
}