forked from: 雲海

夜空っぽくなったかな？
色の問題だけのような気もします

by eternity_hiro 17 Apr 2009

• Forked from civet's 雲海
• Diff: 20
• Related works: 4

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// forked from civet's 雲海
// 夜空っぽくなったかな？
// 色の問題だけのような気もします

package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.BitmapDataChannel;
    import flash.display.GradientType;
    import flash.display.SpreadMethod;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.TimerEvent;
    import flash.filters.DropShadowFilter;
    import flash.geom.ColorTransform;
    import flash.geom.Matrix;
    import flash.geom.Point;
    import flash.geom.Rectangle;
    import flash.utils.Timer;
    
    [SWF(frameRate='24', backgroundColor='0x000000')]
    public class Sora extends Sprite {
        private var source:BitmapData;
        private var sky:BitmapData;
        private var stars:Number = 40;
        private var rect:Rectangle;
        private var seed:int;
        private var offset:Point;
        private var trans:ColorTransform;        

        public function Sora() {
            createSky(stage.stageWidth, stage.stageHeight);
            createCloud(stage.stageWidth, stage.stageHeight);
        }
        
        private function createSky(w:uint, h:uint):void {
            var bg:Sprite = new Sprite();
            var colors:Array = [0x141c25, 0x1f2a36];
            var alphas:Array = [1, 1];
            var ratios:Array = [0x00, 0xFF];
            var mat:Matrix = new Matrix();
            mat.createGradientBox(w, h, Math.PI/2, 0, 0);
            bg.graphics.beginGradientFill(GradientType.LINEAR, colors, alphas, ratios, mat, SpreadMethod.PAD);
            bg.graphics.drawRect(0, 0, w, h);
            bg.graphics.endFill();
            
            sky = new BitmapData(w, h, true);
            sky.draw(bg);
            
            // 星たち
            for(var i:Number = 0; i < stars; i++) {
                sky.setPixel(Math.random() * w, Math.random() * h, 0x475769);
            }
            
            var bmp:Bitmap = new Bitmap(sky);
            addChild(bmp);
        }    

        private function createCloud(w:uint, h:uint):void {            
            source = new BitmapData(w, h, true, 0);
            var bmp:Bitmap = new Bitmap(source);
            addChild(bmp);
            //bmp.filters = [new DropShadowFilter(4, 45, 0xb3b3b3)];
            
            rect = new Rectangle(0, 0, source.width, source.height);
            seed = Math.random()*100;
            offset = new Point();
            trans = new ColorTransform(1,1,1,2, 45,60,80, -200);
            
            render();
            
            var t:Timer = new Timer(500);
            t.addEventListener(TimerEvent.TIMER, render);
            t.start();
        }

        private function render(e:Event=null):void {
            offset.x += 8;
            source.perlinNoise(256, 100, 4, seed, false, true, BitmapDataChannel.ALPHA, false, [offset]);
            source.colorTransform(rect, trans);
        }
    }
}