パーリンノイズ勉強曲線

パーリンノイズを作って、その色の値を使って曲線を描く。

forked:3
favorite:12
lines:45
license : MIT License
modified : 2011-01-17 16:53:16

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package
{
    import flash.display.BitmapData;
    import flash.display.BitmapDataChannel;
    import flash.display.Graphics;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.Point;
    
    [SWF(width="465", height="465", backgroundColor="0x000000", frameRate="30")]
    public class Main extends Sprite
    {
        private var bmpd:BitmapData;
        private var seed:Number;
        private var offset:Array;
        
        public function Main()
        {
            bmpd=new BitmapData(500, 100, false, 0xFFFFFF);
            seed=Math.floor(Math.random() * 10);
            offset=[new Point(0, 0), new Point(0, 0)];
            addEventListener(Event.ENTER_FRAME, onFrame);
        }
        
        private function onFrame(e:Event):void
        {
            // パーリンノイズを生成
            bmpd.perlinNoise(500, 500, 2, seed, true, true, BitmapDataChannel.RED, false, offset);
            offset[0].x += 10;
            offset[1].y += 1;
            
            // 曲線を描写
            graphics.clear();
            drawLine(graphics, 0,  bmpd, 0xff0000);
            drawLine(graphics, 25, bmpd, 0x00ffff);
            drawLine(graphics, 50, bmpd, 0x00ff00);
            drawLine(graphics, 75, bmpd, 0x0000ff);
            drawLine(graphics, 99, bmpd, 0xffff00);
        }
        
        // 曲線を描く関数
        private function drawLine(g:Graphics, y:Number, source:BitmapData, color:uint):void
        {
            g.lineStyle(1, color);
            for(var i:int=0 ; i<500 ; i+=20)
            {
                if(i==0) g.moveTo(i, (source.getPixel(i,y)>>16)*1.5);
                else g.lineTo(i,(source.getPixel(i,y)>>16)*1.5);
            }
            g.endFill();
        }
    }
}

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