forked from: forked from: 飛行機からみた風景っぽく [PerlinNoise]

by Etienne.Verhote 07 Mar 2012

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/**
 * Copyright Etienne.Verhote ( http://wonderfl.net/user/Etienne.Verhote )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/1NRp
 */

// forked from thaiha2t's forked from: 飛行機からみた風景っぽく [PerlinNoise]
// forked from mousepancyo's 飛行機からみた風景っぽく [PerlinNoise]
package  {
    import flash.events.Event;
    import flash.display.Sprite;
    
    [SWF(width="465", height="465", backgroundColor="0", frameRate="30")]
    
    public class Main extends Sprite{
                
       public function Main(){
            var sky:Base = new Base(stage.stageWidth, stage.stageHeight)
            addChild(sky)
            var cloud:PerlinNoiseEx = new PerlinNoiseEx(stage.stageWidth, stage.stageHeight)
            cloud.blendMode = "screen"
            addChild(cloud)
            addEventListener(Event.ENTER_FRAME, cloud.update)
        }
    }
}

//
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.BitmapDataChannel
import flash.events.Event;
import flash.display.Sprite;
import flash.geom.Point
import flash.geom.ColorTransform;
import flash.geom.Rectangle;
import flash.filters.ConvolutionFilter;
import flash.geom.Matrix;

class PerlinNoiseEx extends Sprite{
    
    private var _bmd:BitmapData
    private var _oct:int
    private var _seed:Number
    private var _channels:uint
    private var _offset:Array = new Array()
    private var _speed:Array = new Array()
    private var _bm:Bitmap
    private var _color:ColorTransform
    
    private var _w:int
    private var _h:int
    
    public function PerlinNoiseEx(w:int, h:int){
        _w = w
        _h = h
        _bmd = new BitmapData(_w, _h, false, 0x99999999);
        _oct = 12
        _seed = Math.floor(Math.random() * 100);
        _seed = 76;
        _channels = BitmapDataChannel.ALPHA | BitmapDataChannel.RED | BitmapDataChannel.BLUE | BitmapDataChannel.GREEN;
        _bm = new Bitmap(_bmd);
        //_bm.blendMode = "add"
        addChild(_bm);
        //
        for(var i:int; i<_oct; i++){
            //_offset[i] = new Point(Math.random()*_w/9, Math.random()*_h/9);
            _offset[i] = new Point(1, 1);
            _speed[i] = new Point(-1, Math.random()*1-0.5);
        }
    }
    
    public function update(e:Event):void{
        for(var i:int; i<_oct; i++){
           // _offset[i].x += _speed[i].x;
            //_offset[i].y += _speed[i].y;
        }
        _bmd.perlinNoise(_w, _h, _oct, _seed, false, false, _channels, false, _offset);
        _bmd.perlinNoise(_w, _h, _oct, _seed, false, false, 9, false, _offset);
        var mat:Array = [0,1,0,
                         1,1,1,
                         0,1,0]
        //_bmd.applyFilter(_bmd, new Rectangle(0,0,465,465),new Point(0,0),new ConvolutionFilter(3,3,mat,3,0))
    }

}

import flash.display.Sprite
class Base extends Sprite{
    public function Base(w:int,h:int):void{
        var colors:Array = [0x000000, 0x000000, 0x000000]
        var alphas:Array = [1, 1, 1]
        var ratios:Array = [50, 127, 245]
        var mat:Matrix = new Matrix()
        mat.rotate(Math.PI / 180 * 90);
        graphics.beginGradientFill("linear", colors, alphas, ratios, mat)
        graphics.drawRect(0,0,w,h)
        graphics.endFill()
    }
}