第七天堂

按r可以改变流动方式

源代码：

import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.filters.*;
import flash.geom.Point;

const sx:int=stage.stageWidth;
const sy:int=stage.stageHeight;

var tempX:Number,tempY:Number;
var tempX2:Number,tempY2:Number;
var partices:int=6000;
var parPos:Point=new Point(sx/2,sy);
var r:int=40;

var gfx:BitmapData=new BitmapData(sx,sy,false,0x0);
var cover:BitmapData=new BitmapData(sx,sy,true,0x01000000);
addChild(new Bitmap(gfx));
gfx.perlinNoise(Math.random()*100,Math.random()*100,Math.random()*8,Math.random()*8,false,false);

var filter:ColorMatrixFilter=new ColorMatrixFilter([1,0,0,0,-1.8,
             0,1,0,0,-1.9,
             0,0,1,0,-0.1,
             0,0,0,1,0]);

var noiseList:Array=new Array();
for(var i:int=0;i<sx;i++)
{
 noiseList[i]=[];
 for(var j:int=0;j<sy;j++)
  noiseList[i][j]={x:(gfx.getPixel(i,j)-gfx.getPixel(i+1,j))/1000000,y:(gfx.getPixel(i,j)-gfx.getPixel(i,j+1))/1000000};
}

var particeList:Array=new Array();
for(i=0;i<partices;i++)
{
 tempX=Math.cos(Math.random()*Math.PI*2)*Math.random()*r+parPos.x;
    tempY=Math.sin(Math.random()*Math.PI*2)*Math.random()*r+parPos.y;
 particeList[i]={x:tempX,y:tempY,vx:parPos.x-tempX,vy:parPos.y-tempY};
}

gfx.fillRect(gfx.rect,0x000000);

function main():void
{
 for(i=0;i<partices;i++)
 {
  tempX2=Math.floor(particeList[i].x);
  tempY2=Math.floor(particeList[i].y);
  if(tempX2<sx&&tempY2<sy){
      particeList[i].x+=noiseList[tempX2][tempY2].x;
      particeList[i].y+=noiseList[tempX2][tempY2].y;
   particeList[i].y-=0.4+Math.random()*0.9;
   (Math.round(Math.random()*8)<=4) ? particeList[i].x+=Math.random()*0.8 : particeList[i].x-=Math.random()*0.8;
  }
  if(particeList[i].x>sx||particeList[i].y>sy||particeList[i].x<0||particeList[i].y<0){
   particeList[i].x=Math.cos(Math.random()*Math.PI*2)*Math.random()*r+parPos.x;
   particeList[i].y=Math.sin(Math.random()*Math.PI*2)*Math.random()*r+parPos.y;
  }
  gfx.setPixel(particeList[i].x,particeList[i].y,0xE48C0A);
 }
 gfx.applyFilter(gfx,gfx.rect,new Point(0,0),filter);

 setTimeout(main,1);
}
function reportKeyDown(event:KeyboardEvent):void{
    if(String.fromCharCode(event.charCode)=="r")
 {
     gfx.perlinNoise(Math.random()*100,Math.random()*100,Math.random()*8,Math.random()*8,false,false);
  for(var i:int=0;i<sx;i++)
        {
         noiseList[i]=[];
         for(var j:int=0;j<sy;j++)
       noiseList[i][j]={x:(gfx.getPixel(i,j)-gfx.getPixel(i+1,j))/1000000,y:(gfx.getPixel(i,j)-gfx.getPixel(i,j+1))/1000000};
        }

        gfx.fillRect(gfx.rect,0x000000);
 }
}
stage.addEventListener(KeyboardEvent.KEY_DOWN, reportKeyDown);
main();