ぱーてぃくる花火
package {
import flash.display.Sprite;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.PixelSnapping;
import flash.filters.*;
import flash.geom.Point;
import flash.events.Event;
[SWF(width="465", height="465", backgroundColor="0x000000", frameRate="60")]
public class Rain extends Sprite{
private var stg:Sprite=new Sprite();
private var bmpData:BitmapData=new BitmapData(465,465,true,0x00000000);
private var stgBmp:Bitmap=new Bitmap(bmpData,PixelSnapping.AUTO,true);
private var obj:Array;
private var n:uint=2047;
private var counter:uint=0;
private var index:Array;
private var onum:uint=0;
private var filterObj:BlurFilter;
private var r:int;
private var g:int;
private var b:int;
private var angle:Number;
public function Rain(){
obj=new Array(n)
for(var i:uint=0;i<n;i++){
obj[i]=new Array(5);
}
index=[0,0];
addChild(stg);
stg.addChild(stgBmp);
stg.addEventListener("enterFrame", loop);
filterObj=new BlurFilter();
with(filterObj){
blurX=2;
blurY=2;
quality=2;
}
r=Math.floor(Math.random()*256);
g=Math.floor(Math.random()*256);
b=Math.floor(Math.random()*256);
}
private function loop(e:Event):void{
bmpData.applyFilter(bmpData,bmpData.rect, new Point(0, 0),filterObj);
for(var i:uint=0;i<31;i++){
onum=counter%n;
obj[onum][0]=mouseX;
obj[onum][1]=mouseY;
angle=Math.random()*360;
obj[onum][2]=Math.cos(angle/180*Math.PI)*Math.random()*5;
obj[onum][3]=Math.sin(angle/180*Math.PI)*Math.random()*5;
obj[onum][4]=(r<<16)|(g<<8)|b;
index[1]=counter;
counter++;
}
r+=Math.floor(Math.random()*9)-4;
g+=Math.floor(Math.random()*9)-4;
b+=Math.floor(Math.random()*9)-4;
if(r>255){r=255;}else if(r<0){r=0;}
if(g>255){g=255;}else if(g<0){g=0;}
if(b>255){b=255;}else if(b<0){b=0;}
for(i=index[0];i<=index[1];i++){
onum=i%n;
obj[onum][0]+=obj[onum][2];
obj[onum][1]+=obj[onum][3];
obj[onum][2]*=0.95;
obj[onum][3]*=0.95;
bmpData.setPixel32(obj[onum][0],obj[onum][1],0xff000000|obj[onum][4]);
}
}
}
}