forked from: Explosion(弾幕っぽくしたかった)
// forked from Susisu's Explosion(弾幕っぽくしたかった)
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;
import flash.events.MouseEvent;
import net.hires.debug.Stats;
[SWF(width="512", height="512", backgroundColor="0x000000", frameRate="60")]
public class Rain extends Sprite{
private var stg:Sprite=new Sprite();
private var bmpData:BitmapData=new BitmapData(512,512,true,0xff000000);
private var stgBmp:Bitmap=new Bitmap(bmpData,PixelSnapping.AUTO,true);
private var obj:Array;
private var n:int=2000;
private var timer:int=0;
private var index:Array;
private var onum:int=0;
private var filterObj:BlurFilter;
private var spd:Number;
public function Rain(){
obj=new Array(n)
for(var i:uint=0;i<n;i++){
obj[i]=new Array(4);
}
index=[0,0];
addChild(stg);
stg.addChild(stgBmp);
stg.addEventListener("enterFrame", loop);
filterObj=new BlurFilter();
with(filterObj){
blurX=2;
blurY=2;
quality=1;
}
spd=2;
addChild(new Stats());
//stg.addEventListener(MouseEvent.MOUSE_DOWN,function(e:Event):void{spd=0.25});
//stg.addEventListener(MouseEvent.MOUSE_UP,function(e:Event):void{spd=2;});
}
private function loop(e:Event):void{
bmpData.applyFilter(bmpData,bmpData.rect, new Point(0, 0),filterObj);
spd=Math.sin(timer/45*Math.PI)*2+2;
for(var i:uint=0;i<5;i++){
onum=index[1]%n;
var r:Number=Math.random()*2*Math.PI;
obj[onum][0]=256;
obj[onum][1]=256;
obj[onum][2]=Math.cos(r)*0.5;
obj[onum][3]=Math.sin(r)*0.5;
index[1]++;
}
for(i=index[0];i<=index[1];i++){
onum=i%n;
obj[onum][0]+=obj[onum][2]*spd;
obj[onum][1]+=obj[onum][3]*spd;
if(Math.abs(obj[onum][0]-256)>256&&Math.abs(obj[onum][1]-256)>256)index[0]++;
else bmpData.setPixel32(obj[onum][0],obj[onum][1],0xff00c0ff|((spd*0xff/4)<<16));
}
timer++;
}
}
}