AS3 Fireflies
A little As3 test based on Andre Michelles experiment here. Performance seems amazing, this is moving 15,000 points each frame and still runs at 40fps in Firefox on my machine! I've had it shifting over 50,000 points without too much slowdown...imagine that in FLash5 ;)
(Flash 8.5 required)
(The source is in the first comment)
(Flash 8.5 required)
(The source is in the first comment)
posted by Adz at 11:40 AM
2 Comments:
Source:
package
{
import flash.util.*;
import flash.display.*;
import flash.events.*;
import flash.geom.*;
import flash.filters.*;
public class PerlinForce extends Sprite
{
private const origin: Point = new Point();
private const w: int = 256;
private const h: int = 256;
private const x1: Matrix = new Matrix( 1, 0, 0, 1, 0, 0 );
private const x2: Matrix = new Matrix( 2, 0, 0, 2, 0, 0 );
//-- fps
private var fpsText: TextField;
private var fr: int;
private var ms: int;
private var force_s: BitmapData;
private var force_b: BitmapData;
private var forceOffsets: Array;
private var points: Array;
private var forceRand: uint;
private var buffer: BitmapData;
private var output: BitmapData;
private var damp: ColorTransform;
private var fxm: Matrix;
public function PerlinForce()
{
init();
fpsText = new TextField();
fpsText.autoSize = 'left';
fpsText.textColor = 0xefefef;
addChild( fpsText );
ms = getTimer();
fr = 0;
}
private function init(): Void
{
output = new BitmapData( w, h, false, 0 );
buffer = new BitmapData( w, h, false, 0 );
var scl: Number = .25;
fxm = new Matrix();
fxm.a = ( w + scl ) / w;
fxm.d = ( h + scl ) / h;
fxm.tx = -scl / 1;
damp = new ColorTransform(1,1,1,1,0,0,0,0 );//1, 1, 1, 1, -2, -2, -2, 0 );
force_s = new BitmapData( 128, 128, false, 0 );
force_b = new BitmapData( w, h, false, 0 );
addChild( new Bitmap( output ) );
points = new Array();
var point: Object;
var i: Number = 1600;
while( --i > -1 )
{
point = { sx: w / 4 + Math.random() * w / 2, sy: h / 4 + Math.random() * h / 2, vx: 0, vy: 0, bounce: 0 };
points.push( point );
}
forceOffsets = [ new Point() ];
forceOffsets.x = Math.random()*2000;
forceOffsets.y = Math.random()*2000;
forceRand = Math.floor(Math.random()*1000);
stage.addEventListener( 'enterFrame', run );
}
private function run( event: Event ): Void
{
forceOffsets[0].x+=2;
forceOffsets[0].y+=(Math.random()*2);
force_s.perlinNoise( 100, 100, 1, forceRand, true, true, 6, false, forceOffsets );
force_b.draw( force_s, x2, null, null, null, true );
//blur previous
var bf:BlurFilter = new BlurFilter(2,2,1);
buffer.applyFilter(buffer,buffer.rectangle, origin, bf);
//-- move points with respect to force
var point: Object;
var sx: Number;
var sy: Number;
var vx: Number;
var vy: Number;
var c: int;
var i: Number = points.length;
while( --i > -1 )
{
point = points[i];
sx = point.sx;
sy = point.sy;
vx = point.vx;
vy = point.vy;
c = force_b.getPixel( sx | 0, sy | 0 );
vx += ( ( ( c >> 8 ) & 0xff ) - 0x80 ) / 256;
vy += ( ( c & 0xff ) - 0x70 ) / 256;
vx *= .9;
vy *= .9;
sx += vx;
sy += vy;
if (point.bounce++>3) {
//simple wrap
point.bounce = 0;
if (sx<0) sx += w;
if (sx>w) sx -= w;
if (sy<0) sy += h;
if (sy>h) sy -= h;
}
else {
//bounce
if( sx < 0 )
{
sx = 0;
vx *= -( Math.random() * 10 );
}
if( sx > w )
{
sx = w;
vx *= -( Math.random() * 10 );
}
if( sy < 0 )
{
sy = 0;
vy *= -( Math.random() * 10 );
}
if( sy > h )
{
sy = h;
vy *= -( Math.random() * 10 );
}
}
point.sx = sx;
point.sy = sy;
point.vx = vx;
point.vy = vy;
buffer.setPixel( sx | 0, sy | 0, 0xffffff - c + (Math.floor(vx*vy)<<4) );
}
buffer.draw( buffer, fxm, damp, BlendMode.DARKEN, null, true );
output.copyPixels( buffer, buffer.rectangle, origin );
//-- fps
fr++;
if( ms + 1000 < getTimer() )
{
fpsText.text = fr.toString();
fr = 0;
ms = getTimer();
}
}
}
}
this code is broken- it throws a bunch of errors when I compile it.
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