package {
import flash.display.*;
import flash.events.*;
import flash.geom.*;
import flash.utils.*;
import com.flashdynamix.utils.*;
[SWF(frameRate=60)]
public class FlashTest extends Sprite {
public var particles :Vector.<Particle> = new Vector.<Particle>;
public var pNext:Particle;
public var canvas:BitmapData;
public var forceMap:BitmapData;
public var forceX:Vector.<Number> = new Vector.<Number>();
public var forceY:Vector.<Number> = new Vector.<Number>();
public function FlashTest() {
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
stage.addEventListener(MouseEvent.CLICK, onClick);
W = stage.stageWidth;
H = stage.stageHeight;
mW = W>>1;
mH = H>>1;
canvas = new BitmapData( W, H, false, 0x00 );
addChild( new Bitmap(canvas) );
var length:int = 25000;
var p:Particle, sx:Number, sy:Number;
while( length-->0 ) {
sx = Math.random() *W;
sy = Math.random() *H;
p = new Particle( sx , sy );
p.next = pNext;
pNext = p;
particles .push( p );
}
forceMap = new BitmapData( mW, mH, false );
changeForce();
changeSpeed();
var forceTimer:Timer= new Timer( 4000 );
forceTimer.addEventListener( TimerEvent.TIMER, onTimerForce );
forceTimer.start();
var timer:Timer= new Timer( 3000 );
timer.addEventListener( TimerEvent.TIMER, onTimerSpeed );
timer.start();
addEventListener( Event.ENTER_FRAME, update );
SWFProfiler.init( this );
}
public function onClick( e:Event ):void {
changeForce();
}
public function onTimerForce ( e:Event ):void {
changeForce();
}
public function onTimerSpeed ( e:Event ):void {
changeSpeed();
}
public function changeSpeed():void{
speed = Math.random()* 0.1 + 0.003;
colorTr.redOffset = Math.random()*40-20;
colorTr.greenOffset = Math.random()*10-5;
colorTr.blueOffset = Math.random()*10-5;
}
public function changeForce():void {
var seed:Number = Math.random() * 0xFF;
forceMap .perlinNoise(128, 128, 12, seed, false, true, channels, false );
for( var iy:int =0; iy<mH; ++iy ) {
for( var ix:int =0; ix<mW; ++ix ) {
var c:uint = forceMap.getPixel( ix, iy );
var pos:int = iy*mW+ix;
forceX[ pos ] = (c>>8&0xff)-128;
forceY[ pos ] = (c>>0&0xff)-128;
}
}
}
public var W:Number;
public var H:Number;
public var speed:Number = 0.005;
public var drawColor:uint = 0x999933;
public var channels:uint = BitmapDataChannel.GREEN | BitmapDataChannel.BLUE;
public var mW:int;
public var mH:int;
public const colorTr:ColorTransform = new ColorTransform(1, 1, 1, 1, 2, 2, 3);
public const OP:Point = new Point;
public function update(e:Event):void {
var i:int, c:uint = drawColor, l :Number = mW, w:Number =W, h:Number =H;
var fX:Vector.<Number>=forceX, fY:Vector.<Number>=forceY;
canvas.lock();
canvas.colorTransform(canvas.rect, colorTr);
for each( var p:Particle in particles ) {
i = (p.y>>2) * l + ( p.x>>2 );
p.vx = p.vx*0.86 + fX[i] * p.rad * speed;
p.vy = p.vy*0.86 + fY[i] * p.rad * speed;
p.x += p.vx;
p.y += p.vy;
if ( p.x > w ) p.x -= w;
else if ( p.x < 0 ) p.x += w;
if ( p.y > h ) p.y -= h;
else if ( p.y < 0 ) p.y += h;
canvas.setPixel( p.x>>0, p.y>>0, c );
}
canvas.unlock();
}
}
}
class Particle {
public var x:Number =0;
public var y:Number =0;
public var vx:Number =0;
public var vy:Number =0;
public var rad:Number = Math.random();
public var next:Particle;
public function Particle( x:Number=0,y:Number=0 ){
this.x = x;
this.y = y;
}
}