code on 2008-12-17
package {
import flash.display.*;
public class Main extends Sprite {
public function Main() {
for (var i:Number = 5; i-- > 0;) {
addChild(new MotionTail);
}
}
public function remove(child:DisplayObject):void {
removeChild(child);
}
}
}
import flash.display.*;
import flash.geom.Point;
import flash.events.*;
class Babble extends Sprite {
private var cvx:Number;
private var cvy:Number;
private var vx:Number;
private var vy:Number;
private var d:Number;
private var p:Point;
public function Babble(depth:Number) {
d = depth;
p = new Point();
addEventListener(Event.ADDED_TO_STAGE, initialize);
addEventListener(Event.REMOVED_FROM_STAGE, uninitialize);
}
private function initialize(event:Event):void {
var initv:Number = 8;
vx = Math.random() * initv - initv / 2;
vy = Math.random() * initv - initv / 2;
var radius:uint = Math.random() * 20 + 10;
radius /= d;
/*var radius:uint = 10;*/
if (Math.random() * 2 > 1.2)
graphics.beginFill(0xffffff);
else
graphics.beginFill(0x000000);
graphics.drawCircle(-radius / 2, -radius / 2, radius);
graphics.drawCircle(-radius / 2, -radius / 2, radius / 2);
graphics.endFill();
addEventListener(Event.ENTER_FRAME, transitionVector);
addEventListener(Event.ENTER_FRAME, motion);
}
private function transitionVector(event:Event):void {
vx += Math.random() * 2 > 1? (Math.random() * 20) / 50: -(Math.random() * 20) / 50;
vy += Math.random() * 2 > 1? (Math.random() * 20) / 50: -(Math.random() * 20) / 50;
vx /= 1.09;
vy /= 1.09;
}
private function motion(event:Event):void {
x += vx / d;
y += vy / d;
scaleX /= 1.1;
scaleY /= 1.1;
scaleX -= 0.005;
scaleY -= 0.005;
if (width < 1) destroy();
}
public function destroy():void {
removeEventListener(Event.ADDED_TO_STAGE, initialize);
removeEventListener(Event.REMOVED_FROM_STAGE, uninitialize);
removeEventListener(Event.ENTER_FRAME, transitionVector);
removeEventListener(Event.ENTER_FRAME, motion);
var p:Main = parent as Main;
p.remove(this);
}
private function uninitialize(event:Event):void {
}
}
class MotionTail extends Sprite {
private var vx:Number;
private var vy:Number;
private var vs:Number;
private var bx:Number;
private var by:Number;
public function MotionTail() {
addEventListener(Event.ADDED_TO_STAGE, initialize);
addEventListener(Event.REMOVED_FROM_STAGE, uninitialize);
addEventListener(Event.ENTER_FRAME, crusing);
addEventListener(Event.ENTER_FRAME, addBabble);
}
private function initialize(event:Event):void {
vs = Math.random() * 50 + 100;
vx = 0;
vy = 0;
x = Math.random() * stage.stageWidth;
y = Math.random() * stage.stageHeight;
bx = Math.random() * stage.stageWidth;
by = Math.random() * stage.stageHeight;
graphics.beginFill(0x000000);
graphics.drawCircle(0, 0, 2);
graphics.endFill();
}
private function uninitialize(event:Event):void {
removeEventListener(Event.ADDED_TO_STAGE, initialize);
removeEventListener(Event.REMOVED_FROM_STAGE, uninitialize);
removeEventListener(Event.ENTER_FRAME, crusing);
removeEventListener(Event.ENTER_FRAME, addBabble);
}
private function crusing(event:Event):void {
var bs:Number = 5;
bx += Math.random() * 2 > 1? (Math.random() * bs): -(Math.random() * bs);
by += Math.random() * 2 > 1? (Math.random() * bs): -(Math.random() * bs);
if (bx > stage.stageWidth) bx = stage.stageWidth / 2;
if (by > stage.stageWidth) by = stage.stageWidth / 2;
vx += (bx - x) / vs;
vy += (by - y) / vs;
vx /= 1.005;
vy /= 1.005;
x += vx / 1;
y += vy / 1;
}
private function addBabble(event:Event):void {
for (var i:uint = 3; i-- > 0;) {
var babble:Babble = new Babble(1);
babble.x = x;
babble.y = y;
parent.addChild(babble);
}
}
}