forked from: flash on 2010-2-7
/**
* Copyright rainafter ( http://wonderfl.net/user/rainafter )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/LsbP
*/
// forked from _ryotaros's flash on 2010-2-7
package {
import flash.display.Sprite;
import flash.events.Event;
public class FlashTest extends Sprite {
public var Particles:Array;
public var ball:Ball;
public var numParticle:int = 15;
public var minDist:Number = 100;
public var spring:Number = 0.005;
public var size:int;
public function FlashTest() {
init();
}
public function init():void{
Particles =[];
for (var i:int = 0; i <numParticle; i++){
Particles.push(new Ball(5));
size = Math.random()* 3 + 2;
Particles[i].scaleY = Particles[i].scaleX = size;
Particles[i].mass = size;
Particles[i].x = Math.random() * stage.stageWidth;
Particles[i].y = Math.random() * stage.stageHeight;
Particles[i].vx = Math.random()* 6 - 3;
Particles[i].vy = Math.random() * 6 - 3;
addChild(Particles[i]);
}
addEventListener(Event.ENTER_FRAME, onenterframe);
}
public function onenterframe(e:Event):void{
for (var i:int = 0;i < numParticle;i++){
var p:Ball = Particles[i];
p.x += p.vx;
p.y += p.vy;
if (p.x >stage.stageWidth + p.width/2){
p.x =0;
} else if (p.x < -p.width){
p.x = stage.stageWidth;
}
if (p.y > stage.stageHeight + p.height/2){
p.y = 0;
} else if (p.y < -p.height) {
p.y = stage.stageHeight;
}
}
for (i = 0; i < numParticle;i++){
var pA:Ball = Particles[i];
for (var j:int = 0;j < numParticle - 1;j++){
var pB:Ball = Particles[j];
Spring(pA,pB);
}
}
graphics.clear();
particleLine();
}
public function Spring(pA:Ball,pB:Ball):void{
var dx:Number = pB.x - pA.x;
var dy:Number = pB.y - pA.y;
var dist:Number = Math.sqrt(dx * dx + dy * dy);
if (dist < minDist){
var ax:Number = dx * spring;
var ay:Number = dy * spring;
pA.vx += ax / pA.mass;
pA.vy += ay / pA.mass;
pB.vx -= ax / pB.mass;
pB.vy -= ay / pB.mass;
}
}
public function particleLine():void{
for (var i:int = 0;i < numParticle -1; i++){
graphics.lineStyle(1,0xaaaaaa);
graphics.lineTo(Particles[i].x, Particles[i].y);
graphics.moveTo(Particles[i].x, Particles[i].y);
}
}
}
}
import flash.display.Sprite;
class Ball extends Sprite {
public var mass:int;
public var vx:Number;
public var vy:Number;
public function Ball (r:Number = 5,color:uint = 0x000000){
graphics.lineStyle(0);
graphics.beginFill(color);
graphics.drawCircle(0,0,r);
graphics.endFill();
}
}