[sourcecode language=”java”]
package
{
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
public class MultiSpring extends Sprite
{
private var ball:Ball;
private var handles:Array;
private var spring:Number = 0.1;
private var friction:Number = 0.8;
private var numHandles:Number = 3;
public function MultiSpring()
{
init();
}
private function init():void
{
ball = new Ball(20);
addChild(ball);
handles = new Array();
for(var i:uint = 0; i < numHandles; i++)
{
var handle:Ball = new Ball(10, 0x0000ff);
handle.x = Math.random() * stage.stageWidth;
handle.y = Math.random() * stage.stageHeight;
handle.addEventListener(MouseEvent.MOUSE_DOWN, onPress);
addChild(handle);
handles.push(handle);
}
addEventListener(Event.ENTER_FRAME, onEnterFrame);
addEventListener(MouseEvent.MOUSE_UP, onRelease);
}
private function onEnterFrame(event:Event):void
{
for(var i:uint = 0; i < numHandles; i++)
{
var handle:Ball = handles[i] as Ball;
var dx:Number = handle.x – ball.x;
var dy:Number = handle.y – ball.y;
ball.vx += dx * spring;
ball.vy += dy * spring;
}
ball.vx *= friction;
ball.vy *= friction;
ball.x += ball.vx;
ball.y += ball.vy;
graphics.clear();
graphics.lineStyle(1);
for(i = 0; i < numHandles; i++)
{
graphics.moveTo(ball.x, ball.y);
graphics.lineTo(handles[i].x, handles[i].y);
}
}
private function onPress(event:MouseEvent):void
{
event.target.startDrag();
}
private function onRelease(event:MouseEvent):void
{
event.target.stopDrag();
}
}
}
[/sourcecode]