how to achive the string effects like http://www.bcaa.it/ - actionscript-3

Question

I wanna do a string effect like this website http://www.bcaa.it/
What kind of script or tutorial can I learn from?
Basically I want to achieve same as the website. Have the bouncing string effects, drag the item and move away others item that near it, drag and the sub object follow with easing...

Answer 1

Hey just started coding this up, need something similar for a graph display I'm working on. Here's my start, just two buttons but the idea could be extrapolated/optimized:
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
creationComplete="windowedapplication1_creationCompleteHandler(event)">
<fx:Script>
<![CDATA[
import mx.events.FlexEvent;
private var optimalDistanceUpdateTimer:Timer;
private var optimalDistance:Number = 100;
private var objectUserGrabbed:Button;
private var delayDenominator:Number = 6;
protected function button1_mouseDownHandler(event:MouseEvent):void
{
objectUserGrabbed = event.target as Button;
objectUserGrabbed.startDrag();
}
protected function button1_mouseUpHandler(event:MouseEvent):void
{
objectUserGrabbed.stopDrag();
}
protected function windowedapplication1_creationCompleteHandler(event:FlexEvent):void
{
optimalDistanceUpdateTimer = new Timer(33);
optimalDistanceUpdateTimer.addEventListener(TimerEvent.TIMER, optimalDistanceTickedHandler);
optimalDistanceUpdateTimer.start();
}
private function optimalDistanceTickedHandler(event:TimerEvent):void
{
var targetPoint:Point;
var deltaX:Number;
var deltaY:Number;
if(!objectUserGrabbed)
return;
if(objectUserGrabbed == button1)
{
//Basically here I'm playing of Pythagorean theorem for a 45 degree triangle the x component and the y component are the distance of the hypotenuse over Sqrt(2) for different offsets, radially you'd need to adjust this to compute the target point for each object... would do something like var angleForEach:Number = 360/numObjects; then figure out the target point for each of the objects in a loop var angleForThis = angleForEach*index; (in this example only two objects, no loop needed)
targetPoint = new Point(objectUserGrabbed.x-optimalDistance/Math.SQRT2, objectUserGrabbed.y-optimalDistance/Math.SQRT2);
deltaX = (targetPoint.x-button2.x);
deltaY = (targetPoint.y-button2.y);
button2.move(button2.x+deltaX/delayDenominator, button2.y+deltaY/delayDenominator);
}
else
{
targetPoint = new Point(objectUserGrabbed.x+optimalDistance/Math.SQRT2, objectUserGrabbed.y + optimalDistance/Math.SQRT2);
deltaX = (targetPoint.x-button1.x);
deltaY = (targetPoint.y-button1.y);
button1.move(button1.x+deltaX/delayDenominator, button1.y+deltaY/delayDenominator);
}
lineDrawingArea.graphics.clear();
lineDrawingArea.graphics.lineStyle(1);
lineDrawingArea.graphics.moveTo(button1.x + button1.width/2,button1.y + button1.height/2);
lineDrawingArea.graphics.lineTo(button2.x + button2.width/2,button2.y + button2.height/2);
}
]]>
</fx:Script>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:Group id="lineDrawingArea"/>
<s:Button id="button1" label="Item 1" mouseDown="button1_mouseDownHandler(event)" mouseUp="button1_mouseUpHandler(event)" x="0" y="0"/>
<s:Button id="button2" label="Item 2" mouseDown="button1_mouseDownHandler(event)" mouseUp="button1_mouseUpHandler(event)" x="0" y="0"/>
</s:WindowedApplication>