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Actionscript 3.0 - LEVEL INTERMEDIATE
AS3 Random Fly Insect Behaviour	Last edited 14TH DEC, 2010
Attach a movieclip in your Flash IDE library to this script, making sure you have the greensock tweening library classes present in your application structure. It will buzz around and fly in completely random paths. Play around with the stage bounds and easing to tweak it to suit. You could also make your insect perform an action in between where it stops and flies off again.

package
 {
 
 import flash.display.*;
 import flash.utils.*;
 import flash.events.*;
 
 // TweenLite goodness
 import com.greensock.*;
 import com.greensock.easing.*;
 import com.greensock.plugins.TweenPlugin; 
 import com.greensock.plugins.BezierPlugin; 
 TweenPlugin.activate([BezierPlugin]); //activation is permanent in the SWF, so this line only needs to be run once.
 
 public class Fly extends MovieClip
 {
 
 private var myTimeout:uint;
 private var startX:Number;
 private var startY:Number;
 private var boundsLeft:Number = 20;
 private var boundsRight:Number = 940;
 private var boundsTop:Number = 20;
 private var boundsBottom:Number = 580;
 
 public function Fly ()
 {
 
 
 startX = this.x;
 startY = this.y;
 
 this.cacheAsBitmap = true;
 
 addEventListener(Event.ADDED_TO_STAGE, attached);
 
 buzzOff();
 
 
 }
 
 public function attached ( e:Event ) : void
 {
 
 //trace("Hi I'm a Fly");
 
 }
 
 public function buzzOff () : void
 {
 
 // Final position
 var newX:int = getRandomX();
 var newY:int = getRandomY();
 
 
 // Bezier step points
 var bx1:int = getRandomX();
 var by1:int = getRandomY();
 
 var bx2:int = getRandomX();
 var by2:int = getRandomY();
 
 var bx3:int = getRandomX();
 var by3:int = getRandomY();
 
 TweenLite.to(this, 2 + Math.random() * 1, {bezier:[{x:bx1, y:by1}, {x:bx2, y:by2}, {x:bx3, y:by3}, {x:newX, y:newY}], ease:Sine.easeInOut, onComplete:buzz});
 
 
 }
 
 public function getRandomX () : int
 {
 
 return Math.round(boundsLeft + ((boundsRight - boundsLeft) * Math.random()));
 
 }
 
 public function getRandomY () : int
 {
 
 return Math.round(boundsTop + ((boundsBottom - boundsTop) * Math.random()));
 
 }
 
 public function buzz() : void
 {
 
 startX = this.x;
 startY = this.y;
 
 this.gotoAndPlay(2);
 
 setTimeout(buzzOff, 250 + (Math.random() * 250));
 
 }
 
 public function kill() : void
 {
 
 clearTimeout(myTimeout);
 
 }
 
 
 }
 
 }