<< Chapter < Page Chapter >> Page >

The TIMER event handler

The TIMER event handler is shown in Listing 15. Except for the method signature, this is essentially the same code that you saw in the ENTER_FRAME event handler in Listing 4.

The timer event handler.

public function onTimer(event:TimerEvent):void { x += dx;y += dy; }//end onTimer

That's a wrap

I'm going to let that be it for this lesson, which has concentrated on time bases and animation for ActionScript 3 projects.

Run the projects

I encourage you to run these projects from the web. Then copy the code from Listing 16 through Listing 21. Use that code tocreate your own projects. Compile and run the projects. Experiment with the code, making changes, and observing the results of your changes. Makecertain that you can explain why your changes behave as they do.


I will publish a list containing links to ActionScript resources as a separate document. Search for ActionScriptResources in the Connexions search box.

Complete project listings

Complete listings of the projects discussed in this lesson are provided below.

The main class for the project named timebase01.

/*Project TimeBase01 The purpose of this project is to experiment with the useof Event.ENTER_FRAME as a time base. The project computes and displays the average frame rate over five consecutivesets of 200 frames. It also shows how to set the frame rate to something other than the default value.Must be run in debug mode to display the text data. *********************************************************/package { import flash.display.Sprite;import flash.events.Event;public class Main extends Sprite{ private var sprite:Sprite;private var date:Date; private var countA:uint = 0;private var baseTime:Number = 0; private var currentTime:Number = 0;public function Main():void {sprite = new Sprite(); addEventListener(Event.ENTER_FRAME, onEnterFrame);// stage.frameRate = 10; }//end constructor//--------------------------------------------------////Event handler. public function onEnterFrame(event:Event):void {currentTime = new Date().time; if (countA == 0) {baseTime = currentTime; trace(baseTime);}//end ifif ((countA>0)&&(countA<1001)&&(countA % 200 == 0)){ trace(currentTime + " " + countA + " "+ 1000 / ((currentTime - baseTime) / 200)); baseTime = currentTime;}//end if countA++;}//end onEnterFrame }//end class}//end package

The main class for the project named timebase02.

/*Project TimeBase02 The purpose of this program is to experiment with the useof a Timer object as a time base. The program computes and displays the average tick rate of the Timer objectover five consecutive sets of 100 frames . It also shows how to set the tick rate to a specific value and how tospecify the number of ticks. *********************************************************/package { import flash.display.Sprite;import flash.events.TimerEvent; import flash.utils.Timer;public class Main extends Sprite{private var sprite:Sprite; private var timer:Timer = new Timer(1000/10,1001);private var date:Date; private var countB:uint = 0;private var baseTime:Number = 0; private var currentTime:Number = 0;public function Main():void {sprite = new Sprite(); timer.addEventListener(TimerEvent.TIMER, onTimer);timer.start();// stage.frameRate = 10; }//end constructor//--------------------------------------------------// //Event handlerpublic function onTimer(event:TimerEvent):void { currentTime = new Date().time;if (countB == 0) { baseTime = currentTime;trace(baseTime); }//end ifif((countB>0)&&(countB<1001)&&(countB % 200 == 0)){trace(currentTime + " " + countB + " " + 1000 / ((currentTime - baseTime) / 200));baseTime = currentTime; }//end ifcountB++; }//end onTimer//--------------------------------------------------// }//end class}//end package

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
I'm not good at math so would you help me
what is the problem that i will help you to self with?
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Object-oriented programming (oop) with actionscript. OpenStax CNX. Jun 04, 2010 Download for free at http://cnx.org/content/col11202/1.19
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with actionscript' conversation and receive update notifications?