I conclude my review of scripts you'll need for programming your Flash games with a discussion of timers. When designing Flash games, it's often necessary to set up timers or clocks or other time-limited activities. In ActionScript 3.0, the timer class is the interface to your timers. This class lets you execute any code repeatedly over a specific time intervals or you can use it to run code on a specified time sequence. This is an extensive class which offers much more functionality than the older set-interval method that was used in ActionScript 2.0. You'll use the Start Method to start a timer and then add an event listener for the timer event. You'll then set up code to be run on the timer interval. So to use this timer class, create an instance of the timer class which I'm doing right here, variable my identifier colon timer equals new timer. Notice that the new timer method takes two parameters; the delay in seconds and the number of times you're repeating the timer. You'll then listen to the TimerEvent.timer using the addEventListener Method. So I'm setting up an add event listener for the TimerEvent.timer and I'm running this timer listener function. Then create your event listener function to execute the code you wish to run either repeatedly or on the timer. In other words, after a certain amount of time is elapsed, then run this function; function timer listeners. There's that e colon timer event colon void. Don't forget the curly braces and then your commands will go down here for the function. Then you'll start your timer using the .start method. We've seen that before for starting our audio playback for our sound objects. Remember, that took two parameters; one for the delay and again one for how many times you're repeating. So it's very similar, that start method, whether you're starting a timer or starting your audio playback. And you can also perform a lot of useful work with the Get Timer Function. This function returns the number of milliseconds that have elapsed since the Flash move started playing. It can also compare the Get Timer value at one instant with the Get Timer value at another instant to get the elapsed time between the two instants. Use this elapsed time to create timers for games and activities. You can use this technique to time how long a player has been at a certain level or mode or how long they've taken to answer a question or complete a test or even award more points the longer a player survives a shootout or some other activity or challenge. Go ahead and open the Timer.fla file in the Work Files folder for an example of the script using this Get Timer Function. In this case do a Control Test Movie. You can see that I'm checking to see how long the time has elapsed since the move started or since the last time I clicked on the mouse; one second, two second, three second, then it starts over again. So to set up this script, first you'll create a dynamic text field on your stage, give it an instance name here. I've labeled it Timer underscore Text. I also added some labels here; click mouse button to reset time elapsed. Click on the first frame of the timeline, open up the Actions Panel. We start by declaring a number variable named Start Time and then we assign it an initial time of zero right here. You can easily set up levels in your games by putting a different initial value here. For example, to give the player less time to accomplish the task, you could set the initial value to five or six or ten or twenty and then when 30 seconds or so has elapsed, the game then ends. In a new line set up an event handler assigned to the stage to detect when any mouse click is made anywhere on the stage; Stage.addeventlistener mouse event click. You can also change that to a double click or to a mouse over or mouse out. Then I'm running the reset function when that event has been detected. Here is my function reset call down here. Inside this Mouse.click event handler function, enter start time followed by equal sign and then the function Get Timer, open close parenth semicolon. Right there, that's the active method that we're using for this time in this example. This establishes that whenever the mouse button is clicked, Flash will put the elapsed time since the move started in this start time variable. That's why we're setting it to zero to begin with. Close out the function with the closing curly brace and then on a new line add another event handler to detect the ENTER frame event right there; ENTER all in uppercase letters, underscore between the ENTER and the frame. When that event has been detected, notice that's also attached to the stage there. So this runs all the time. When the enter event has been detected, which is always, run the show time function, set up your function, function show time, my event colon event void, open curly brace. Now within the enter frame event handler function, declare another variable. This one is called current time right here, variable current time colon. I'm setting that to a number equals get timer. What this will accomplish is that Flash has been told to continuously get the time that has elapsed since the movie started and put it in this current time variable right there. So the get timer gets a value from Flash. It is when the movie first started. Now, on the next line but still in the function, declare yet another variable. This one's called elapsed time. It's going to be a number and you're going to set it equal to the current time minus the start time divided by 1,000. What this does is calculate the difference between the current timer and the start timer. The instant the mouse was clicked. So every time the mouse is clicked, it calculates the difference. We divide by 1,000 to convert it from milliseconds to simple seconds, much easier to read. And then on a new line down here we convert the elapsed time value to a string and put it into my dynamic text field. Remember, it's labeled Timer underscore txt. Close off the function with a curly brace and now test the move. Control Test Movie; make sure you're not getting any errors, nothing in the output panel and the time elapsed should just run. Remember, that's in that event listener on enter frame so it continuously runs and then each time I click on the mouse button, I resetting the time so it's measuring the time that has elapsed since I last clicked on the mouse. Experiment with different event handlers to create times when different events or different situations occur such as when collisions are detected or keyframes or entered or perhaps you can set up a timer when movie clips are first loaded into the game. We now have all the basic components to create simple but highly-entertaining Flash games, quizzes, puzzles and other user interactions. But let me now move on to the next movie and give you some ideas and techniques for using and combining the scripts I've reviewed here to create more interesting and playable Flash games.
|Course:||Adobe Flash ActionScript 3.0 for Designers|
|Duration:||9.5 hrs / 101 lessons|
|Captions:||Available on CD and Online University|
WIN XP SP3, OS X 6+, Android 4, iOS 4, Linux
TERMS & CONDITIONS OF USE
BY SUBSCRIBING TO THIS SERVICE, YOU ARE CONSENTING TO BE BOUND BY AND ARE BECOMING A PARTY TO THIS AGREEMENT, THE TERMS AND CONDITIONS OF WHICH SHALL PREVAIL IN GOVERNING YOUR RIGHTS OF USE. BY CLICKING THE "BECOME A MEMBER" BUTTON, THE INDIVIDUAL OR ENTITY LICENSING THE PRODUCT ("YOU") IS CONSENTING TO BE BOUND BY AND IS BECOMING A PARTY TO THIS AGREEMENT. IF LICENSEE DOES NOT AGREE TO ALL OF THE TERMS OF THIS AGREEMENT, THE BUTTON INDICATING "BECOME A MEMBER" MUST NOT BE SELECTED, AND LICENSEE MUST NOT INSTALL OR USE THE SOFTWARE.
"VTC" refers to Virtual Training Company,
"You" refers to the user or subscriber.
"Software" refers to the VTC training content and software.
2. LICENSE: VTC hereby grants to You a worldwide, non-royalty bearing, non-exclusive license to use the Software according to the provisions contained herein and subject to payment of the applicable subscription fees.
3. RESTRICTIONS: You may not do any of the following:
Save the Software to Your hard disk or other storage
medium; permit others to use the Software except as specified by addendum;
modify, reverse engineer, decompile, or disassemble the Software; make
derivative works based on the Software; publish or otherwise disseminate
the Software. VTC, Inc., VTC Online University, and the Virtual Training
Company site is owned and operated by VTC, Inc. as a corporation of
All materials on this site are the property of VTC unless otherwise specified. No material from these pages may be copied, reproduced, republished, downloaded, uploaded, posted, transmitted, or distributed in any way. Modification of the materials or use of the materials for any other purpose is a violation of U.S. copyright law and other proprietary rights. For purposes of this Agreement, the use of any such material on any other web site or networked computer environment is prohibited.
4. FEES: The rights granted under this Agreement
are effective only upon payment of the subscription fees, which are
strictly non-refundable other than as expressly provided herein. The
term "monthly subscription" is defined as any 30 day period.
The term "yearly subscription" is defined as one 365 day
period. A yearly subscription ends on the same numerical date as it
began (example July 28, 2004 to July 28, 2005).
The VTC Online University is access to every VTC training tutorial in our library. You pay a flat fee for access to these titles. You are billed according to your renewal selection below, and can renew monthly, yearly, or in any other increment offered. If you choose to be billed monthly, you will be billed every 30 days for the subscription until you request the subscription be cancelled. Our terms of service state that you must cancel a monthly subscription at least two business days before your renewal date. These two days give us enough time to ensure that you will not be charged again.
5. LIMITED WARRANTY: VTC warrants that the Software, if operated as directed, will substantially achieve the functionality described. VTC does not warrant, however, that Your use of the Software will be uninterrupted or that the operation of the Software will be error-free or secure. In addition, the security mechanisms implemented by the Software have inherent limitations, and You must determine that the Software sufficiently meets Your requirements. VTC also warrants that the media containing the Software, if provided by VTC, is free from defects in material from the date You acquired the Software. VTC's sole liability for any breach of this warranty shall be, in VTC's sole discretion: (i) to replace Your defective media or Software; or (ii) to advise You how to achieve substantially the same functionality with the Software as described; or (iii) if the above remedies are impracticable, to refund the subscription fee You paid for the Software. Only if You inform VTC of Your problem with the Software during the applicable subscription period will VTC be obligated to honor this warranty. VTC will use reasonable commercial efforts to repair, replace, advise, or refund pursuant to the foregoing warranty within thirty (30) days of being so notified. If any modifications are made to the Software by You during the warranty period; if the medium is subjected to accident, abuse, or improper use; or if You violate the terms of this Agreement, then this warranty shall immediately terminate. This warranty shall not apply if the Software is used on or in conjunction with hardware or software other than the unmodified version of hardware and software with which the Software was designed to be used as described.
THIS IS A LIMITED WARRANTY, AND IT IS THE ONLY WARRANTY MADE BY VTC OR ITS SUPPLIERS. VTC MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT OF THIRD PARTIES' RIGHTS. YOU MAY HAVE OTHER STATUTORY RIGHTS. HOWEVER, TO THE FULL EXTENT PERMITTED BY LAW, THE DURATION OF STATUTORILY REQUIRED WARRANTIES, IF ANY, SHALL BE LIMITED TO THE ABOVE LIMITED WARRANTY PERIOD. MOREOVER, IN NO EVENT WILL WARRANTIES PROVIDED BY LAW, IF ANY, APPLY UNLESS THEY ARE REQUIRED TO APPLY BY STATUTE NOTWITHSTANDING THEIR EXCLUSION BY CONTRACT. NO DEALER, AGENT, OR EMPLOYEE OF VTC IS AUTHORIZED TO MAKE ANY MODIFICATIONS, EXTENSIONS, OR ADDITIONS TO THIS LIMITED WARRANTY.
6. PROPRIETARY RIGHTS: VTC reserves all proprietary rights in and to the Software, is protected by copyright and other intellectual property laws and by international treaties. VTC, Inc.
Trademark Notice: VTC, Virtual Training Company,
Inc., The VTC Logo, and VTC Online University, are trademarks of VTC,
Inc. All other company and product names may be trademarks of their
The information contained herein is subject to change without notice. Copyright © 1995 - 2005 VTC, Inc. All rights reserved.
7. TERMINATION: This Agreement shall automatically terminate if You fail to comply with the restrictions described herein. Your obligations to pay outstanding subscription fees shall survive any termination of this Agreement.
8. LIMITATION OF LIABILITY: UNDER NO CIRCUMSTANCES
AND UNDER NO LEGAL THEORY, TORT, CONTRACT, OR OTHERWISE, SHALL VTC
OR ITS SUPPLIERS OR RESELLERS BE LIABLE TO YOU OR ANY OTHER PERSON
FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF
ANY CHARACTER, INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF GOODWILL,
WORK STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL OTHER
COMMERCIAL DAMAGES OR LOSSES. IN NO EVENT WILL VTC BE LIABLE FOR ANY
DAMAGES IN EXCESS OF THE AMOUNT VTC RECEIVED FROM YOU FOR A LICENSE
TO THE SOFTWARE, EVEN IF VTC SHALL HAVE BEEN INFORMED OF THE POSSIBILITY
DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY. THIS LIMITATION OF LIABILITY SHALL NOT APPLY TO LIABILITY FOR DEATH OR PERSONAL INJURY RESULTING FROM VTC'S NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH LIMITATION. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THIS EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU.
9. Links To Other Materials: Linked sites found at the VTC site are not under the control of VTC, and we are not responsible for the content of any linked site or any link contained in a linked site. VTC may change links based solely on our discretion, and we reserve the right to terminate any link or linking program at any time. VTC does not, by linking to sites, endorse companies or products to which it links and reserves the right to note as such on its web pages. If you decide to access any of the third party sites linked to this site, you do this entirely at your own risk.
Forums, and Chat are not always screened by VTC, and we are not responsible for the content of any public or open forum content at the site. VTC may change these public forums based solely on our discretion, and we reserve the right to terminate any forum at any time. VTC does not, by allowing these forums, endorse companies or products which may be mentioned in these forums, and reserves the right to note as such on its web pages. If you decide to access any of the public forums in this site, or linked to this site, you do this entirely at your own risk.
9. GOVERNING LAW & DISPUTE RESOLUTION: This Agreement is governed by Virginia law. All disputes between You and VTC shall be finally resolved through arbitration in Winchester, Virginia. This site is controlled by VTC from its offices within the United States of America. VTC makes no representation that materials in the site are appropriate or available for use in other locations, and access to them from territories where their content is illegal is prohibited. Those who choose to access this site from other locations do so on their own initiative and are responsible for compliance with applicable local laws. You may not use or export the Materials in violation of U.S. export laws and regulations. Any claim relating to the Materials shall be governed by the internal substantive laws of the Commonwealth of Virginia, USA.
VTC may revise these Terms at any time by updating this posting. You should visit this page from time to time to review the then-current Terms because they are binding on you. Certain provisions of these Terms may be superseded by expressly designated legal notices or terms located on particular pages at this Site.
If you have any questions regarding this policy,
or your information specifically,
you may email us at:firstname.lastname@example.org.