Now that you can move and control an object around the stage, you will probably now want to detect when these objects collide or intersect with other objects. Go ahead and open up the Detect underscore Collision file, Control Test Movie and notice that this script is also working here for controlling our spaceship, the angle and the direction it moves but notice that I have now a collision script that detects when these two objects on the stage collide with each other. So I did this using two methods or I can do this using two methods of the display object class. Hit Test Object or hit Test Point. The Hit Test Object method enables you to test whether the bounding box of any two objects intersect. Remember, the bounding box of an object is the minimum rectangular area that contains the graphics of that object. This is the best method for our games where graphics are colliding with other graphics on the stage, such as the ladybug game that I showed you earlier where the ladybugs were running over the spiders or the hearts. You can also use one of these methods to determine when a user lets go or drops an object that they're moving with their mouse. In this example we're testing to see if the spaceship movie clip is currently intersecting with the asteroid movie clip. You can see the script here in the Detect Collision File right here. If SpaceshipMovieClip.hittestobjectasteroidmovieclip equals true, then do some things. Now, the second method that we can also use checks whether a certain XY coordinate intersects with an object. This method can be seen here in the DetectCollision underscore Point File. Let's open that and notice that here I'm using the SpaceshipMovieClip.hittesstpointasteroidmovieclip and I have an X and Y coordinate here. In other words, it's checking to see if the X and Y coordinates of the asteroid movie clip have intersected with the spaceship movie clip. So this method is point specific and you want to make this your choice for checking whether the registration point of a graphic or the mouse pointer intersects with another object. If we do a Control Test Movie, you'll see the difference. I think this one actually works better in our case here because the spaceship actually collides with the asteroid before I get the animation of the explosion. Compare that to the detect collision. They're slightly different but you'll notice that with the detect collision, as soon as the bounding box of the movie clip hits the bounding box of the asteroid, I get the explosion which is a little bit premature for this version here. More about the script here in the ObjectCollison underscore Point file using the Hit Test Point method a little bit later. But for now, let's go back to the Object underscore Collision file and let me review the active scripts here. All I'm actually doing is adding the collision to the end of my object move file. So I reviewed these scripts in the previous movie. Go ahead and add on the stage another object, an asteroid object. I have an animation for mine but you can actually choose just a static object, convert it to a movie clip, give it an instance name. In this case I'm calling it Asteroid underscore Movie Clip. Now what you want to do is add an enter frame event listener to the stage. This will continuously check for this hit test object method. Add a function to run when that event is detected. In between the curly braces of the enter frame function, write a conditional that includes the instance name of the spaceship movie clip, which is Object 1, followed by the Hit Test Object method and then the name of the second object; in this case, my asteroid movie clip. Notice that those, the asteroid movie clip is in parentheses and write two equal signs and then true. In other words, if it's true that the spaceship movie clip has overlapped or intersected with the asteroid movie clip, then go down to the next line. Now here what I'm doing is I'm moving the spaceship movie clip to the next frame. That's going to be an empty frame so the spaceship disappears and I'm also moving the timeline, the asteroid timeline to Frame 80 and I'm stopping that. So let's have a look at these two movie clips. First the spaceship. Notice that here in Frame 2, the spaceship disappears. Double click on the asteroid. The asteroid consists of an animation. This thing is then spinning and then Frame 80 is the explosion right here. Obviously I probably would want to clean this up and have an animation of an explosion; maybe a sound effect and then maybe the explosion grows and then disappears as well, making that animation look more realistic. But you get the idea that I'm just simply controlling these two timelines of the movie clips to show the graphics that I want when the collision has been detected. Now, after you check that your script is written exactly like mine here, don't forget the curly braces. Also remember, I'm adding this script to the end of my object move script. So I tested that in the previous movie. Made sure it was working. You want to do the same, then add your collision detection script. Make sure it looks just like mine and then do a Control Test Movie, make sure you get no errors, nothing in the output panel. Collide your two objects, make sure that the play head is moving to Frame 80 of the asteroid showing the explosion. It's moving to Frame 2 of the spaceship movie clip, which is empty so the spaceship disappears. You could also have an explosion of the spaceship perhaps there in Frame 2, animation. Now, you can also replace the Hit Test Object Method with the Hit Test Point Method. Have a look at the detect collision point file for this one. Notice that everything's the same except for this line right here. I'm replacing the Hit Test Object with the Hit Test Point. Here I've set up my coordinates for my asteroid, the X and Y registration points and then I've added one more parameter; this false parameter is the shape flag parameter. This indicates whether Flash should use the bounding box of the object, which is false, or the shape of the graphics in the object in deciding if the point is in contact with the object. Go ahead and choose false first and then do a Test Movie. This is going to look very similar to the other file. As soon as I cross over the X and Y registration point of that asteroid, I get a collision. If I set this to true, I think this probably looks the best. Now I'm ignoring the bounding box and I'm actually using the shape of the graphic, the asteroid graphic. This probably looks the best of my options here. Notice that the spaceship really collides with that asteroid right there before it explodes. Maybe too late. The other one is probably too early. So there you have two methods for detecting collisions between objects that are moving on your stage; Hit Test Point and Hit Test Object. Let's now move on to the next movie and review scripts for creating timers and clocks.
|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.