ActionScript 2.0 :: Avoiding Class Collisions / Overwrites
Dec 30, 2009
I'm working with AS2 and running into a problem when loading a bunch of SWFs that share classes. I have a main SWF that loads several child swfs. The main and the children often share some core classes. The issue is that these SWFs were not all created at the same time, and some of the core classes have changed between SWF compilations. It appears that the first instance of any class to load gets used for all following references to that class - regardless of which version of that class was used in compiling the following SWFs.In AS3, the ApplicationDomain can be set to circumvent this issue, is there any that can be done in AS2 to avoid this collision/overwriting?
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Nov 9, 2004
I have run into this problem twice now, for two different reasons. Technically the more recent time it isn't a roadblock, but rather I just want to avoid memory waste by not using nested functions for my event handlers.[URL]
The reason I've come to this forum is that I always went on my merry way, defining event handler functions on movieclips within functions, until today, I read "I really didn't like the idea of defining an event handling function within a method of a class. I don't think nested functions are a really good practice." in the archives of the BIT-101 blog. So I decided to try to extract these and assign only a reference to each movieclip that needs the function. The problem is, it's in a class - and I need access to the properties of the movieclip from within the function. I figured I might be able to extend MovieClip, but I don't want anything in the library, so I run into the problem of how I would use my new movieclip-extending class - I read something about using the Linkage name of "__Packages."+[classname] - is that really proper? Either way, my final question is - if it's not good practice to use nested functions within the class, where do I create my event handler functions?
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Nov 22, 2010
I'm working on a game (my first) where objects touching is A-Ok, but I want to detect overlapping collisions ahead of time, prevent them, and react. This seems like a pretty basic and common thing, such as a character walking along a platform (even though by touching it it's 'colliding'), but of all the many many collision detection tutorials I've looked at, none of them have covered this case--they all assume that objects touching should be indistinguishable from overlapping. I've been using a workaround of a slightly smaller hitbox to use for collisions, but it has issues of it's own that make it not so good. So basically I'm looking to redo my CD from scratch.
So, like I said, I'd like to know how to differentiate between 'touching' collisions and overlapping collisions, but even a way to keep touching collisions from triggering entirely would work.
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Nov 6, 2002
Action script for Flash MX I made this swf here from the random circle motion tute though slightly adapted, and want to use it as a cursor in another movie. The actual swf is smaller but appears bigger here for some unknown reason.
<hr>
<OBJECT classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000"
codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0"
WIDTH="40" HEIGHT="40" id="swirl" ALIGN="">
[code]....
how do include the first swf in the main one so that it will follow my cursor as it doesnt seem to at the moment. I think that is because the 1st swf overwrites to x/y values in the main one?
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Jun 29, 2011
I have two dynamic text boxes on stage - strap1 and strap2 respectively.Both text boxes use the same font; just different styles. e.g strap1 is Arial regular, strap2 is arial black.In order to get a good anti-alias, I have embeded both fonts. The problem is that the top font overwrites the second. So instead of strap1 being arial normal and strap2 arial black, both textboxes are arial normal.
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Aug 17, 2009
i have a red rectangle. On top of this rectangle is a bitmapped (not vector unfortunately) pattern fill that needs to include some white/transparent pixels that should show the red color of the rectangle. How do you define this in SVG, if possible while avoiding the use of masks? The 'transparent' pixels keep coming up white instead of red.
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Dec 2, 2006
Basically i want an object to avoid/dodge the mouse. But i want the mc to have a fixed x and y to move back to once the mouse is away. I also don't want it to jump, i want it smooth like a follow mouse effect.
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Jun 2, 2011
I love MXML but am starting to notice some of its drawbacks. The main one I'm struggling with is its larger memory usage due to the need for binding. In the super simple code snippet below, which I've tested on Flex 4.0[code]...
My main question: is there any way to set variables in MXML that doesn't eat up memory? I'm aware that I can do this explicitly in AS and keep MXML as a bare bone structure but was wondering if there was an alternative path.
Secondary question: why memory usage in c different from a and b? I've looked up at the intermediate code and it seems like the const case still sets up some binding logic but not as much and have been wondering why that is.
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May 25, 2009
I am working on a project where basically dealing with flv player and videos, am trying to play multiple flv videos of a 3d human character who is speaking out a number like 3550.Here we are using multiple video files and joining them like videos where character says 3 then 1000 then 5 then 50.The issue here is after every video there is a fraction of second where the character is disappearing from the stage which we can't afford because all the numbers have to be played at once to show it as one single digit.I know that this is not a script error but this is how the flv player plays, after one file there will be a delay to play the other.What can I do to achieve my goal and also can how we can download all the required flv files from server to client machine to avoid a streaming delay (All the videos are of 50 to 60 kb files).
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Sep 14, 2010
I have a Flash based game for the browser which sends users' scores to a php backend script which stores the score and the user id in the database.
Now I have a url like www.example.com/update.php?score=200&uid=234
The problem is that this is very much exposed to an intelligent user, and he can use this url to store whatever score he wants in the DB. Also there's no real user authentication, and I don't intend to have one either, because it's really a tiny game.
How can I stop someone from calling the above url and updating his score on his own.
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Feb 4, 2012
I have a problem regarding flash, actionscript3 and movieclips.
I have 2 videos(inserted as movieclips, each one in different frames 100 and 102). I want to gotoAndPlay the one on frame 102, but the other in frame 100 always starts at the same time. How do I play just the specific movieclip of frame 102?
P.S. If I order to reproduce the movieclip on 100, it starts as it should.
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May 18, 2005
I'm working on a website, where in I've swf's embedded into the pages, and now I wanna know Is there any ways to avoid Swf's being downloading to the client system?
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Jul 26, 2011
I'm working on a Flex application that uses MVVM. I understand that it's recommended to have a 1-to-1 mapping between views and view-models. How then do I avoid performing the same calculations and storing the same data multiple times if it is needed in multiple views?
For example, imagine I have a program that can load project files consisting of a list of items. The main tab of my application has an export button that should only be enabled if the project is valid so I create an isExportEnabled property on the view-model for the main tab. The calculation for this involves validating the project by iterating though every item in the project and verifying some attribute on each. I have another tab which has a "Print Project Summary" button so the view-model for this tab has isPrintEnabled. The value for this flag is based on the same criteria, whether or not the project is valid.
I could put the logic for determining these values in their respective view-models, but then I end up calculating the same value twice when a project is loaded. I could move isValid to the domain model but then the model becomes denormalized. What if a saved project is edited without updating the "isValid" flag? I could make a global "Project View-Model" for the entire project which calculates whether the project is valid and then have isExportEnabled and isPrintEnabled delegate to that. However, then I end up with a hierarchy of view-models which this article recommends avoiding: Applying the Presentation Model in Flex
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Jun 20, 2010
is there a way to play sounds one after another avoiding overlapping without using the SOUND_COMPLETE event by SoundChannel? I have a few sounds to be played in order and using SOUND_COMPLETE would take me to add to many listeners.
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Jan 3, 2011
Imagine that you have a lots and lots of the same library item on stage - movieclips - and you want each of them to be clickable. Normally, you would iterate through each of these and register an event listener on MouseEvent.CLICK for each one. It seems to me that if there are large quantities of these items this could be quite inefficient - on memory mostly - to have all these event listeners. I'm trying to figure out if there's a more "central" way to do this, where your main document class just registers once with some kind of central dispatcher using a custom event? Any time ANY of the movieclips are clicked, that fires this custom event and you can just query the event to figure out which clip was clicked.
Each movieclip that is clickable extends an AS class through its linkage, and when clicked, dispatches a custom event. If I'm using the IDE to put a lot of objects on stage, and these objects have linkages to their own custom classes, I don't want to ALSO have to go into the main document class and have it iterate through these objects to register event listeners on each one. I don't really want the document class to have that much knowledge about these objects (loose coupling). I'd rather the objects "communicate" through this mediator and not really worry about knowing more about each other than what you can access through the custom event.
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Jan 26, 2010
I've a line of code for example:
Code:
var l_text:String = class.getXMLObject().getNodeOfName("hello").getText()
but of course if there is no node of name "hello" I get this error.this is part of a massive application and I really don;t want to be adding if statements in everywhere
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Jun 18, 2009
I have shortened this example to keep it simple, otherwise I wouldnt be doint this
I need to pass different variables to function inForLoop each time.
Code:
function someFunction():void {
for (var i:int = 0; i < columns; i++) {
for (var j:int = 0; j < rows; j++) {
[Code]....
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Dec 4, 2010
for example:
var mc:MovieClip=new MovieClip();
mc.graphics.beginFill(0x000000,0.5);
mc.graphics.drawRect(0,0,100,100);
[code].....
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Jan 23, 2009
I am making a game and I cant get my collisions to work. I will give a link to the files because I use external .as files.
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Apr 16, 2010
I am trying to apply code to all instances of the enemy that appear randomly but I've run into problems. Firstly the enemies appear when you press space and the collision doesn't seem to work. I kind of thought you have to push the enemies into an array and hitTest that array right?
Actionscript Code:
stop();
var ship_speed:Number = 10;var lazer_speed:Number = 20;
var enemy_speed:Number = 8;var lazertimer:Number = 0;
var basicenemy:Number = 0;var enemytime:Number = 0; var enID:Number = 0;
var enemies:Array =[]onEnterFrame = function() {
[Code] .....
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Sep 5, 2010
I've been using flash for a long time. I know some stuff, but not enough for what I am trying to do. Basically, I am making a little car minigame of a car in a city. This is my engine on the car:
onClipEvent(load){
speed =0 ;
} onClipEvent (enterFrame) {
if (Key.isDown(Key.UP)) {
speed += 0.4;
} if (Key.isDown(Key.DOWN)) {
speed -= 0.1;
[Code] .....
I am fine with all of it but the collisions, as the car will only bounce when the registration point of the car collides with 'wall', so it looks all funny and that and the car goes into any thing collable half way then bounces back, and occasionally gets stuck in the wall. Reall annoying. Ive tried fixing it but whenever I remove the hittest parts the car wont even move or turn. How to get the wall collides with the car (27.7 x 13) and not the registration. I need a strong engine which works with curves as well, and requires me just putting the code into the car, but if I have to put it into the walls/frame i suppose its okay, but theres no way im going through every single building and that.
Also, it would be cool if:
-An engine where when reversing the steering is reversed (like irl)
-The car doesnt bounce backwards when driving at a wall at an angle, but slides against it (like irl).
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Jan 4, 2011
I'm trying to create a air-hockey game, in flash using AS3.At the moment, I am using an enter frame function to check the positioning of the 3 objects, 2 paddles and a ball, then it checks to see if they are in contact, if they are it then initiates a detect collision function.However it's checking every time the frame is loaded, and at 25 fps, this is quite a lot and the app lags.
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Feb 29, 2004
I'm having a bit of trouble with psuedo 3d collisions using spheres. I'm using _xscale and _yscale to emulate the z-axis (no horizon point), and am having trouble determining the distance between the objects on the z-axis based upon their relative scales.I'm not concerned at this moment with creating new vectors based upon hit angles, just getting the z-index collision detection working. (I also need to tweak the code to prevent trapping, so much todo)Here's the code, the issue is how do I determine the correct value for the z-axis in the hittest?note-this only works when I publish in flash6 when using mx2004, the collision detection doesn't work at all when published for flash7?[code]
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Mar 15, 2007
Is there any faster way to test collisions than hitTest? I remember an example here on kirupa, but I can't find it.
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Aug 14, 2008
I can sorted Vertical and Horizontal collision. But I'm having trouble with collisions at an angle, e.g. a 45 degree ramp. My cousin says I have to work out the trajectory angle from the Xv and Yv but the closest I can get is:PHP Code:
[Code]...
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Feb 9, 2009
I've been experimenting with circle vs. circle collisons. Ive been using the code below to check for collisions and seperate the objects.It works just fine, except in conditions where more than two circles are touching at the same time. For example, if three circles or more are colliding at the same time, they can sometimes overlap and then struggle to separate.
I think I know why this is happening. The code loops through the object array and checks for a collision between each object one at a time and alters their positions and velocities. The problem is that if it finds a collision between objects at the end of the array, the positions of the objects could be changed in such a way that they cause an overlap with an object that was checked earlier, for which no collision was detected. This new collision then goes undetected and this flaw is amplified when the loop runs again.
Code:
function circleCollision(circleOne:MovieClip, circleTwo:MovieClip):void
{
//Find radius, x and y positions of circleOne
var circleOne_Radius = circleOne.width/2;
var circleOne_X = circleOne.x;
[code]....
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Mar 20, 2011
Im trying to make a breakout clone which I have working however I cant figure out how to test which side of the blocks the ball hits. I woul like to have a different reaction if it collides with the right side than if it hit the bottom etc.
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Apr 17, 2009
I know you use the HitTest function to check for collisions, but how would I do that the moment a movie clip is dynamically created. So the moment the clip is created it would check if it is overlapping another clip. Also, does it matter if the clips are at different depths?
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May 3, 2010
I would like to avoid the tags overlapping each other in this small Flex project: I've this small FLEX project: [URL]..
The items are LinkButtons. How can I check if they are colliding or not ?
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Feb 13, 2012
I'm new to flash and programming in general but am learning it to make games. I'm currently messing around with hit detection and its not to hard to test in the game tick ( fired from onEnterFrame). What I'm wondering is if it would be possible / useful to create a custom event that i can listen for. And make the eventListener hear when a collision happens. Also would this be better or worse for the cpu than testing the collisions of lots of enemies on a screen?
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