ActionScript 3.0 :: Constructor Functions Of Multiple Classes?
May 16, 2009
I have a rather general question regarding OOP. How do constructor functions execute with multiple class extensions? I'm making an orbital physics simulation, and every spatial body is of the class SpaceObject, which extends Sprite. Then, I have all earth-type planets be of the class Earth, which extends SpaceObject. There are certain parameters that I'd like to set for every single SpaceObject (like position and size) in the constructor function, and certain parameters (like density and mass) that I'd like to set in the constructor of class Earth.But from the main timeline, when I create an instance of class Earth, I can only enter the parameters of the Earth constructor, ie
Code:
var planet1:Earth = new Earth(density, mass)
Or I can create an instance of SpaceObject:
Let's I have a class Square that has a several functions. I want to call it from a class Grid, which is a group of Squares.So in the class file for Grid, how would I do this:
Code: public function doSquareFunction(thisFunction:Function):void{ square1.thisFunction();
I have three classes (shown below, after the problem description).The first class (InteractiveStrategy) is the main class definition. In there I declare and instantiate two variables, download and upload, both of DataTxRx class.
On instantiation the folowing error pops up>> 1203: No default constructor found in base class strategy:DataTxRx public function Question(){ The second class, DataTxRx does two things only, either to download data or to upload data. As shown in its constructor, if the required parameter 'direction' is equal to DOWNLOAD, it calls the DownloadData() function. Similary, it calls the UploadData() if the required parameter is equal to UPLOAD.
The third class, Question extends the DataTxRx class, but itself has no constructor. However it has other methods(not shown) for adding, modifying and deleting questions anomg others.
Is it OK to use the constructor to set properties for a value object class or must I use dot notation and set each one, one-by-one? I recently read an article that was saying I should do it one-by-one as value objects should only contain properties and went on to say using the constructor is not OK (best-practice wise).
Code: ("not OK") var employee=new[code].............
Im new to AS3.[code]I have above code in a movieclip which i have Exported as a Class.But when i run it says "Constructor functions must be instance methods".
I'm used to building applications using pure AS3. I always pass dependencies into the constructor of classes I make, but this method seems to not work out well for Flex MXML views. It seems like I should define setters on the MXML class, which map to attributes in the tag/class instantiation. But using this method I cannot specify which properties are required and in what order I expect them etc. What is the preferred method to give a Flex view it's dependencies?
Can I define a custom class to be an AsBroadcaster in the classes constructor?
Code:
class myClass{ function myClass(){ AsBroadcaster.initialize(this); } }
And if so will that give me the ability to addListeners to an instance of that class?
The reason I want this approach is because I want to broadcast events from inside one of the custom classes methods and I want a textField on the stage to be listening for that broadcast message.
I am follwoing a tutorial on linda.com about creating a website in Flash everything was going well until i started trying to copy the action script in the online examples now I keep getting this error message and can't figure out how to get rid of it:
The examples I'll use don't do anything - they're classes without ANY members - no variables, methods, anything.
Let's say I extends Sprite and call it MySprite.
I save it in test.core
[code]...
Now I create another custom class called MyWindow that extends MySprite.
I save it in test.windows
[code]...
Then I create another class that extends MyWindows (the example I'll use is a document class - but that doesn't matter - I've tested using an instance too).
[code]...
Notice that I'm not even trying to instantiate the helper classes - just having them there throws the error.
If there is only a single helper class, everything runs fine.
Also note that - as far as I can tell - this only happens when extending one class from another package, then extending that class with more than one helper object.I'm pretty sure there's no namespace bumps or typographical errors, as this is a very pared-down version of the original application.
EDIT: seems the problem exists even without the crossing packages - even extending MySprite in the document class with multiple internal classes generates this error.
so I'm having this problem where one of my classes can't locate a function. The function it's trying to use is in another class, so I was wondering if there was something special you had to do. This is what I'm basically doing: One class
I have to create a game in flash for school. I'm kind of stuck, however. I know an approach that might work, but I'm wondering if there isn't a way to do it all-in-one. Here goes.
I have a start screen with 4 buttons. These buttons all link to different levels, and they all have a different image. Let's call them btn1 btn2, .. btn4. I made a class called 'GameButton':
[Code]...
The other approach I see is to create four different button classes and link each of them to a different button, but then I'd have to create for files for something really simple, which seems like a lot of trouble for well.. just adding a button.
EDIT: I just realised this might be a stupid question. However, isn't there a way to like make a constructor for an empty button, then maybe add a symbol to it?
Let's I have a class Square that has a several functions. I want to call it from a class Grid, which is a group of Squares.So in the class file for Grid, how would I do this:
Code: public function doSquareFunction(thisFunction:Function):void{ square1.thisFunction();
I have Flash project that is set up something like this:
myProject.fla
- document class = myMenu.as
- the document class imports a menu item from menuItem.as (import menuItem;)
I have a function in myMenu.as that sets the text formatting for all the text fields on the page. I want to be able to use this same function in menuItem.as so that all the formatting is consistent & you only have to change it in one place. How do I access this function from both myMenu.as & menuItem.as?
okay, i'm refactoring a huge ActionScript file, and so trying to move some functions into their own classes. why is this not working? i've got a function in my primary class:
// ... private var testBlock:Sprite; public function testingINT() { testBlock = new Sprite();
I'm coding a small flash game, and wan't to access different functions between classes. In C# I'm used to just making it static, but I'm having some problems with it.Here goes:
This probably has a simple solution, but I'm a complete newb to actionscript and I could really use some guidance.I have a file, called Politismos.fla. The document class of this file is: com.plaidfox.PolitismosClassPolitismosClass.as is as follows:
I've been working my way towards better OOP design lately and I've come across a problem with accessing functions in other classes from my Main class. Here is the code:
They are listening for functions that are within the Player.as class, these functions control the dynamics/movement of the player itelf. But for some reason I'm getting a 1120 error(access of undefined property). Basically how do you listen/access for functions within a different class?
asically I have a Player class with methods (i.e. Moving the player) that I want to listen for and implement in the main class. To put it simply, I'm creating the player methods in the player class and then calling them in the Main class. But for some reason I'm having some trouble, I'm still trying to get used to all this OOP design.Here is the (Main) code, it's not alot:
in my Main class, i try to call a function from another class, but when i compile i get this error:1136: Incorrect number of arguments. Expected 1.i have seen some fixes involving an event in the OtherClass and (null) when i call it, but it dosent seem tohere is a code that describes my problem, what do i have to do to make this kind of code work?m i doing it wrong, or do i have to do something else?OtherClass
I am being told that this error takes place on Line 3, which is blank. I can not figure out what the problem could possibly be.
package { import flash.display.*; public class toppings extends MovieClip { var inventory:Sweettreat; function toppings() { inventory = new Sweettreat(this); inventory.makeSweettreatItems([MCsprinkles,MCchocolate,MCcaramel,MCnu ts,MCcherry]); } }}
I was wondering if ActionScript had some way to call functions and classes from variables, like they do in PHP:
function funcname() { print "Potatoes come from tree"; } $function = "funcname"; print $function; // Prints out "funcname" $$function(); // Prints out "Potatoes come from tree"
In case you don't know the syntax for PHP, you should know that anything perpended with a $-symbol is a variable.
I have a flex application that loads swf files and displays them using the SWFLoader object.is there a way to provide different classes and functions for the swf application to use? [code]...
I have a Flash application that creates a sort of powerpoint presentation. All the 'slides' are stored in an XML files which is read and processed.
I'm trying to build the presentation using this XML file. At the moment, my main class has it's initial function main and a static function processXML main initiates my database class with a function called initDB. One of my issues is that initDB forgoes processing because it's dependant on an event listener. On completion of loading the XML files, the event listener initiates my static function on my main to create objects from this file.
The issue is that because the event listener continues the processing (after an indeterminate amount of time), the functions are no longer controlled by the main class.
