ActionScript 3.0 :: Class Instances And Null Values?
Sep 22, 2008
I'm currently stumped by this. I've created a class to load xml data from a txt file, then assign that xml to a variable named siteStructureXml. When I trace the value of siteStructureXml from within the class instance it shows the expected xml data. When I try to assign the value to a variable returnedXml defined on the timeline of my movie, it's value traces as null. I've a feeling it's something blindingly obvious..
[Code]...
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Oct 26, 2009
I'm trying to load a xml file into my model class. I am loading it with a load class definied in the model.
I am calling the load class from the document class. If i then try to trace the object and the xml varibale I get a NULL value.
[Code]...
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Oct 27, 2011
I have an arbitrary number of object instances on the stage. At any one given time the number of objects may be between 10 and 50. Each object instance can move, but the movement is gradual, the current coordinates are not predictable and at any given moment I may need to retrieve the coordinates of a specific object instance. Is there a common best-practice method to use in this case to track object instance coordinates? I can think of two approaches:
I write a function within the object class that, upon arbitrary event execution, is called on an object instance and returns that object instances coordinates.
Within the object class I declare global static variables that represent x and y values and, upon arbitrary event execution, the variables are updated with the latest values for that object instance.
[Code]...
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Jan 2, 2010
I'm trying to create a simple ripple effect made of circles created using the drawCircle() method. Afterwards I animate the circle by changing it's size and alpha value. The final radius of the circle and the position is random.
How do I create multiple circles/ripples?[code]...
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Jan 5, 2010
how subclasses,instances,and inheritance work. The below code isn't actual project code, it's theoretical code, generalized to a simplistic level so that we can talk about the big issues.Let's say I have animals_app.fla, with a "Dog" class MC and a "Cat" class MC. Both "Dog" and "Cat" are subclasses of "Animals"; animals_app.fla uses document class "Main".
Intuitively, I think Animals should declare that every subclass should have some animalSpecies, and each subclass will define the value of its own animalSpecies. It wouldn't make sense for Animals to provide any default value, because it will always be different per subclass. Is this correct? I had tried out some code similar to that below, and was perplexed because it seemed like whenever a subclass tried to define a value for its own animalSpecies variable, it was actually changing the value of the variable in the Animal class, but that's not what I want. How do I rewrite this code so that each subclass defines the values of variables it inherits from its superclass, without altering the superclass? And how would I define the value of variables for each instance of a class, so that I'm only changing the values of that instance, without altering the subclass?
Animals.as
Code:
package
{
import flash.display.MovieClip;[code]..........
Also, conventionally, what should be in my Main class? Only the addChild code which attaches MCs to the stage? Or should the values of variables be defined in Main? What am I missing? I recently read Foundation Game Design with Flash and didn't feel like the explanation was sufficient. I've tried scouring the web for OOP tutorials, but they're either too basic or too far over my head.where I should be defining values of variables for classes, subclasses, and instances?
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May 16, 2011
I am currently trying to create a piece of code that will retrieve values from a 2D array and use them as x and y values to position instances of a MovieClip called mcMain. The code for the array will look something like this...
Code:
var lvlMain:Array = new Array();
lvlMain.push(new Array());
var xAxis:Array = new Array([150,400,200,300,100]);
[Code]....
how to create a piece of code that would retrieve the x and y coordinates listed in the arrays and use them to create instances of mcMain. So going from the code above it would create the first instance at x=150 and y=100, second instance........fifth instance at x=100 and y=500.
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Jul 8, 2007
I want to know how to make class instances into listeners and broadcasters, from inside each class. Here is what I am trying specifically... part of the Proj class... (projectiles, as a matter of fact)
Code:
private function listen():Void {
u.register(this);
onUpdate = function(){
step(); // a function I have which makes the projectile move (not shown)
}
}
where "u" is another class, the Updater class with this code...
Code:
class Updater {
// const. --- make this a broadcaster
public function Updater(){
[code]....
PS: What is the syntax for using AS2 code tags instead of just "[CODE|"?
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Jul 16, 2009
I'm slightly new to Flash CS3 + AS3 combo, so its more of a lack of practice question. My question stems from the problem described here http:[url].... . Note, its not the same problem, its a new one.The Problem ,So I have multiple library assets (which are on teh stage) and I want to assign similar functionality to all of them.
Attempt 1: So I create the n assets, create a custom class in AS3, link them to Flash CS3 and obviously enough it gives me the error that multiple assets can't be linked to the same class.Obvious enough to understand (well not completely, because from a programmers background it doesn't make sense).
Attempt 2: Same as attempt 1, but instead of linking all the assets to the same class I make the base class the same class, and let the derived class be dynamically created by Flash on compile time.So the linking works, but the problem is, in my base class I have a method which does something (say an tween) on a child of the library asset. So if the assets on the stage/library are called asset1, asset2, asset3 (same name for asset name, class name, id name), each of them has a sub-movieclip called ... say 'foo'. now if I manually wrote a class for each asset, I could do 'this.foo' to play with the sub-movieclip. However since this functionality is in the parent class, I'm unable to do it.
P.S. If you're form a programming/OOP background, its basically a abstract class problem. My Base class knows how to doSomething(), but it needs aSomething, which is defined in the Derived classes. However I found out that AS3 classes don't support virtual(C++ )/abstract (Java) in the true sense of the word (unless I missed some obvious documentation).
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Dec 23, 2006
Let's say i have a bunch of balls/cells. I'm having trouble figuring out how to make it so that every other ball bounces off of every other ball.
so in short, it's really one instance being able to check all other instances of the same ball class?
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Jul 25, 2011
I've been hitting dead ends while programming lately all over, and I finally came to the realization all the code I have that is broken is because I don't know how to interact with instances of one class from within another. Here's the gist of what I am trying to do:
if(this.hitTestObject(targetClip)){
trace("hit!");
}
The problem is, if I address a single instance that is on the canvas, I get "access to undefined property targetClip", even though the document class can interact with it fine. If I target the class file of targetClip, I get "Implicit coercion of a value of type Class to an unrelated type flash.display:DisplayObject". It isn't just a problem with hitTest either, I'm having this problem with other actions, so there is some basic syntax I'm failing to comprehend.
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Nov 25, 2009
Have recently started de-activating "automatically declare stage instances" in order to get code-completion for stage assets in FlashDevelop and also because I find it's better to have visible declarations of all class properties. Problem is that I'm getting some weird issues with TextFields being null for no apparent reason. For example, I have a MovieClip with a linkage class - this works fine. Any Sprites within it work fine and can be accessed in the Class itself. However, all TextFields are null despite being declared in the Class and instance named in the IDE.
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Sep 7, 2010
I have two document classes. One is Main.as the other is Step2.as. I want to declare a public variable in Main.as then need to give it a value from Step2.as. That value will later be used in my next Document class Step3.as How would I write the code that gives the value in my Step2.as and then how would I write the code that retrieves the value in my Step3.as?
Note I can't import my Step2/ or Step3 document class into my Main.as.
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Feb 17, 2009
Is it possible to create 2 instances of 1 class (for example: "Header"). Add these 2 instances to the stage on different positions. This Header class contains some buttons and what I want, is: when I rollOver one of these buttons, both buttons in the 2 Header instances are "rollingOver".
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Oct 4, 2010
I have a piece of code, that moves an array depending on it's type. If the array is of TypeA objects, it will change TypeA. If it is TypeB it will change TypeB. The issue with the current code is the repeative blocks.
[Code]...
Which stops working whenever I need to access any property (user) selectedInstance.testSomething();
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Sep 17, 2011
I need to get all the instances in my stage according to an especific class name. I'm doing this:
var class_ref:Class = getDefinitionByName('fran.MyOwnClass') as Class;
var element;
for (var i:uint = 0; i < this.parent.numChildren; i++)
{
[Code].....
But I want a better way (more efficiently, without checking all the MCs).
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Oct 8, 2009
I recently learned how to use gravity so I made a bouncing balls program but I have an issue with the interaction between the frame timeline code and the class.The problem is that when I create instances with a timer, I declare the variable inside the timer function. And I want to add a blackhole sort of thing when I click down on the stage but I cannot access the object from the blackhole function since it's declared inside the timer.
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Aug 30, 2009
I have a class the extends a movie clip with some dynamic content in it.I need 15 instances of this class so i created a for loop for that.Im using the same variable name but im just initializing it again and again.
var thumb:MovieClip = new ThumbClass();
addChild(thumb)
my probem is that i need to find a way to control them after i created them.
[code]....
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Apr 15, 2012
I got a ton of movieclips in a class. Is there a more efficient way to apply a function to every instance in the class other than this?
var textArray:Array = [
interludes.interludeIntro.interludeBegin1,
interludes.interludeIntro.interludeBegin2,
[Code]....
I have NO idea why the above doesn't work. I want to turn every single instance in the class interludeIntro invisible, but I want to turn specific instances visible later.
how to insert code on this website, pressing "code" doesn't do anything, so pardon the bad formatting)
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Oct 8, 2009
Let's say I have created a class named Store. This class has several elements such as Name, PhoneNumber, Owner. I've created 2 instances of this class and want to know which values are different. So lets say that Store1 and Store2 are instances of this class.
Store1.Name = "John's Corner";
Store1.PhoneNumber = 111222333;
Store1.Owner = "John";
Store2.Name = "John's Corner";
Store2.PhoneNumber = 444555666;
Store2.Owner = "John";
[Code]...
Is there a way to automatically loop through all elements of a class instance and compare them to the same element in another class instance and return something when they differ?
This might be obvious but I can't figure it out.
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Feb 23, 2011
I'm new to this OOP stuff, and I'm having a hard time understanding all of this.I'm trying to recreate in AS3.0 with classes a simple whack-a-mole game I created in AS2.0 using timeline coding.I've read through a lot of forums, but I still don't understand what exactly I'm doing wrong.Heres my setup:I have a movie clip named mrBunny (my girlfriend told me to change it to bunnies as moles were too ugly.). Now there are 6 instances of mrBunny on the stage, each named mrBunny0-5.The mrBunny symbol is linked to the com.mrBunny class.The class has a method called randomPlay(); which I use to randomize the animation times of mrBunny.I also have a button on the stage with the class stageBtn.
package com{
import flash.display.SimpleButton;
import flash.display.MovieClip;
[code].....
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Dec 9, 2004
Is it possible to rename a class-instance that has already been created with a specific name?For instance:
// Step 1) Create and name class-instance
var myClassInstance_1:myClass= new myClass();
// Step 2) Change name of myClassInstance_1
[code].....
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Jul 4, 2003
[Code]...
this's been bugging me, anyone know what's wrong?
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Jun 11, 2009
I am making an AS 2.0 Class for polygons called "Shapes2". Shape2 is basically an array of Vectors (another Class I made) and is built using the function addPoint(x1,y1) to build the shape from a series of points. The points are then converted to vector-edges, etc etc.Here's the long and complicated construction:
Code:
var pent:Shape2 = new Shape2();
var rect:Shape2 = new Shape2();
if I comment out either instance, the other is functional when I test it. Trying to do two instances makes rect and pent point to the same array of vectors, but they keep other variables and properties separate, which means rect isn't just pointing directly to pent or visa versa.
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Feb 3, 2010
I have four instances of the same class called Tile, that is bound to a movieclip with four frames. They're imbedded in a movieclip that I'm using to hold all of the visuals.In the main class of my .fla I declare a variable called menu1 that is bound to another movieclip with 2 buttons on it.
I'm trying to make three things happen here: on clicking the Tiles the menu will pop up over the tile that was clicked; that on clicking another tile when the menu is already up it will close that one before adding a new one; and lastly, that on clicking the second button in the menu, it will change the frame of the tile clicked and close the menu.The tile.as has an addeventlistener in it's construction method to add the function onTileClick to each Tile.
public class Tile extends MovieClip{
public function Tile():void{
addEventListener(MouseEvent.CLICK, onTileClick);[code]....
This works fine for one tile. I can click on it, the menu pops up, I can close and reopen the menu as many times as I want, and I can use the other button with no problems.Also, clicking around on different tiles moves the menu around without repeatedly adding it, so that seems to be working fine as well.The problem is this: If I click on a tile, close the menu, then click on another tile and close it, I get an error 1009.It still closes, that error just comes up. And it will come up for any more tiles I open and close it on.Then, after clicking on however many tiles, if I do click the advance button, it affects all of the tiles, and I get an ArgumentError: Error #2025 for each tile clicked on.I tried adding a variable that held the event.target value in the onAdvance function, and using that for the gotoAndStop, but the same thing happened. When I tried tracing the name of the variable, I noticed that it was tracing the names of each tile clicked with each subsequent trace.
Am I building this all wrong?I thought that making a class for my tile object, and adding eventlisteners to the class, and adding the functionality of the tiles inside of the class would be good practice for Object Oriented Programming, but it seems to be producing nothing but errors. When I defined these tiles inside the main timeline, with separate event listeners, I didn't have this problem
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Jan 29, 2011
I'm trying to make it so that the instances of the class "Enemy" stop completely when they get too close to each other. They are circles so determining a collision is easy. But when I used this code:
Code:
if (Math.sqrt(Math.pow(x-_root.newEnemy.x, 2)+Math.pow(y-_root.newEnemy.y, 2))<=width+3) {
canMove=false;
}
[Code]....
This code works just fine when I test it against the instance of a different class, but it's not working for some reason.
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Jun 9, 2011
I have a class - call it MyClass - and an instance of that class with instance name myObject.In MyClass I declare:
public var myVariable:Number;
In the main timeline I try to set it using myObject.myVariable = 3;
In the main timeline, if I do a trace (myObject.myVariable) it will return 3. Within the class, if I do a trace of (this.myVariable) it returns null.However, if I add a line of code in my class and add this.myVariable = 3, it traces 3.Why can't I get myObject to correctly change its own parameters?
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Jul 17, 2009
I've created a movie clip and placed it in the library. I've given it a class name via the properties panel in the library. Every time I drag it to stage I want to make sure its alpha is set to 0. If I drag 300 of those clips to stage, is there a way to reference the class name I gave it in order to automatically set the alpha value as soon as they're dragged into the stage?
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Apr 1, 2010
I'm writing a series of Search windows for an application. I create the FLA files on the stage, each has 3 simple buttons: next_btn, prev_btn, and close_btn. Those all have event listeners which call findNext(), findPrev() and closeWin() respectively. Each search window looks for different things, some with a text box and some with a combo, etc.
So I have a base class com.search that extends Sprite and adds the eventListeners at startup (actually, on addedToStage). Like this:
function isAddedToStage(evt:Event){
next_btn.addEventListener("click",findNext); prev_btn.addEventListener("click",findPrev); close_btn.addEventListener("click",closeWin);}
[Code]....
If I add the event listeners in the derived class rather than the base, it works fine. But that seems to defeat the purpose of inheritance, plus it infers that I won't be able to derive new classes/swfs from those derived classes.
how does one reference objects created on the stage from a base class of that document's class?
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Apr 14, 2011
new a class [code]Now ,I want call function newCourse many times and don`t new class again.
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Feb 17, 2011
i am trying to create a menu using as3 and i cant seem to find a way to finish it.this is what i got so far
so i wrote a class that is attached to a movieclip and i put several instances of it on the stage.
package {
import flash.events.Event;
import flash.events.MouseEvent;
import fl.transitions.Tween;
import fl.transitions.TweenEvent;
import fl.transitions.easing.*;
import flash.display.*;
[Code]...
I wanted the animation to not roll back once i click on a certain button and i wanted the animation to go back once i click on a different button. My question is, how do i proceed from here, i searched online for clues and from what i understood i could set variables within the class and change them on the timeline and use event listeners to catch the changes. I tried doing that but i always end up with some redundant way that gets me nowhere...
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