I am building an app using Starling and have imported the scaffold project however whenever I call getTextureAtlas() it doesn't show the image
this.mLogo = new Image(Assets.getAtlasTexture("powered_by_starling"));
this.mLogo.x = 0;
this.mLogo.y = 0;
this.addChild(this.mLogo);
There are no errors so I am guessing it can find the texture. If I change the name to something that doesn't exist it throws an error 'texture cannot be null'. I am also using
Assets.contentScaleFactor = Starling.current.contentScaleFactor;
and everything is pretty much a standard import of the scaffold as is however I am using Feathers UI screen navigator but I haven't had a blank image issue on other projects.
Edit: I can't seem to get the sprite to work within a class that extends feathers.controls.Screen
Is getAtlasTexture a function that you wrote? Are you using starlings asset manager? If that's the case, you will need a instance of that class, not static method call.
Anyway, try using the Texture class and the static method it offers. You don't need atlas(sprite sheet) for a Image - you will need it however for MovieClip.
Texture.fromBitmap
Texture.fromBitmapData
.... and others, check documentation
If your graphics are embedded, then use this:
var _img:Image = new Image(Texture.fromBitmap(new Assets.EmbeddedGraphic()));
Are you using atf? because the same happened to me until I used png and then it worked
Related
So being new to AS3 but not development in general, during a recent project that I just started I hit an immediate snag where my normal method of OOD is causing errors in AS3.
I created a layer in Adobe Flash called code just to keep everything separate and in frame one under actions I used the following code to get started:
var GameContainerSize:int = 400;
class GameInfo {
var GameID:int;
var HomeTeam:String;
var VisitingTeam:String;
function GameInfo()
{
}
}
This simple code immediately causes an error though
Scene 1, Layer 'Code', Frame 1, Line 4 1131: Classes must not be nested.
And my best guess is this is because the timeline and all code on it exists within a class already. So what should I be doing if I want to develop this program using class objects, or is this even possible in flash?
You can't define classes on the timeline. Each timeline is exported as a class, var and function declarations become members of the class, and frame code is moved to its own frame functions which are called when the timeline reaches that frame. Thus the error is saying "you can't put a class in a class" because the timeline already is a class.
To define classes you must use external .as files with package blocks:
// GameInfo.as
package {
public class GameInfo {
public var GameID:int;
public var HomeTeam:String;
public var VisitingTeam:String;
public function GameInfo(){ }
}
}
In Flash Pro you can link a class to a timeline (document or symbols). Such a class must extend Sprite or MovieClip.
You can also refer to any of your classes from any frame script. For example, you could put on frame 1 of your main timeline:
var gameInfo:GameInfo = new GameInfo();
Typical OOP would involve using external .as class files for almost everything, with only minimal function calls on your timeline frames, like stop() at the end of a timeline or calling a custom function you've added to the class linked to the timeline.
I created a layer
That's not ideal. The problem is that it will not get you any closer to understanding the code, because it isn't code. It's a feature of the flash authoring environment. You might as well spend a day with the drawing tool drawing something.
to keep everything separate and in frame one under actions
Organisation is important, but layers aren't the way to go. As each class definition goes into its own external file, you have to create additional files anyway if you want to create more classes. And you want to create more classes because having only one is horrible object oriented design. Being consistent here is important. That's why people in the comments suggested to use a document class and have no code on any frames. All code is organised in classes. No exceptions1.
Having said all that, I highly advice against using Adobe Flash to learn As3. There's too much obfuscation going on behind the scenes. If you want to learn how to code As3, use a code editor. (or plain text editor + compiler if you prefer). Learning what settings dialog has to be adjusted in order to get what you want is not going to get you any closer to understanding OOD in As3.
I also see package, is this kind of like a namespace and does it need to be named, if not what is its purpose?
No, packages are packages and namespaces are namespaces. Apples and oranges.
Packages are used to organize classes just like a structure of
folders is used to organize the .as fiels of those classes. In fact,
the package is pretty much exactly that folder structure, for example:
flash.display is for all display related classes
flash.events is for events
A namespace allows you to control access to members of a class. Namespaces are very rarely used in As3. Here's an article from grant skinner about namespaces. Personally, I never needed to use namespaces. If you are jsut getting started, you can very well ignore them for now.
That sounds perfect! except I cannot get it to launch on my Win10 machine. I may just end up outsourcing this at this ratio
flash develop is the alternative editor. It's free, fast and lightweight.
my normal method of OOD
You want to extend your definition of normal with
always explicitly specify the access control modifiers
member names start with small letters
public class GameInfo {
private var gameID:int;
private var homeTeam:String;
private var visitingTeam:String;
function GameInfo()
{
}
}
1admittedly, there are top level functions that are pretty much free floating functions without a class. If you want to do oop, this is not what you want. It's for the occasional independent utility function. Stick to classes for now.
I've worked around this with a hack for now, but would rather know if there's a right way to do it. I have a function that churns out MovieClips, which are tiles for a map that I then attach to the stage. It determines which class of tile to use based on a string variable, like this:
// symbolID holds our class name, determined by logic above
var newClass:Class = getDefinitionByName(symbolID) as Class;
var newtile:MovieClip = new newClass();
This works, but only if an instance of the class already exists somewhere else in the code. It could be anywhere-- in the document class, in some buried function of a helper class, it doesn't seem to matter. If not, Flashdevelop throws error 1065, "Variable (the variable) is not defined". I mention that I'm using Flashdevelop because it seems like it might be compiler-specific, but I'm not sure.
My hack fix is to do this:
var a:baseTile;
a as anotherTile;
a as aThirdTile;
and so on, which works, but definitely isn't ideal if I'm going to have hundreds of these tile classes eventually.
Edit: I should add that these movieclips are coming from a .swc file, which comes from Flash Professional.
You have to use the 'hack'.
getDefinitionByName() can only work with classes that exist at runtime. Unfortunately, if you don't make use of a class, it won't be compiled and won't exist at runtime.
Library symbols make getting around this a little easier. If you check the box that has them available automatically at a given frame, you can just make sure your getDefinitionByName() calls are done during or after that frame.
While SWC libraries can include specific classes to include in the build path, Flash compiler will not link unreferenced classes to a SWF; therefore, requires a linkage library.
Example linkage to retain classes:
/** linkage library */
private static const classA:ClassA;
private static const classB:ClassB;
private static const classC:ClassC;
Another option would be to load the classes from a RSL (Runtime Shared Library).
Basically yes, you need to have a strict reference of that class somewhere in your code. You can even make that reference "unreferenced" elsewhere. I have a hundred of classes like this, and I had to make a single Array of these classes, located somewhere inside the project. I have placed it aside the function that calls getDefinitionByName() to make sure the classes are available in that function.
private static const dummy:Array=[Rock01, Rock02,...,Gem01,Gem02,...];
So you can use such an Array listing all your tiles that you have in your project and want to be accessible by getDefinitionByName().
So I have an image that I'm trying to embed to use as a sprite sheet. My problem is that I am receiving no errors at all, but my image can't even be added to the stage. It's like nothing is being loaded at all.
I am using the Flash CS 5.5 compiler. Here is my code:
public class Game extends MovieClip {
[Embed(source='../assets/images/sprite_sheet_1.png')]
private var sheetClass:Class;
private var sheet:Bitmap = new sheetClass();
public function Game() {
addChild (sheet);
}
}
I've also tried fiddling with the x and y values to make sure nothing is just covering it up and I can't see any problems with that, either. It's just not showing up.
I don't understand why it's not working as intended. Any aid would be fantastic. Thanks!
P.S. - I'm trying to embed the sprite sheet because someone recommended it would be a better route than just using URLLoaders, but is that necessarily true? Is it just true because we are talking about sprite sheets for a smallish Flash game?
You need to check a checkbox called something like "Export SWC" under the publish settings. I'm not sure of the exact phrasing because I don't have the same version of Flash that you have.
See this page and this page
I started reading this tutorial: http://active.tutsplus.com/tutorials/actionscript/creating-a-reusable-flash-uploader-with-actionscript-3-0-and-php/
I'm using FlashDevelop, and I pasted the full code into an ActionScript file. The errors I'm receiving are like this:
C:\Users\tempus\Documents\uploaderas\Uploader.as(30): col: 4 Error: Access of undefined property select_btn.
select_btn.addEventListener( MouseEvent.CLICK, browse );
^
C:\Users\tempus\Documents\uploaderas\Uploader.as(31): col: 4 Error: Access of undefined property progress_mc.
progress_mc.bar.scaleX = 0;
...
I understand that the errors appear because the objects have not been declared ( and they appear to be instantiated from somewhere ), but I don't understand how/what should I include to declare them. Could you point me towards a solution?
It's because the buttons are created in the Flash IDE (as the tutorial was meant to be compiled using the Flash IDE). Since the buttons don't exist in the code aspect you get that error.
You can either create the elements yourself via code, or use the Flash IDE and export a swc/swf of the neccessary UI elements and include that in your flashDevelop project. I'm assuming you'll want to do the latter -
in the Flash IDE, open the .fla, open the library panel, find the progress asset, right click it and bring up the properties. Check the "Export For ActionScript" option, then in the 'Class' field give it a unique name like "SelectBtn". Do the same for the 'progress' asset (only a different class name like 'ProgressBar'). Go to the flash publish settings, and on the flash tab select 'export swc'. publish the file and place the published swc in your flash Develop project folder (traditionally the lib folder of your project).
In Flash Develop, right click your swc and choose 'Add To Library'. (You may need to right-click again and go to options and choose the include completely option). Now you can access those classes you setup in Flash. Then in your code, declare and initialize the display assets:
public var select_btn:SelectBtn = new SelectBtn();
public var progress_mc:ProgressBar = new ProgressBar();
You'll also need to do that textField too. It would be easiest just to do it in your code though.
public var label_txt:TextField = new TextField();
Keep in mind you'll need to manually position and use addChild on all three elements this way. If you want to keep the positioning that's in flash, just select all the elements on the stage and press F8 to convert them to a MovieClip. Then in the library setup linkage the same as the others and give it a class name of something like "DisplayAssets" and export a new swc. Then your code would look like this:
public var select_btn:Sprite;
public var progress_mc:Sprite;
public function Uploader(){
var displayAssets:DisplayAssets = new DisplayAssets();
addChild(displayAssets);
select_btn = displayAssets.select_btn;
progress_mc = displayAssets.progress_mc;
//the rest of the code
}
I am trying to get an instance of a specific class from an embedded swf, it so happens the class I need is also the Default Application extending Sprite for the swf. I am able to do this successfully if I load the swf however I want to embed it instead.
The class I want to load is also extending a custom interface. Here is what I have tried but is not working:
[Embed(source="resources/MySwf.swf")]
private var MySwf:Class;
private function someFunction() : void
{
var inst:ISomeInterface = new MySwf() as ISomeInterface;
}
I appreciate any pointers.
Thanks.
Docs for embedding are here:
http://livedocs.adobe.com/flex/3/html/help.html?content=embed_4.html
You should be able to do something like:
[Embed(source='resources/MySwf.swf', symbol='TheExportNameInMyFlaLibrary')]
public var MySwf:Class;
Personally, I prefer to use the Flash IDE publish settings to be have Export as SWC checked. That way, you can just drop the SWC into your FlashBuilder projects' lib folder and be done. Don't have to worry about manually setting each class up like this.