B4A Library libGDX - Game Engine

Computersmith64 · Apr 2, 2014

Informatix said:
It seems that you use GenyMotion or a similar emulator. Do you have the same errors on a real device?
The main reason that I know for a crash while exiting is a call to dispose for an uninitialized object. You should check whether the object is initialized before disposing it: if myTexture.isinitialized then myTexture.dispose

It is very important to dispose properly the used resources because, contrary to the data in the Java heap space, there's no garbage collector for the libGDX resources (most of them are stored in the native heap memory).

Yeah - I use GenyMotion, but it happens more consistently on real devices as well. I will take another look at the disposal of those objects. One more question:

Should I also call the LibGDX Exit method & does the LG_Dispose event ever get called (it doesn't seem to)?

Thanks,

- Colin.

Informatix · Apr 2, 2014

Computersmith64 said:
Yeah - I use GenyMotion, but it happens more consistently on real devices as well. I will take another look at the disposal of those objects. One more question:

Should I also call the LibGDX Exit method & does the LG_Dispose event ever get called (it doesn't seem to)?

Thanks,

- Colin.

Exit calls internally Activity.Finish

Computersmith64 · Apr 2, 2014

OK - so I shouldn't call exit myself? Also, should I put the object dispose calls in the Dispose event instead of the Activity_Finish? Oh wait - are you saying that if I call Exit, it will call Activity.Finish?

Thanks - Colin.

Informatix · Apr 2, 2014

Computersmith64 said:
OK - so I shouldn't call exit myself? Also, should I put the object dispose calls in the Dispose event instead of the Activity_Finish? Oh wait - are you saying that if I call Exit, it will call Activity.Finish?

Thanks - Colin.

It's probably better to call directly Activity.Finish because there's maybe some code added by Erel in the Finish method of B4A (I didn't check). Anyway, in all cases, the Pause event of your app will be raised. In this event, you have to call the Pause method of libGDX that's responsible for triggering the Dispose event (where all your Dispose calls should be made).

Computersmith64 · Apr 2, 2014

Informatix said:
It's probably better to call directly Activity.Finish because there's maybe some code added by Erel in the Finish method of B4A (I didn't check). Anyway, in all cases, the Pause event of your app will be raised. In this event, you have to call the Pause method of libGDX that's responsible for triggering the Dispose event (where all your Dispose calls should be made).

OK - thanks. I'll give it a try.

- Colin

Computersmith64 · Apr 2, 2014

Computersmith64 said:
OK - thanks. I'll give it a try.

- Colin

Fixed it - I wasn't calling LibGDX.Pause on a UserClosed Activity_Pause - so of course the Dispose event wasn't being called... DOH!

- Colin.

Computersmith64 · Apr 6, 2014

Hi Informatix,

Is there a way to take a screenshot in LibGDX? I don't see any obvious built-in functionality, so thought that populating an lgPixmap using glReadPixels might be the way to go, however I'm not sure how to convert this to a bitmap so that I can write it out to a file. Or am I going down the wrong track here?

Thanks - Colin.

Informatix · Apr 7, 2014

Computersmith64 said:
Fixed it - I wasn't calling LibGDX.Pause on a UserClosed Activity_Pause - so of course the Dispose event wasn't being called... DOH!

- Colin.

The Pause function of libGDX should be called in all cases, so your first line of the Activity Pause event should always be:
If lGdx.IsInitialized Then lGdx.Pause

Informatix · Apr 7, 2014

Computersmith64 said:
Hi Informatix,

Is there a way to take a screenshot in LibGDX? I don't see any obvious built-in functionality, so thought that populating an lgPixmap using glReadPixels might be the way to go, however I'm not sure how to convert this to a bitmap so that I can write it out to a file. Or am I going down the wrong track here?

If you want to take a screenshot from within the app, it is a good idea to convert to a pixmap. You can take this Java example as a basis. To save your pixmap to a PNG, you have to use the lgPixmapIO class.

ppgirl · Apr 8, 2014

Hi Informatix,

Today , Libgdx update to 1.0 ,

Do you have plan to update to Libgdx 1.0 ? We are waiting ...

Informatix · Apr 8, 2014

The version number of LibGDX for B4A is independent from the version number of the Java version. I already use the code of the version 1.0 since a few months (the nightly builds). The major differences of the B4A version are:
- not all 3D features;
- no possibility to use your own sprite batcher (who's skilled enough to write one anyway?);
- not all Math classes (no CumulativeDistribution, no DelaunayTriangulator);
- not all widgets for Scene2D (no Dialog, no Tree, no TextArea);
- no viewport class and no skin class for Scene2D;
- no Daydream class.

As I want to stop working on this library, which is complete enough for most needs, I won't add what's currently missing. In the future versions, I will only fix bugs and add things that I need for my own projects (and are of general interest).

ppgirl · Apr 10, 2014

Hi Informatix,

I try your library , and I find a bug that I am not sure.

lgScn2DImage 's rotate() or rotation has no function.

I use your "Scene2D_DragAndDrop" and add rotate() in TgtDarg() for test . then found rotate() is not function .

Sub DogHouse_TgtDrag(Source As lgScn2DActor, Payload As lgScn2DDragAndDropPayload, X As Float, Y As Float, Pointer As Int) As Boolean
DogHouse.OriginX =DogHouse.Width /2
DogHouse.OriginY =DogHouse.Height /2
DogHouse.rotate (30)
'Checks whether the source can be dropped
If Source = Family OR Source = Cat Then
DogHouse.Color = DogHouse.Color.RED
Return False
Else 'Source = Dog
DogHouse.Color = DogHouse.Color.GREEN
Return True
End If
End Sub

Thank in advance!

Informatix · Apr 10, 2014

ppgirl said:
Hi Informatix,

I try your library , and I find a bug that I am not sure.

lgScn2DImage 's rotate() or rotation has no function.

I use your "Scene2D_DragAndDrop" and add rotate() in TgtDarg() for test . then found rotate() is not function .

Sub DogHouse_TgtDrag(Source As lgScn2DActor, Payload As lgScn2DDragAndDropPayload, X As Float, Y As Float, Pointer As Int) As Boolean
DogHouse.OriginX =DogHouse.Width /2
DogHouse.OriginY =DogHouse.Height /2
DogHouse.rotate (30)
'Checks whether the source can be dropped
If Source = Family OR Source = Cat Then
DogHouse.Color = DogHouse.Color.RED
Return False
Else 'Source = Dog
DogHouse.Color = DogHouse.Color.GREEN
Return True
End If
End Sub

Thank in advance!

You probably make reference to an old documentation. Rotate() has been renamed.
To rotate an actor, you have a property (Rotation) that sets the angle of rotation, and a function (RotateBy) that adds a rotation to the current rotation.

ppgirl · Apr 11, 2014

Informatix said:
You probably make reference to an old documentation. Rotate() has been renamed.
To rotate an actor, you have a property (Rotation) that sets the angle of rotation, and a function (RotateBy) that adds a rotation to the current rotation.

Hi Informatix,

I have try 0.97 library , and the "Rotation" and the "rotateby" have no function too.

Base your example , I add rotate after drag . but I can not see the DogHouse any change.

Sub DogHouse_TgtDrag(Source As lgScn2DActor, Payload As lgScn2DDragAndDropPayload, X As Float, Y As Float, Pointer As Int) As Boolean
DogHouse.OriginX =DogHouse.Width /2
DogHouse.OriginY =DogHouse.Height /2
'DogHouse.Rotation =30
DogHouse.rotateBy (30)
'Checks whether the source can be dropped
If Source = Family OR Source = Cat Then
DogHouse.Color = DogHouse.Color.RED
Return False
Else 'Source = Dog
DogHouse.Color = DogHouse.Color.GREEN
Return True
End If
End Sub

Informatix · Apr 11, 2014

ppgirl said:
Base your example , I add rotate after drag . but I can not see the DogHouse any change.

Sub DogHouse_TgtDrag(Source As lgScn2DActor, Payload As lgScn2DDragAndDropPayload, X As Float, Y As Float, Pointer As Int) As Boolean
DogHouse.OriginX =DogHouse.Width /2
DogHouse.OriginY =DogHouse.Height /2
'DogHouse.Rotation =30
DogHouse.rotateBy (30)
'Checks whether the source can be dropped
If Source = Family OR Source = Cat Then
DogHouse.Color = DogHouse.Color.RED
Return False
Else 'Source = Dog
DogHouse.Color = DogHouse.Color.GREEN
Return True
End If
End Sub

I confirm there's a bug. It will be fixed soon. Thanks for the report.

Informatix · Apr 11, 2014

In the new version (v0.98), I fixed the bug reported here. It's surprising that I missed that (it's there since many versions). I also added the FrameBuffer class because I realized it's a very important class (to take screenshots for example or to combine sprites into a single texture, which is faster to draw).

ppgirl · Apr 12, 2014

Informatix said:
In the new version (v0.98), I fixed the bug reported here. It's surprising that I missed that (it's there since many versions). I also added the FrameBuffer class because I realized it's a very important class (to take screenshots for example or to combine sprites into a single texture, which is faster to draw).

Hi Informatrix,

Bug fixed , good job , Thanks!

Can we have any light way/tool to warp 3rd SDK? One stop to port Java library .

Informatix · Apr 13, 2014

ppgirl said:
Can we have any light way/tool to warp 3rd SDK? One stop to port Java library .

I'm not sure to understand your question.
To wrap a Java lib, you need to know Java and the SLC tool if you don't want to install Eclipse.

Asmoro · Apr 24, 2014

Hi Informatix,

I'm trying to use lgMusic class to have a background music and make a loop every time restarting a game level
(use Andymc clony bird libgdx sample)

This is my error notfication:

Parsing code. 0.02
Compiling code. Error
Error compiling program.
Error description: Missing parameter.
Occurred on line: 47
Dim myMusic As lgMusic = lGdx.Audio.NewMusic("bookert.ogg")
Word: )

It's missing an evtPrefix parameter..please explain what I have to look for.

Regards

Note. I even use Dim....As Mediaplayer...still no luck
It was playing the first time the game starts and after restart no response at all.

Informatix · Apr 24, 2014

Asmoro said:
Hi Informatix,

I'm trying to use lgMusic class to have a background music and make a loop every time restarting a game level
(use Andymc clony bird libgdx sample)

This is my error notfication:

It's missing an evtPrefix parameter..please explain what I have to look for.

Regards

Note. I even use Dim....As Mediaplayer...still no luck
It was playing the first time the game starts and after restart no response at all.

Sometimes I wonder whether some questions are serious or not. You have an error message saying "Missing parameter" and you ask what to do? Then, it's simple: add the missing parameter. This parameter, EvtPrefix, is present in hundreds of functions in LibGDX and in other B4A libraries and is described in the help of the function: prefix of the Completed event. If you don't want to use this event, put an empty string.

B4A Library libGDX - Game Engine

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