B4A Library libGDX - Game Engine

Jaames · Aug 28, 2014

ilan12041981 said:
hi,

does the libGDX contains the possiblity to control the accelerometer or the gyroscope?

yes

ilan · Aug 28, 2014

and how? how do i declare it? and how do i use it? do you have a simple project or anything else that can explain it to me? like the jumping smiley example of erel.

Jaames · Aug 28, 2014

ilan12041981 said:
and how? how do i declare it? and how do i use it? do you have a simple project or anything else that can explain it to me? like the jumping smiley example of erel.

In the Activity_Create you set the configuration like this :

B4X:

Sub Activity_Create(FirstTime As Boolean)
    'Initializes libGDX
    Dim Config As lgConfiguration
    Config.useAccelerometer = True
    Config.useWakelock = True
    lGdx.Initialize2(Config,"LG")
End Sub

and in the update method of libGdx (or in the Rende method) you read accelerometar inputs like :

B4X:

'this is just to show where to read inputs, it's a bit complicated than this
someSprite.position.set(lGdx.Input.AccelerometerX, lGdx.Input.AccelerometerY)

I assume that you declared in the sub Globals your libgdx like :

B4X:

Dim lGdx As LibGDX

ilan · Aug 28, 2014

wow thanx, so if in need to move the lgtexture i just draw it with the new calculated "lGdx.Input.AccelerometerX,...Y" parameters.

should not be so hard to do, thanx a lot Jaames i will try it when i get home

Informatix · Aug 28, 2014

Jaames said:
In the Activity_Create you set the configuration like this :

B4X:

Sub Activity_Create(FirstTime As Boolean) 'Initializes libGDX Dim Config As lgConfiguration Config.useAccelerometer = True Config.useWakelock = True lGdx.Initialize2(Config,"LG") End Sub

and in the update method of libGdx (or in the Rende method) you read accelerometar inputs like :

B4X:

'this is just to show where to read inputs, it's a bit complicated than this someSprite.position.set(lGdx.Input.AccelerometerX, lGdx.Input.AccelerometerY)

I assume that you declared in the sub Globals your libgdx like :

B4X:

Dim lGdx As LibGDX

The PacDroid demo and its tutorial shows and explains this.

ilan · Aug 28, 2014

ok thank you Informatix i will check that too.

notedop · Oct 8, 2014

Awesome library, i've been playing around with it for some days now with some nice results.
Had some struggles in the beginning however there are a lot of docs and tutorials available for the java version.
With some logic applied the tutorials are portable to B4A code.

Thanks for porting this to B4A!

eps · Oct 8, 2014

@notedop would you mind posting links to some of the tutorials and information you've found the most useful.

shashkiranr · Oct 8, 2014

@notedop yes would help a lot of people. Do post the tutorials if possible.

notedop · Oct 8, 2014

Offcourse, for my investigation on Sprites, i've used :
https://github.com/libgdx/libgdx/wiki/2D-Animation

https://github.com/libgdx/libgdx/wiki
This is basically the wikipedia for libgdx.

In addition the youtube tutorials from Dermetfan are very usefull. I've used them to get more understanding on what is possible with Tiled maps. If you go to his channel, you'll find more workshops on Libgdx.
https://www.youtube.com/user/dermetfan

Beside these, I keep going back to the examples provided with the posts from @Informatix and his extensive explanations. (see Original post/thread starter)

notedop · Oct 21, 2014

How are TiledMaps rendered? Are all tiles rendered or only the ones which are within the camera view?
I'm trying to understand if I would generate a huge map in Tiled, how it will affect performance.

The idea is to create an horizontal scrolling map, moving the camera horizontally.
Offcourse I don't want the level to be done in 30 seconds meaning the level should be rather wide.

Informatix · Oct 22, 2014

notedop said:
How are TiledMaps rendered? Are all tiles rendered or only the ones which are within the camera view?
I'm trying to understand if I would generate a huge map in Tiled, how it will affect performance.

The idea is to create an horizontal scrolling map, moving the camera horizontally.
Offcourse I don't want the level to be done in 30 seconds meaning the level should be rather wide.

Only visible tiles are rendered. Having a very small map or a huge map is the same. Only the number of visible tiles at a given time matters.

notedop · Nov 1, 2014

I'm unable to set the position of a lgbox2dcircleshape which has been loaded from a tiled map.
I've used log to debug and noticed that there is no effect whatsoever using the Set or Set2 of the lgbox2dcircleshape function.

B4X:

        Dim ObjCircle As lgMapEllipseMapObject = Maps.Layers.Get2("ObjTest").Objects.Get(i)
        'ObjCircle.Ellipse.Set(ObjCircle.Ellipse.x*scale,ObjCircle.Ellipse.y*scale,ObjCircle.Ellipse.width*scale, ObjCircle.Ellipse.height*scale)
       
        Log("Object Circle: X-" & ObjCircle.Ellipse.x & " - Y: "  & ObjCircle.Ellipse.y)
       
        Dim v As lgMathVector2
        V.Set(ObjCircle.Ellipse.x*scale, ObjCircle.Ellipse.y*scale)
        Log("Vector: " & V)
           
        Dim CircleShape As lgBox2DCircleShape
        CircleShape.Radius = (ObjCircle.Ellipse.height/2)*scale
        CircleShape.Position.Set2(V)
'        CircleShape.Position.x = ObjCircle.Ellipse.x*scale
'        CircleShape.Position.y = ObjCircle.Ellipse.y*scale
        Log("Scale=" & scale & " Shape Circle: X-" & CircleShape.Position.x & " - Y: "  & CircleShape.Position.y)

Below is the Log output, which shows that the Set function did not have effect.
Am I missing a step here?

B4X:

Object Circle: X-27790.69921875 - Y: 224
Vector: [416.86047:3.36]
Scale=0.014999999664723873 Shape Circle: X-0 - Y: 0

Informatix · Nov 3, 2014

notedop said:

I'm unable to set the position of a lgbox2dcircleshape which has been loaded from a tiled map.
I've used log to debug and noticed that there is no effect whatsoever using the Set or Set2 of the lgbox2dcircleshape function.

B4X:

        Dim ObjCircle As lgMapEllipseMapObject = Maps.Layers.Get2("ObjTest").Objects.Get(i)
        'ObjCircle.Ellipse.Set(ObjCircle.Ellipse.x*scale,ObjCircle.Ellipse.y*scale,ObjCircle.Ellipse.width*scale, ObjCircle.Ellipse.height*scale)
      
        Log("Object Circle: X-" & ObjCircle.Ellipse.x & " - Y: "  & ObjCircle.Ellipse.y)
      
        Dim v As lgMathVector2
        V.Set(ObjCircle.Ellipse.x*scale, ObjCircle.Ellipse.y*scale)
        Log("Vector: " & V)
          
        Dim CircleShape As lgBox2DCircleShape
        CircleShape.Radius = (ObjCircle.Ellipse.height/2)*scale
        CircleShape.Position.Set2(V)
'        CircleShape.Position.x = ObjCircle.Ellipse.x*scale
'        CircleShape.Position.y = ObjCircle.Ellipse.y*scale
        Log("Scale=" & scale & " Shape Circle: X-" & CircleShape.Position.x & " - Y: "  & CircleShape.Position.y)

Below is the Log output, which shows that the Set function did not have effect.
Am I missing a step here?

B4X:

Object Circle: X-27790.69921875 - Y: 224
Vector: [416.86047:3.36]
Scale=0.014999999664723873 Shape Circle: X-0 - Y: 0

A shape is not what you think. You should read a tutorial about Box2D, like this one.

notedop · Nov 3, 2014

Circle.Position is the position relative to the body. Position of the body should be set in the Bodydefinition, which should position the shape correctly.
Right?

Informatix · Nov 4, 2014

notedop said:
Circle.Position is the position relative to the body. Position of the body should be set in the Bodydefinition, which should position the shape correctly.
Right?

It's almost right. The shape is used by the fixture (and defined in the Fixture definition), which is used by the body. The position is set in the Body definition.

notedop · Nov 13, 2014

sterlingy said:
My emitters load very large. There's no way to set a scale to the Effect or the Emitter, though I do see lgParticleScaledNumericValue, but can't figure out how to use it.

Can you share/advise the settings you've used to solve this within the particle editor?

Edit: Nevermind, i got it. Scale the size and velocity in the particle editor. Use the Pix2Met value in the editor properties to make particle effect better visible for further editing.

wonder · Nov 16, 2014

Hello again,

A few weeks ago while reading one of the few libGDX threads, I encountered a post that mentioned some constrains to the texture size.
It should be a multiple of something or something like that.

I have no idea where I read it anymore, so please, if anyone knows what I'm talking about, point me in the right direction or post a short explanation to this matter.

Many thanks in advance!!

Informatix · Nov 17, 2014

wonder said:
Hello again,

A few weeks ago while reading one of the few libGDX threads, I encountered a post that mentioned some constrains to the texture size.
It should be a multiple of something or something like that.

I have no idea where I read it anymore, so please, if anyone knows what I'm talking about, point me in the right direction or post a short explanation to this matter.

Many thanks in advance!!

If you don't use mipmapping, your textures can have any size or ratio. For mipmapping, their size must be a power of two (e.g. 512x512, 1024x1024).

wonder · Nov 17, 2014

Thank you!!! I was looking for that info!

Another question if I may... Is there any way to limit the speed of the libGDX? Not the animation speed, but the engine speed itself.
Although my project runs quite well on all emulators and devices I tested so far, I'm having a hard time with an HTC M7, it runs too fast.

I managed to create a "speed limit" myself but I'm not entirely happy with the results.

B4A Library libGDX - Game Engine

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