B4A Library libGDX - Game Engine

wonder · Nov 26, 2015

Awesome!! Thanks!!

Regarding the FrameBuffer example (but not related to the Screenshot), what happens if the FBO.ColorBufferTexture exceeds the 2048x2048 (px) size limit?

Informatix · Nov 26, 2015

wonder said:
Awesome!! Thanks!!

Regarding the FrameBuffer example (but not related to the Screenshot), what happens if the FBO.ColorBufferTexture exceeds the 2048x2048 (px) size limit?

It depends on the device. The devices with a resolution bigger than 2048x2048 have a driver able to support this size. But I didn't try to see the result.

ivavilagu · Dec 3, 2015

Hi everyone,

I have two questions

1-I've updated to 1.10 version and I´m not able to draw a lgParticleEffect with the new version. When I try to draw the effect in render event I receive an error. It worked with old version.

B4X:

SnowEffect.Draw2(Batch, DeltaTime) ' java.lang.IllegalArgumentException: sprite cannot be null.

2-I want to animate a character. I have some animations in a sprite sheet. Every animation has different width, so I need to line up the character using a center x variable ( frame_width / 2). Every time I change the animation, I call a function to calculate the new center of the frame and change the x position of the character.

B4X:

Sub LG_Render
'Some extra lines
    .
    .
    .
If (Hero.CurrentAnimation.IsAnimationFinished(Hero.StateTime) = True) Then                                                                           
                ChangeHeroCenter                'Change the x position of the character
                ChangeHeroAnimation(0)       'Change the animation of the character
End If

Batch.DrawRegion2(Hero.frame, Hero.xPOS, Hero.yPOS,Hero.frame.Regionwidth,Hero.frame.RegionHeight)

end sub

The problem is with the last frame before I change the animation.

Last frame before calling ChangeHeroCenter

The same frame after calling ChangeHeroCenter

Why can I see the last frame with the new position?. How can it be possible if batch drawing line has not been reached yet? It causes a visual glitch.

Informatix · Dec 3, 2015

ivavilagu said:
Hi everyone,

I have two questions

1-I've updated to 1.10 version and I´m not able to draw a lgParticleEffect with the new version. When I try to draw the effect in render event I receive an error. It worked with old version.

B4X:

SnowEffect.Draw2(Batch, DeltaTime) ' java.lang.IllegalArgumentException: sprite cannot be null.

2-I want to animate a character. I have some animations in a sprite sheet. Every animation has different width, so I need to line up the character using a center x variable ( frame_width / 2). Every time I change the animation, I call a function to calculate the new center of the frame and change the x position of the character.

B4X:

Sub LG_Render 'Some extra lines . . . If (Hero.CurrentAnimation.IsAnimationFinished(Hero.StateTime) = True) Then ChangeHeroCenter 'Change the x position of the character ChangeHeroAnimation(0) 'Change the animation of the character End If Batch.DrawRegion2(Hero.frame, Hero.xPOS, Hero.yPOS,Hero.frame.Regionwidth,Hero.frame.RegionHeight) end sub

The problem is with the last frame before I change the animation.

Last frame before calling ChangeHeroCenter

The same frame after calling ChangeHeroCenter

Why can I see the last frame with the new position?. How can it be possible if batch drawing line has not been reached yet? It causes a visual glitch.

1) The error is clearly stated: the sprite cannot be null.
I did not change anything to lgParticleEffect or lgSprite since long.

2) The code that changes the animation and the code that increases the state time are missing so I cannot answer.

Rantor777 · Dec 3, 2015

Hi to All

I am new to this Engine, @Informatix, How good is the Integration with Overlap2D ?

Can I use Overlap2D with your LibGDX Port using B4A ? If YES, Can you Provide an Example, Please .

Regards!

Informatix · Dec 3, 2015

Rantor777 said:
Hi to All

I am new to this Engine, @Informatix, How good is the Integration with Overlap2D ?

Can I use Overlap2D with your LibGDX Port using B4A ? If YES, Can you Provide an Example, Please .

Regards!

Overlap2D is an editor and a runtime library. No one wrapped this library for B4A so Overlap2D is not directly usable, but as the exported files use the JSON format, it should not be complicated to use their contents in your game.

ivavilagu · Dec 3, 2015

Sorry Informatix,

B4X:

Sub LG_Render
'Some extra lines
    .
    .
    .
     If (Hero.CurrentAnimation.IsAnimationFinished(Hero.StateTime) = True) Then                                                                           
                ChangeHeroCenter                'Change the x position of the character
                ChangeHeroAnimation(0)       'Change the animation of the character to idle animation
     End If
     Batch.DrawRegion2(Hero.frame, Hero.xPOS, Hero.yPOS,Hero.frame.Regionwidth,Hero.frame.RegionHeight)
End sub

Sub ChangeHeroAnimation(anim As Int)
    Hero.StateTime = 0                                                                               
    Hero.CurrentAnimation = Hero.Animation(anim)  'Where CurrentAnimation is a lgAnimation and animation() is a lgAnimation array
    If (anim = 0) Then
        Hero.Idle = True                    'Boolean that indicates if hero is in idle position
    Else
        Hero.Idle = False
    End If
End Sub

Sub ChangeHeroCenter
    If (Hero.idle = False) Then    'Hero.CenterX is a constant value from the idle animation ,created when animations are initialized. It means the idle animation frame width / 2
        If (Hero.CenterX < Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2) Then
              Hero.xPOS = Hero.xPOS - Hero.centerx - (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        Else
            Hero.xPOS = Hero.xPOS + Hero.centerx - (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        EndIf
    Else
        If (Hero.CenterX < Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2) Then
            Hero.xPOS = Hero.xPOS + Hero.centerx + (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        Else
            Hero.xPOS = Hero.xPOS - Hero.centerx + (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        EndIf
    EndIf
EndSub

As I said before, I don´t know why the last frame of an animation is shown after calling ChangeHeroCenter if batch.drawregion2 has not been called yet.

Informatix · Dec 3, 2015

ivavilagu said:

Sorry Informatix,

B4X:

Sub LG_Render
'Some extra lines
    .
    .
    .
     If (Hero.CurrentAnimation.IsAnimationFinished(Hero.StateTime) = True) Then                                                                          
                ChangeHeroCenter                'Change the x position of the character
                ChangeHeroAnimation(0)       'Change the animation of the character to idle animation
     End If
     Batch.DrawRegion2(Hero.frame, Hero.xPOS, Hero.yPOS,Hero.frame.Regionwidth,Hero.frame.RegionHeight)
End sub

Sub ChangeHeroAnimation(anim As Int)
    Hero.StateTime = 0                                                                              
    Hero.CurrentAnimation = Hero.Animation(anim)  'Where CurrentAnimation is a lgAnimation and animation() is a lgAnimation array
    If (anim = 0) Then
        Hero.Idle = True                    'Boolean that indicates if hero is in idle position
    Else
        Hero.Idle = False
    End If
End Sub

Sub ChangeHeroCenter
    If (Hero.idle = False) Then    'Hero.CenterX is a constant value from the idle animation ,created when animations are initialized. It means the idle animation frame width / 2
        If (Hero.CenterX < Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2) Then
              Hero.xPOS = Hero.xPOS - Hero.centerx - (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        Else
            Hero.xPOS = Hero.xPOS + Hero.centerx - (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        EndIf
    Else
        If (Hero.CenterX < Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2) Then
            Hero.xPOS = Hero.xPOS + Hero.centerx + (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        Else
            Hero.xPOS = Hero.xPOS - Hero.centerx + (Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime).RegionWidth / 2)
        EndIf
    EndIf
EndSub

As I said before, I don´t know why the last frame of an animation is shown after calling ChangeHeroCenter if batch.drawregion2 has not been called yet.

I don't see any code setting Hero.Frame, which is the frame drawn by DrawRegion2.

ivavilagu · Dec 4, 2015

Informatix said:
I don't see any code setting Hero.Frame, which is the frame drawn by DrawRegion2.

B4X:

Sub LG_Render
    If (Hero.Idle = False) Then
         Hero.Frame = Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime)
         If (Hero.CurrentAnimation.IsAnimationFinished(Hero.StateTime) = True) Then                                                                         
              ChangeHeroCenter                'Change the x position of the character
              ChangeHeroAnimation(0)       'Change the animation of the character to idle animation
         End If
     else
           Hero.frame = Hero.CurrentAnimation.GetKeyFrame2(Hero.StateTime, True) 'Idle animation is in loop mode
     end if
     Batch.DrawRegion2(Hero.frame, Hero.xPOS, Hero.yPOS,Hero.frame.Regionwidth,Hero.frame.RegionHeight)
End sub

Informatix · Dec 4, 2015

ivavilagu said:

B4X:

Sub LG_Render
    If (Hero.Idle = False) Then
         Hero.Frame = Hero.CurrentAnimation.GetKeyFrame(Hero.StateTime)
         If (Hero.CurrentAnimation.IsAnimationFinished(Hero.StateTime) = True) Then                                                                        
              ChangeHeroCenter                'Change the x position of the character
              ChangeHeroAnimation(0)       'Change the animation of the character to idle animation
         End If
     else
           Hero.frame = Hero.CurrentAnimation.GetKeyFrame2(Hero.StateTime, True) 'Idle animation is in loop mode
     end if
     Batch.DrawRegion2(Hero.frame, Hero.xPOS, Hero.yPOS,Hero.frame.Regionwidth,Hero.frame.RegionHeight)
End sub

The explanation is in the code above. When you change the animation, you don't update Hero.Frame.

ivavilagu · Dec 4, 2015

Informatix said:
The explanation is in the code above. When you change the animation, you don't update Hero.Frame.

Ups!!!! What a mistake!

Thanks Informatix, it´s work fine now

I´m still fighting with lgParticle. I don´t know why does´t work with the new library version

Initializing the effect at start of app

B4X:

SnowEffect.Initialize                                                            
SnowEffect.load(lGdx.Files.internal("effects/snow"), lGdx.Files.internal("effects"))
SnowEffect.SetPosition(poly.Polyline.X * UnitScale, UpLimit * UnitScale)
SnowEffect.Start

The next line is between batch.begin and batch.end. I don´t know why batch is null. At the moment I only use batch in one line to draw hero.frame as you see in last post

B4X:

SnowEffect.Draw2(Batch, lGdx.Graphics.DeltaTime)

If I change the line the error disappear (obviously the effect cannot display)

B4X:

SnowEffect.Draw(Batch)

I try to log Batch content

B4X:

If (Batch <> Null ) Then
      Log("yes")
 End If
SnowEffect.Draw2(Batch,lGdx.Graphics.DeltaTime)

Surprisingly Batch is not null according log window

Informatix · Dec 4, 2015

ivavilagu said:
Ups!!!! What a mistake!

Thanks Informatix, it´s work fine now

I´m still fighting with lgParticle. I don´t know why does´t work with the new library version

Initializing the effect at start of app

B4X:

SnowEffect.Initialize SnowEffect.load(lGdx.Files.internal("effects/snow"), lGdx.Files.internal("effects")) SnowEffect.SetPosition(poly.Polyline.X * UnitScale, UpLimit * UnitScale) SnowEffect.Start

The next line is between batch.begin and batch.end. I don´t know why batch is null. At the moment I only use batch in one line to draw hero.frame as you see in last post

B4X:

SnowEffect.Draw2(Batch, lGdx.Graphics.DeltaTime)

If I change the line the error disappear (obviously the effect cannot display)

B4X:

SnowEffect.Draw(Batch)

I try to log Batch content

B4X:

If (Batch <> Null ) Then Log("yes") End If SnowEffect.Draw2(Batch,lGdx.Graphics.DeltaTime)

Surprisingly Batch is not null according log window

It's not Batch that is null, it's the sprite drawn. Are you sure that all images are loaded and ready to use?
You should try your effect and images with the Particles demo of the library.

ivavilagu · Dec 4, 2015

Informatix said:
It's not Batch that is null, it's the sprite drawn. Are you sure that all images are loaded and ready to use?
You should try your effect and images with the Particles demo of the library.

The effect worked well until upgrade the library, I had been using 1.04 version. This is the reason I though the problem was the update. I will check path and files but it's all very strange. Maybe it's a deltatime problem.

Rantor777 · Jan 4, 2016

How to use Skins with LibGDX (Without INLINE JAVA) ?

PHP:

private void createBasicSkin(){
  //Create a font
  BitmapFont font = new BitmapFont();
  skin = new Skin();
  skin.add("default", font);
  //Create a texture
  Pixmap pixmap = new Pixmap((int)Gdx.graphics.getWidth()/4,(int)Gdx.graphics.getHeight()/10, Pixmap.Format.RGB888);
  pixmap.setColor(Color.WHITE);
  pixmap.fill();
  skin.add("background",new Texture(pixmap));
  //Create a button style
  TextButton.TextButtonStyle textButtonStyle = new TextButton.TextButtonStyle();
  textButtonStyle.up = skin.newDrawable("background", Color.GRAY);
  textButtonStyle.down = skin.newDrawable("background", Color.DARK_GRAY);
  textButtonStyle.checked = skin.newDrawable("background", Color.DARK_GRAY);
  textButtonStyle.over = skin.newDrawable("background", Color.LIGHT_GRAY);
  textButtonStyle.font = skin.getFont("default");
  skin.add("default", textButtonStyle);
}

Informatix · Jan 4, 2016

Rantor777 said:

How to use Skins with LibGDX (Without INLINE JAVA) ?

PHP:

private void createBasicSkin(){
  //Create a font
  BitmapFont font = new BitmapFont();
  skin = new Skin();
  skin.add("default", font);
  //Create a texture
  Pixmap pixmap = new Pixmap((int)Gdx.graphics.getWidth()/4,(int)Gdx.graphics.getHeight()/10, Pixmap.Format.RGB888);
  pixmap.setColor(Color.WHITE);
  pixmap.fill();
  skin.add("background",new Texture(pixmap));
  //Create a button style
  TextButton.TextButtonStyle textButtonStyle = new TextButton.TextButtonStyle();
  textButtonStyle.up = skin.newDrawable("background", Color.GRAY);
  textButtonStyle.down = skin.newDrawable("background", Color.DARK_GRAY);
  textButtonStyle.checked = skin.newDrawable("background", Color.DARK_GRAY);
  textButtonStyle.over = skin.newDrawable("background", Color.LIGHT_GRAY);
  textButtonStyle.font = skin.getFont("default");
  skin.add("default", textButtonStyle);
}

You cannot use skins. I ignored this feature. Never understood the real interest of it.

ilan · Mar 3, 2016

hi

i have a probelm with a revolutejoint

i made a circle and a box and i connect them with a revolutejoint. i set the revolutejointdef and create it with World.CreateJoint(RevoluteJointDef)
everything is perfect until now.
i also set the RevoluteJointDef properties (motorspeed, maxMotorTorque,...) when i create my 2 bodies and the joint i set the enableMotor to false

now i would like to turn it on when i press on a button so i have to create a reference to the created joint and i do it like this

in globals i write:

B4X:

Dim vehicle_motor As lgBox2DRevoluteJoint

now when i create the bodies and the joint i write:

B4X:

vehicle_motor = World.CreateJoint(RevoluteJointDef)

but this gives me an error. turning on the motor when i create the joint works but i want to control it after creating the joint.

B4A version: 5.80
Parsing code. (0.01s)
Compiling code. (0.03s)
Compiling layouts code. (0.00s)
Generating R file. (0.15s)
Compiling generated Java code. Error
B4A line: 56
Dim vehicle_motor As lgBox2DRevoluteJoint
javac 1.7.0_45
src\flm\b4a\lgdxtest\main.java:882: error: constructor RevoluteJoint in class RevoluteJoint cannot be applied to given types;
mostCurrent._vehicle_motor = new com.badlogic.gdx.physics.box2d.joints.RevoluteJoint();
^
required: World,long
found: no arguments
reason: actual and formal argument lists differ in length
1 error

Click to expand...

how can i do it??

thank you

Solved it

wonder · Jun 27, 2016

A few quick questions:

1. How to exit a LibGDX based app? Activity.Finish or ExitApplication?
2. Should I pause LibGDX before exiting?
3. Should I manually call LG_Dispose before exiting?

Thanks in advance!

Informatix · Jun 28, 2016

wonder said:
A few quick questions:

1. How to exit a LibGDX based app? Activity.Finish or ExitApplication?
2. Should I pause LibGDX before exiting?
3. Should I manually call LG_Dispose before exiting?

Thanks in advance!

1) Activity.Finish. It's not different from other apps.
2) No. Why?
3) No. It is automatically called. Look at the life-cycle in the libGDX introduction guide.

ilan · Jun 28, 2016

in my opinion activity.finish should be called when user want to exit the game and not on Home Button click or incoming call...

i put a menu inside the game and when the user want to exit he need to confirm that.

so i dont put Activity.finish in Activity_Pause

wonder · Jun 28, 2016

@Informatix, thank you! Understood.

@ilan, in the final product yes, I totally agree with you.
For now, I want to use the Home button as the exit point.

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