B4A Library libGDX - Game Engine

TheJinJ · Jan 19, 2015

Managed to get this to work for a body, I made a silly mistake by passing the userdata after createfixture as per most examples on the web. Doc says that body.userdata is for getting the data.

B4X:

For i = 0 To 3
    bodyDef.position.Set(Rnd(-10, 10), Rnd(-10, 10))
    bodya(i) = world.CreateBody(bodyDef)
    bodya(i).UserData = image0
    bodya(i).createFixture(fixtureDef) '.UserData = image0
    bvec2 = bodya(i).Position
    image0.SetBounds(bvec2.x - (aspect_ratio * scale) / 2, bvec2.y - scale / 2,  aspect_ratio * scale , scale) ' x y w h
Next

Then in spritebatch....

B4X:

    sb.Begin
        For i = 0 To 3
            bvec2 = bodya(i).Position
            tmpimg = bodya(i).UserData
            tmpimg.setPosition(bvec2.x - tmpimg.Width /2, bvec2.y - tmpimg.Height /2)
            tmpimg.SetOriginCenter
            tmpimg.Rotation = bodya(i).Angle * lgmu.radiansToDegrees
            tmpimg.Draw(sb)
        Next
    sb.End

Informatix · Jan 19, 2015

TheJinJ said:

Managed to get this to work for a body, I made a silly mistake by passing the userdata after createfixture as per most examples on the web. Doc says that body.userdata is for getting the data.

B4X:

For i = 0 To 3
    bodyDef.position.Set(Rnd(-10, 10), Rnd(-10, 10))
    bodya(i) = world.CreateBody(bodyDef)
    bodya(i).UserData = image0
    bodya(i).createFixture(fixtureDef) '.UserData = image0
    bvec2 = bodya(i).Position
    image0.SetBounds(bvec2.x - (aspect_ratio * scale) / 2, bvec2.y - scale / 2,  aspect_ratio * scale , scale) ' x y w h
Next

Then in spritebatch....

B4X:

    sb.Begin
        For i = 0 To 3
            bvec2 = bodya(i).Position
            tmpimg = bodya(i).UserData
            tmpimg.setPosition(bvec2.x - tmpimg.Width /2, bvec2.y - tmpimg.Height /2)
            tmpimg.SetOriginCenter
            tmpimg.Rotation = bodya(i).Angle * lgmu.radiansToDegrees
            tmpimg.Draw(sb)
        Next
    sb.End

Yes, I saw there's a little mistake in the doc. It should say: "get or set..."

TheJinJ · Jan 19, 2015

Informatix said:
Yes, I saw there's a little mistake in the doc. It should say: "get or set..."

Is it an error that it doesn't set if passed after creatfixture?

Informatix · Jan 19, 2015

TheJinJ said:
Is it an error that it doesn't set if passed after creatfixture?

I do not see any difference if I set UserData before or after CreateFixture. Could you send me your example? I'm unable to reproduce your error.

TheJinJ · Jan 20, 2015

If you pass an object after createfixture it doesn't work but if you pass a string it does. Passing userdata directly from body works for both.

Informatix · Jan 20, 2015

TheJinJ said:
If you pass an object after createfixture it doesn't work but if you pass a string it does. Passing userdata directly from body works for both.

Could you post a project that replicates this issue?

TheJinJ · Jan 20, 2015

I'm not at a PC but a thought, does user data after createfixture set userdata on the fixture, not the body?

Informatix · Jan 20, 2015

TheJinJ said:
I'm not at a PC but a thought, does user data after createfixture set userdata on the fixture, not the body?

CreateFixture initializes a new fixture so, after calling it, the UserData property of the fixture is Null. But that concerns only the property of this class, not the UserData property of your body. There's no relation between these two properties. UserData is exactly like Tag for your other views. Nothing sets its value except you.

TheJinJ · Jan 20, 2015

It seems that body.userdata is for the body, passing after createfixture sets it for the fixture, tested with contact listeners retrieving the body userdata and the fixture separately.

B4X:

For i = 0 To 1
    bodyDef.position.Set(Rnd(-10, 10), Rnd(-10, 100))
    bodya(i) = world.CreateBody(bodyDef)
    bd_data.sprite = image0
    bd_data.bname = "Sprite_Can" & i
    bodya(i).UserData = bd_data
    bodya(i).createFixture(fixtureDef).UserData = "Object"
    bvec2 = bodya(i).Position
    image0.SetBounds(bvec2.x - (aspect_ratio * scale) / 2, bvec2.y - scale / 2,  aspect_ratio * scale , scale) ' x y w h
Next

B4X:

    fa = Contact.FixtureA
    fb = Contact.FixtureB
      
    If fa.UserData <> Null Then
   
        Select fa.UserData
            Case "Ground"
                Log("FA: " & fa.UserData)
            Case "Object"
                Log("FA: " & fa.UserData)

Informatix · Jan 20, 2015

TheJinJ said:
It seems that body.userdata is for the body, passing after createfixture sets it for the fixture, tested with contact listeners retrieving the body userdata and the fixture seperately.

???
When you set Body.UserData, it's for the body and nothing else, whatever may be the place where you set it. CreateFixture does not change this property and has no reason to do so.

TheJinJ · Jan 20, 2015

EDIT
So the createfixture.userdata is for the fixture....got it now. I was confused initially where I thought only the body could hold userdata and that using createfixture.userdata was just chained onto body thus setting it's property....
Thanks for your help

RichyK68 · Jan 27, 2015

Informatix said:
Read carefully your error message. It indicates that it doesn't like the UTF8 sequence before "<?xml" ("Error parsing XML on line 1 near..."). This is typical of files edited by hand. Open this file with the notepad and save it with an ASCII encoding.
As the tIDE implementation in libGDX is buggy, I recommend to use TMX files instead (created with Tiled for example).

Hi, I'm trying to load a tmx file saved from Tiled Map Editor, it is called map_1.tmx and it's located in the assets folder of my app.

B4X:

    Dim loader As lgMapTmxMapLoader
    CurrentMap = loader.Initialize2("map_1.tmx")

The file is definitely there, but I get the same errors (below) whether I feed it the correct name of the file or a file that doesn't even exist, which leads me to believe it can't even see it.

Does anybody have any ideas why?

Error occurred on line: 725 (main)
com.badlogic.gdx.utils.SerializationException: Error parsing file: map_1.tmx
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:83)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:122)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:110)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Load(SourceFile:32)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Initialize2(SourceFile:21)
at richkidsoftware.platform.main._lg_create(main.java:2550)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at anywheresoftware.b4a.ShellBA$1.run(ShellBA.java:66)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5105)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Error reading file: map_1.tmx (Internal)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:76)
at com.badlogic.gdx.files.FileHandle.reader(SourceFile:187)
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:81)
... 23 more
Caused by: java.io.FileNotFoundException: map_1.tmx
at android.content.res.AssetManager.openAsset(Native Method)
at android.content.res.AssetManager.open(AssetManager.java:323)
at android.content.res.AssetManager.open(AssetManager.java:297)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:74)
... 25 more
** Activity (main) Resume **

Informatix · Jan 27, 2015

RichyK68 said:
Hi, I'm trying to load a tmx file saved from Tiled Map Editor, it is called map_1.tmx and it's located in the assets folder of my app.

B4X:

Dim loader As lgMapTmxMapLoader CurrentMap = loader.Initialize2("map_1.tmx")

The file is definitely there, but I get the same errors (below) whether I feed it the correct name of the file or a file that doesn't even exist, which leads me to believe it can't even see it.

Does anybody have any ideas why?

Error occurred on line: 725 (main)
com.badlogic.gdx.utils.SerializationException: Error parsing file: map_1.tmx
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:83)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:122)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:110)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Load(SourceFile:32)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Initialize2(SourceFile:21)
at richkidsoftware.platform.main._lg_create(main.java:2550)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at anywheresoftware.b4a.ShellBA$1.run(ShellBA.java:66)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5105)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Error reading file: map_1.tmx (Internal)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:76)
at com.badlogic.gdx.files.FileHandle.reader(SourceFile:187)
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:81)
... 23 more
Caused by: java.io.FileNotFoundException: map_1.tmx
at android.content.res.AssetManager.openAsset(Native Method)
at android.content.res.AssetManager.open(AssetManager.java:323)
at android.content.res.AssetManager.open(AssetManager.java:297)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:74)
... 25 more
** Activity (main) Resume **

Could you post the TMX file?

TheJinJ · Jan 27, 2015

FileNotFoundException: map_1.tmx

I think you need to specify the internal directory where the file is located

RichyK68 said:
Hi, I'm trying to load a tmx file saved from Tiled Map Editor, it is called map_1.tmx and it's located in the assets folder of my app.

B4X:

Dim loader As lgMapTmxMapLoader CurrentMap = loader.Initialize2("map_1.tmx")

The file is definitely there, but I get the same errors (below) whether I feed it the correct name of the file or a file that doesn't even exist, which leads me to believe it can't even see it.

Does anybody have any ideas why?

Error occurred on line: 725 (main)
com.badlogic.gdx.utils.SerializationException: Error parsing file: map_1.tmx
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:83)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:122)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:110)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Load(SourceFile:32)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Initialize2(SourceFile:21)
at richkidsoftware.platform.main._lg_create(main.java:2550)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at anywheresoftware.b4a.ShellBA$1.run(ShellBA.java:66)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5105)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Error reading file: map_1.tmx (Internal)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:76)
at com.badlogic.gdx.files.FileHandle.reader(SourceFile:187)
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:81)
... 23 more
Caused by: java.io.FileNotFoundException: map_1.tmx
at android.content.res.AssetManager.openAsset(Native Method)
at android.content.res.AssetManager.open(AssetManager.java:323)
at android.content.res.AssetManager.open(AssetManager.java:297)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:74)
... 25 more
** Activity (main) Resume **

RichyK68 · Jan 27, 2015

Thanks for the quick replies. I've also tried

B4X:

CurrentMap = loader.Initialize2(lGdx.Files.internal("map_1.tmx"))

which is the technique used for texture loading, but this didn't work either. I'll post the tmx file, there's also a tsx and a png.

RichyK68 · Jan 27, 2015

Here are the three files that exist in my assets folder (located in the files folder of my B4A project).

Informatix · Jan 27, 2015

RichyK68 said:
Here are the three files that exist in my assets folder (located in the files folder of my B4A project).

Your map uses a TSX file which is not supported. Don't use external tilesets.

RichyK68 · Jan 27, 2015

Yeah that was my second attempt, the first one fails with the errors (below). My first attempt doesn't use the tsx only a png.

Timeline: Activity_launch_request id:richkidsoftware.platform time:180088926
** Activity (main) Pause, UserClosed = false **
showStatusIcon on inactive InputConnection
** Activity (main) Create, isFirst = true **
java.lang.NullPointerException
java.lang.NullPointerException
** Activity (main) Resume **
sensor listener setup
OGL renderer: Adreno (TM) 330
OGL vendor: Qualcomm
OGL version: OpenGL ES 3.0 V@66.0 AU@ (CL@)
OGL extensions: GL_AMD_compressed_ATC_texture GL_AMD_performance_monitor GL_AMD_program_binary_Z400 GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_robustness GL_EXT_texture_format_BGRA8888 GL_EXT_texture_type_2_10_10_10_REV GL_NV_fence GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth_texture GL_OES_depth24 GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_fragment_precision_high GL_OES_get_program_binary GL_OES_packed_depth_stencil GL_OES_depth_texture_cube_map GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_texture_3D GL_OES_texture_float GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_half_float GL_OES_vertex_type_10_10_10_2 GL_OES_vertex_array_object GL_QCOM_alpha_test GL_QCOM_binning_control GL_QCOM_driver_control GL_QCOM_perfmon_global_mode GL_QCOM_extended_get GL_QCOM_extended_get2 GL_QCOM_tiled_rendering GL_QCOM_writeonly_rendering GL_EXT_sRGB GL_EXT_sRGB_write_control GL_EXT_texture_sRGB_decode GL_EXT_texture_filter_anisotropic GL_EXT_multisampled_render_to_texture GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_disjoint_timer_query
framebuffer: (5, 6, 5, 0)
depthbuffer: (16)
stencilbuffer: (0)
samples: (0)
coverage sampling: (false)
Managed meshes/app: { }
Managed textures/app: { }
Managed shaders/app: { }
Managed buffers/app: { }
Error occurred on line: 725 (main)
com.badlogic.gdx.utils.SerializationException: Error parsing file: map_1.tmx
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:83)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:122)
at com.badlogic.gdx.maps.tiled.TmxMapLoader.load(SourceFile:110)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Load(SourceFile:32)
at anywheresoftware.b4a.libgdx.maps.lgTmxMapLoader.Initialize2(SourceFile:21)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at anywheresoftware.b4a.ShellBA$1.run(ShellBA.java:66)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5105)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Error reading file: map_1.tmx (Internal)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:76)
at com.badlogic.gdx.files.FileHandle.reader(SourceFile:187)
at com.badlogic.gdx.utils.XmlReader.parse(SourceFile:81)
... 22 more
Caused by: java.io.FileNotFoundException: map_1.tmx
at android.content.res.AssetManager.openAsset(Native Method)
at android.content.res.AssetManager.open(AssetManager.java:323)
at android.content.res.AssetManager.open(AssetManager.java:297)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(SourceFile:74)
... 24 more
** Activity (main) Resume **
Timeline: Activity_idle id: android.os.BinderProxy@428c2340 time:180092460

RichyK68 · Jan 27, 2015

Here are the two files that fail.

Informatix · Jan 27, 2015

RichyK68 said:
Here are the two files that fail.

It seems that the new version of Tiled Map Editor produces incompatible files. Try an older release (available in Daily builds).
I don't have time these days to update the TMX loader so don't except a new version of libGDX.

B4A Library libGDX - Game Engine

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