iLiad ANNOUNCE: Lua5.1 package for Iliad - Page 6

Iñigo · 10-30-2009, 07:44 AM

Quote:

Originally Posted by ericshliao

One question:
How to operate with GTK, GDK...function in Lua script? I know that there is a dir "examples" in lgob and I can learn a lot by imitating the examples. But, where is the manual (not the officail GTK documentation)?

There isn't any.
Study those examples and take also a look at hansel's and my own's programs: multicalc, minipad, toolbox...[*]

I usually check pygtk docs and programs too and then translate to lua. Though is not directly translatable it should point you in the proper direction. Note that callbacks send arguments in a different way.

Iñigo
[*] Hansel lua code is quite polished and pretty, mine is ugly 'cos I don't know lua much.

ericshliao · 10-30-2009, 08:45 AM

Well, I can live without a manual.
Just wrote a image viewer running on iLiad in 15 lines of lua script. And the speed is quite fast. Really amazing.
In fact, lgob provides operation with ATK, CAIRO, PANGO, GDK ,GTK in lua script.
I guess I can turn my homebrew application written in over one thousand lines of C code to 200 lines of lua script.

Iñigo · 10-30-2009, 09:04 AM

Quote:

Originally Posted by ericshliao

Well, I can live without a manual.
Just wrote a image viewer running on iLiad in 15 lines of lua script. And the speed is quite fast. Really amazing.
In fact, lgob provides operation with ATK, CAIRO, PANGO, GDK ,GTK in lua script.
I guess I can turn my homebrew application written in over one thousand lines of C code to 200 lines of lua script.

Good!

note however that some recent pango/gtk/... functions are not available on Iliad.
I consult pygtk docs to find out which they are.

I have just joined #iliad in irc.freenode.net if you want realtime chat ;-)

Iñigo

ericshliao · 10-30-2009, 12:30 PM

Iñigo,
thanx. I need some time to adapt to the way to call GTK+ function in lua.
This is a image viewer written in lua. Users can open file dialog to choose a image file to open. Unpack to anywhere and execute from Contentlister.

hansel · 10-30-2009, 01:07 PM

Quote:

Originally Posted by ericshliao

Well, I can live without a manual.

The official gtk docs are quite good.

The Lua api is almost identical to the C api if you replace the underscores with dots, and capitalize here and there

Pay special attention where it mentions 'available since...' If its old enough, it will work on the Iliad. The Iliad versions are

GOBJECT=2.6.6
GDK=2.6.7
PANGO=1.8.1
GTK=2.6.7

Great to see your enthusiasm!
Happy coding,
Hansel

Iñigo · 10-30-2009, 02:03 PM

Does anyone know why this code does not work?

Code:

btn:connect("clicked", function ()
                              win:hide()
                              win:destroy()
                              os.execute("/sbin/poweroff")
                           end)

If I substitute "/bin/poweroff" with "/sbin/fconfig" it prints ifconfig output on the terminal, so I'm pretty sure callback is correctly called.

I've also checked with "shutdown -t 0 now".
No way to switch off the Iliad from inside a lua+lgob program.

Thanks,
Iñigo

hansel · 10-30-2009, 02:04 PM

Quote:

Originally Posted by Iñigo

In my dreams, we should have a lua module for all this stuff...

I'll do that some day (if you don't beat me at it

)... Basically it's not difficult: a Lua wrapper for liberipc/eripcclient would provide most functions...

hansel · 10-30-2009, 02:11 PM

Quote:

Originally Posted by Iñigo

Does anyone know why this code does not work?

Maybe because it's a symbolic link? try /sbin/halt.sysvinit (not sure, just guessing, untested)

Iñigo · 10-30-2009, 02:43 PM

Quote:

Originally Posted by hansel

Maybe because it's a symbolic link? try /sbin/halt.sysvinit (not sure, just guessing, untested)

That didn't work either.
It's strange because /sbin/reboot works, and it's a link in fact.

Anyway, I've found a command that can shutdown the Iliad "/sbin/shutdown.sysvinit -h -P now"!

I'll study it a bit more...

Thanks,
Iñigo

ericshliao · 10-31-2009, 08:50 AM

I have a question:
Can I access gdk_gc_new() (http://library.gnome.org/devel/gdk/s...-Contexts.html) in lua script through lgob?

I want to use some GDK drawing primitives (http://library.gnome.org/devel/gdk/2...rimitives.html), and some functions need GdkGC parameter.

Added:
I figured it out. It's gdk.GC.new().

ericshliao · 10-31-2009, 09:40 AM

Another question:
I want to access some function, such as pango_matrix_rotate() (http://library.gnome.org/devel/pango...h-Storage.html). I have tried several times with no success. How do I know if certain function can be access through lgob, and in what form?

Added:
It seems the correct form is pango.Matrix.rotate().

Iñigo · 10-31-2009, 10:23 AM

Quote:

Originally Posted by ericshliao

Another question:
I want to access some function, such as pango_matrix_rotate() (http://library.gnome.org/devel/pango...h-Storage.html). I have tried several times with no success. How do I know if certain function can be access through lgob, and in what form?

Added:
It seems the correct form is pango.Matrix.rotate().

Same happens to me from time to time.
What I do is grep lgob sources for the function I need. Look at the .def, .ovr, and iface.c files.

Also, note that the translation from C to lua is almost always done in this way:

module_widget_method => module.Widget.method

so pango_matrix_rotate() => pango.Matrix.rotate()

Btw, instead of using GDK drawing primitives, maybe is a better option to use Cairo, it's much powerful, easier and looks it has better documentation as well.
You can find 3 or 4 examples in lgob sources too.

Regards,
Iñigo

ericshliao · 10-31-2009, 11:08 AM

Another question:
I have a line of C code "PangoMatrix matrix = PANGO_MATRIX_INIT;" (http://library.gnome.org/devel/pango...h-Storage.html) and I want to convert it to Lua. The line will create a struct consisting 6 double variables.

I tried with "p_matrix = pango.PANGO_MATRIX_INIT". Lua interpretor did accept the form, but in fact p_matrix is still "nil". How do I solve the problem?

Added:
There seems a convenient utility: toLua (http://www.tecgraf.puc-rio.br/~celes/tolua/). But I can't build it on my Linux desktop.

Added 2:
I can build toLua now, but it seems not what I want.

Added 3:
Problem solved. The correct form is "p_matrix = pango.Matrix.INIT".

Added 4:
I am wrong. "p_matrix = pango.Matrix.INIT" is not correct.

hansel · 10-31-2009, 12:10 PM

Quote:

Originally Posted by ericshliao

Another question: How do I know if certain function can be access through lgob, and in what form?(

A cool tool is the Navigator example in the lgob distro: you can load any Lua module (such as lgob.gdk), and view al functions and constants that are in i

I also wrote a function 'pr()' (included in MiniPad.tgz), which recursively prints any Lua variable. The top table in Lua is '_G'. So if you load some modules with require, and then do pr(_G), it will show you all variables (including all known modules and functions)

Happy Lua!

hansel · 10-31-2009, 12:14 PM

This is becoming a top thread: 6th if you sort by nr of replies

It even beats the battery hack thread

10-30-2009, 02:03 PM	#81
Iñigo Guru Posts: 730 Karma: 72743 Join Date: Feb 2008 Location: Here or there Device: iRex iLiad, iRex DR800S. K4NT. Kobo Aura, Aura One, Libra 2.	Help: call to poweroff doesn't work inside lgob callback Does anyone know why this code does not work? Code: btn:connect("clicked", function () win:hide() win:destroy() os.execute("/sbin/poweroff") end) If I substitute "/bin/poweroff" with "/sbin/fconfig" it prints ifconfig output on the terminal, so I'm pretty sure callback is correctly called. I've also checked with "shutdown -t 0 now". No way to switch off the Iliad from inside a lua+lgob program. Thanks, Iñigo

10-31-2009, 08:50 AM	#85
ericshliao Guru Posts: 976 Karma: 687 Join Date: Nov 2007 Device: Dell X51v; iLiad v2	I have a question: Can I access gdk_gc_new() (http://library.gnome.org/devel/gdk/s...-Contexts.html) in lua script through lgob? I want to use some GDK drawing primitives (http://library.gnome.org/devel/gdk/2...rimitives.html), and some functions need GdkGC parameter. Added: I figured it out. It's gdk.GC.new(). Last edited by ericshliao; 10-31-2009 at 09:23 AM.

10-31-2009, 09:40 AM	#86
ericshliao Guru Posts: 976 Karma: 687 Join Date: Nov 2007 Device: Dell X51v; iLiad v2	Another question: I want to access some function, such as pango_matrix_rotate() (http://library.gnome.org/devel/pango...h-Storage.html). I have tried several times with no success. How do I know if certain function can be access through lgob, and in what form? Added: It seems the correct form is pango.Matrix.rotate(). Last edited by ericshliao; 10-31-2009 at 09:47 AM.

10-31-2009, 11:08 AM	#88
ericshliao Guru Posts: 976 Karma: 687 Join Date: Nov 2007 Device: Dell X51v; iLiad v2	Another question: I have a line of C code "PangoMatrix matrix = PANGO_MATRIX_INIT;" (http://library.gnome.org/devel/pango...h-Storage.html) and I want to convert it to Lua. The line will create a struct consisting 6 double variables. I tried with "p_matrix = pango.PANGO_MATRIX_INIT". Lua interpretor did accept the form, but in fact p_matrix is still "nil". How do I solve the problem? Added: There seems a convenient utility: toLua (http://www.tecgraf.puc-rio.br/~celes/tolua/). But I can't build it on my Linux desktop. Added 2: I can build toLua now, but it seems not what I want. Added 3: Problem solved. The correct form is "p_matrix = pango.Matrix.INIT". Added 4: I am wrong. "p_matrix = pango.Matrix.INIT" is not correct. Last edited by ericshliao; 10-31-2009 at 01:17 PM.

10-31-2009, 12:14 PM	#90
hansel JSR FFD2 Posts: 305 Karma: 1045 Join Date: Aug 2008 Location: Rotterdam, Netherlands, Europe, Sol 3 Device: iliad	SPAM This is becoming a top thread: 6th if you sort by nr of replies It even beats the battery hack thread

10-30-2009, 08:45 AM	#77
ericshliao Guru Posts: 976 Karma: 687 Join Date: Nov 2007 Device: Dell X51v; iLiad v2	Well, I can live without a manual. Just wrote a image viewer running on iLiad in 15 lines of lua script. And the speed is quite fast. Really amazing. In fact, lgob provides operation with ATK, CAIRO, PANGO, GDK ,GTK in lua script. I guess I can turn my homebrew application written in over one thousand lines of C code to 200 lines of lua script.

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