In article <1167422952.538215.48450@48g2000cwx.googlegroups.com>, 
"noone@nowhere.undef" <s.celles@gmail.com> writes
>
>> Most GUI's are going to be far too big.
>
>Yes that's the problem...
>
>
>> Make it modular (use C)
>
>This is quite difficult to do it because the problem of GUI is quite
>difficult

Several of the commercial high integrity graphics Libraries I supply are 
written in C.

>> This will be a useful project as a
>> teacher and you can get the students to add components to the system.
>
>I'm not a computer science teacher... I only do it as a hobby ;-)
>
You said you teach physics. I am sure that software cones into that 
somewhere. Don't be so narrow.  You could of course work with the Cs 
teacher on a cross-subject project.  That's what we have t do in the 
real world.

-- 
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
\/\/\/\/\ Chris Hills  Staffs  England     /\/\/\/\/
/\/\/ chris@phaedsys.org      www.phaedsys.org \/\/\
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

the lib should also be able to manage focus on widget.

The focus change on key press

The lib should also contain a text widget
(usable only with directional key)

> My spelling was not even close, try
> http://en.wikipedia.org/wiki/Bresenham's_line_algorithm

Thanks for this but my problem is not about
drawing lines it is about drawing widgets,
managing event like in other GUI (GTK+, QT, FLTK...)

emWin or PEG or PEG+ can do it but I would like a free (an open source)
lib for this

Regards

> You should check out. eZLCD at www.earthlcd.com
> http://www.crystalfontz.com/products/index-grph.html
> Is another good place to look for display modules.

I also know

http://www.display3000.com
http://www.matrixorbital.com

but that's not the problem.

The problem is not about
drawing lines, drawing text...

The problem is about making a true GUI
like emWin PEG
(have a look at my other posts)

Regards

> Most GUI's are going to be far too big.

Yes that's the problem...


> Make it modular (use C)

This is quite difficult to do it because the problem of GUI is quite
difficult
I must think to make possible to use callback function for managing
events
(like in GTK+)
I had a look at the GTK+ but that's very difficult for me to understand
it...

> This will be a useful project as a
> teacher and you can get the students to add components to the system.

I'm not a computer science teacher... I only do it as a hobby ;-)

> if u plan to use a graphical LCD, it'll have it's own frame buffer
> where u can write the image. The lcd will take care of displaying it.

Yes I agree with you
I can get a driver for the controller of a LCD...
That's not the problem...

The problem is not about drawing "primitive" function such as drawing
lines, or text...
It's ever done

In fact the problem is to have a minimal GUI with **widgets**.

There is some commercial lib for this
See for example :

http://www.celles.net/wikini/wakka.php?wiki=3DGUIEmbarque
 GUI pour d'autres OS embarqu=E9s
 GUI pour d'autres OS embarqu=E9s
Biblioth=E8ques LCD (haut niveau)

PEG emWin ...

For example such a lib could contain callback function for managing
event

machinamentum@gmail.com wrote:

> You can find 'C' source for bresham's line drawing algorithim as well
> as any other graphical algorithim you'll need on the net. Your only
> real hurdle is finding suitable LCD panel and others have made some
> good suggestions.
>
> Good Luck.
>
> Chris


My spelling was not even close, try

http://en.wikipedia.org/wiki/Bresenham's_line_algorithm

noone@nowhere.undef wrote:
> Hello,
>
> I'm just an electronic hobbyist (and physic teacher).
> I'd like to make a sort of chronometer for my Go-Kart.
> It's working fine now
> (using WinAVR as C compiler
> for a microcontroller (uC) ATMEL AVR ATmega8535)
> but I use a character LCD display.
>
> I would like to use a graphical LCD now.
> But I also would like to have some widgets (like in GTK)
> Unfortunately I don't know if it is possible to do it without a minimal
> Linux
> on the uC (I'm also fond of open source softwares and Linux... of
> course)
> I guess that having a Linux kernel is too much for a little 8 bits uC
> like ATMEL AVR.
> I hope you could help me for this.
>
>
> Regards

As youve indicated the 8535 has a 8 bit MPU with 8Kb of flash and 512
bytes of RAM, so running the Linux kernel, a X windows client-server as
well as apps is out of the question. Even if this hardware was more
capable and a kernel port was already available, running embedded Linux
to implement a graphical timer would be over kill. Embedded Linux
shines in a number of area's especially in devices where network
support is needed.

You can find 'C' source for bresham's line drawing algorithim as well
as any other graphical algorithim you'll need on the net. Your only
real hurdle is finding suitable LCD panel and others have made some
good suggestions.

Good Luck.

Chris

You should check out. eZLCD at www.earthlcd.com

It is a display module that would accept serial commands from the AVR.
If this is a protoype (i.e. your only going to build a few) this would
be the way to go. Unless you want the challege of writing your own
display driver and have some comercial possibilities for your project.

The eZLCD isn't very cheap, $150 in single peices.

Noritake also has some very cool VFD serial graphical modules, but
again they are spendy.

http://www.crystalfontz.com/products/index-grph.html

Is another good place to look for display modules.


ERIC

You should check out. eZLCD at www.earthlcd.com

It is a display module that would accept serial commands from the AVR.
If this is a protoype (i.e. your only going to build a few) this would
be the way to go. Unless you want the challege of writing your own
display driver and have some comercial possibilities for your project.

The eZLCD isn't very cheap, $150 in single peices.

Noritake also has some very cool VFD serial graphical modules, but
again they are spendy.

http://www.crystalfontz.com/products/index-grph.html

Is another good place to look for display modules.


ERIC