Programming in linux

Ringo,

For the simple, output only displays I have done so far (strip charts, logic
displays, and XY plots), I just use Xlib calls.  When I actually get around to
implementing control screens, I guess I will have to learn a widget library.

Jeff.


--
Jeff Shirley
spam-crepe@mindspring.com
"Bill Gates is filthy rich, but that doesn't mean I want to be married to him."

: the graphics in linux. I'm looking into using GTK since it looks easy
: enough to add buttons and other widgets to my existing C code. Has
: anyone done any mapping in C in linux? I'm just wondering what is the
: best way to draw the map? The way I did it in VB was using lots and

GTK is great for the interface, but for actually drawing the image I would
look at the GD library, which is specificly designed for on the fly creating
of images. It's a standard part of most distros (it is in RedHat/ Fedora).
Even has a Windows version.

http://www.boutell.com/gd/


--
==========================================================
Chris Candreva  -- chris@westnet.com -- (914) 967-7816
WestNet Internet Services of Westchester
http://www.westnet.com/

On Thu, 17 Mar 2005, Ringo wrote:


I might strongly suggest that you look at tcl/tk.  Firstly, it is a
scripting language which has a minimal learning curve, has a widget
library which is simple to use, and runs on windows, unix, linux and
elsewhere.  Secondly, linking c code, or even extending the language is
ridiculously simple.

Cheers,
Rob.

I looked at TCL/tk briefly and it is extremely easy to make buttons and
that sort of thing, but I didn't see anything for drawing. Did I miss
something? I need to be able to draw teh sonar scans, and maps and
such.
Thanks
Ringo

Ringo wrote:

I like Java for this. I'm doing most of my robotic programming
in Java now.

And besides which, I don't do graphics programming on my robot.
If I need to do something like that, I send the data over the net
and write a client to display the results in humna-readable form.
--
D. Jay Newman
http://enerd.ws/robots/

On Thu, 17 Mar 2005, Ringo wrote:


Check out the .canvas widget.  Drawing is VERY easy.  Further, there are
3rd party extensions like Zinc, which further extend the usefulness of
canvas, and the photo (image) extensions which facilitate raster style
images as well .jpg, and tcl bindings for imageMagick and GraphicsMagick.

While Java is popular, I have never really taken to the language.

Tcl/Tk has many advantages which make development quick and simple.  I
find that like forth, incremental development is very easy to accomplish
with tcl procs, but unlike forth, there is no stack based expression stuff
to learn and weird syntax stuff.  Perhaps the best benefit of Tcl/Tk is
the simplicity with which you can link C/C++ based extensions into the
scripting tools (loading .dll's (.so's) at runtime, and calling C
procedures directly ...

Info at the wiki:

    http://wiki.tcl.tk/1191  (C based extensions)
    http://wiki.tcl.tk/canvas  (Canvas based information)

    see also:  comp.lang.tcl for an active developer base and
    user assistance.

Ringo,

I've been developping applications in C or C++ for
linux/windows/solaris/Irix/QNX for a long time now. The same application
runs on all the enumerated OS. I've done a small patch for the QNX
version. That's what I use.

For buttons, menus, interface: FLTK  http://www.fltk.org , there is an
application called "fluid" from which you can design your interface.
FLTK works great with OpenGL or Mesa3D for the 2D/3D rendering.
(http://www.opengl.org  and http://www.mesa3d.org  if opengl is not
available "same function calls for both library"). Many library can be
used with that combinaison.
( http://www.mesa3d.org/libraries.html  ,
http://www.mesa3d.org/science.html  , http://www.mesa3d.org/modelers.html  )

There a lot of examples that come with FLTK.

OpenGL/Mesa3D are the fastest rendering library I've been working with.
All new graphic cards support OpenGL. On my cheap graphic card, I have a
refresh of 100 ms for 10000 Triangles in full 3D! For linux, QNX and W2K.

Hope it'll help!

Jean

Ringo wrote:

wrote:


If you like Visual Basic, you might want to check out the
Gambas basic package. Webiste is:

http://gambas.sourceforge.net/

It has a development environment very near visual basic
and it works well with Linux. It has a useful number of
visual-basic like controls.

Cheers,
Ed L