visualpython-users

[Visualpython-users] is it possible to position / resize the scene window after creating ?

[Stef M. <s.m...@ru...>]

hello,

is it possible to position / resize the scene window after creating the 
window?

It's possible with the mouse,
but when I try to do it from code,
I get some error message: "RuntimeError: Window attributes are not 
accessible once the window has been created."

If it's not possible,
is there an easy way to recreate the window,
by copying the current state to a new one window (which can be given the 
new size /position),
and destroying the old one ?

And maybe I'm going totally the wrong way in achieving my goal:
  dock (or semi-dock) the scene window in another application .
So maybe there are better suggestions.

For windows only, I can think of a trick by using a window with a hole 
in combination with AutoIt,
but besides that this is one big trick, it certainly doesn't work on 
other OS's.

thanks,
Stef Mientki

Re: [Visualpython-users] Some VPython Files

[Stef M. <s.m...@ru...>]

thanks Aaron,
for making these nice examples.
Your download links are not completely accurate:
all links gives the extension .py.txt
Frank_Hertz experiment: the text under the picture has the wrong linke:
  http://www.albion.edu/physics/ajmiller/VPython/HydrogenIonSim.py.txt

I would love to see more examples,
especially the Rob Salgado's special relativity demos,
does anyone know where I can find the sources ?

cheers,
Stef

Aaron Miller wrote:
> Hello Folks,
>
> I have enjoyed learning VPython as I teach through Bruce's book for 
> the first time this semester.  I have put a few VPython files up on 
> our webspace here: http://www.albion.edu/physics/ajmiller/VPython/
>
> In particular you might like to play with the Franck-Hertz simulation. 
>  You get to use a slider to adjust the acceleration voltage and "see" 
> the excitation of the gas medium.
>
> Thanks to everyone who uses and improves VPython.  It has been a great 
> tool this semester so far.
>
> Sincerely,
> Aaron Miller
>
> ------------------------------------------------------
> Aaron J. Miller, Ph.D.
> Department of Physics
> 328 Palenske Hall
> Albion College, Albion, MI 49224
>
> ajm...@al... <mailto:ajm...@al...>
> 517-629-0684 phone
> 517-629-0264 fax
>
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
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[Visualpython-users] Some VPython Files

[Aaron M. <ajm...@al...>]

Hello Folks,

I have enjoyed learning VPython as I teach through Bruce's book for the
first time this semester.  I have put a few VPython files up on our webspace
here: http://www.albion.edu/physics/ajmiller/VPython/

In particular you might like to play with the Franck-Hertz simulation.  You
get to use a slider to adjust the acceleration voltage and "see" the
excitation of the gas medium.

Thanks to everyone who uses and improves VPython.  It has been a great tool
this semester so far.

Sincerely,
Aaron Miller

------------------------------------------------------
Aaron J. Miller, Ph.D.
Department of Physics
328 Palenske Hall
Albion College, Albion, MI 49224

ajm...@al...
517-629-0684 phone
517-629-0264 fax

Re: [Visualpython-users] Vpython and wxPython

[Stef M. <s.m...@ru...>]

hi Jasper,

TUE ?

Jasper Stolte wrote:
> Hi Stef,
>
>
>     Now an interesting extension of your program would be to introduce a
>     disturbance,
>     simply by  pressing a button,
>     but even nicer by shaking the VPython window ;-)
>
>     We just ran it on another computer windows/linux:
>     Fedora 9.0,  200 fps ==> 50% processor time (dual core) ,
>     winXP-SP2, 200 fps ==> processor use 20%  (time between frames
>     0,0,0,15,
>     , so indeed an average of 5 msec)
>
>
> Indeed, I was thinking of reading the acceleration sensor of my 
> notebook and using that to generate a disturbance in the simulation. 
> Didn't get around to that though, so now it just has a random disturbance.
Perfect, but please also add a button, for those who don't have such a 
notebook.
I thought you added the random, just as a small noise signal. It would 
be nice to give it big sweeper, after it has reached is equilibrium.
BTW, why do you run your control machine on a higher frequency than the 
framerate ?
>
> Nice to see it runs elsewhere without too much trouble. Quite strange 
> that the processor load varies, as since I use a fixed time step ODE 
> solver, the calculations are identical each timestep. I'm interested 
> to find out how you know the timing between frames. How do you know it 
> was at 0,0,0,15 ms?
just a simple print statement:
import time
        self.ABS_TIME = time.time()

    def update(self, evt=None):
        #for n in range(10):
        for n in range(int(ceil(fs/fps))):
            self.controller.input = -self.pendulum.output() + .05*rand(2,1)
            self.pendulum.input = self.controller.output() + 1*rand()

            self.controller.timestep(1/fs)
            self.pendulum.timestep(1/fs)

        self.visualization.update()
        print ( int ( 1000 * ( time.time() - self.ABS_TIME  ) ) )
        self.ABS_TIME = time.time()

I also tried to remove the wx.Timer, and binded the update method to the 
idle event,
then testing the elapsed time to decide if the calculations should be 
done or not.
The effects are the same: steps of 15 msec :-(
Another option would be to implement your own main GUI-loop.

cheers,
Stef
>
> Greetz,
> Jasper
> ------------------------------------------------------------------------
>
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Re: [Visualpython-users] Vpython and wxPython

[Jasper S. <jas...@gm...>]

Hi Stef,


Now an interesting extension of your program would be to introduce a
> disturbance,
> simply by  pressing a button,
> but even nicer by shaking the VPython window ;-)
>
> We just ran it on another computer windows/linux:
> Fedora 9.0,  200 fps ==> 50% processor time (dual core) ,
> winXP-SP2, 200 fps ==> processor use 20%  (time between frames 0,0,0,15,
> , so indeed an average of 5 msec)
>

Indeed, I was thinking of reading the acceleration sensor of my notebook and
using that to generate a disturbance in the simulation. Didn't get around to
that though, so now it just has a random disturbance.

Nice to see it runs elsewhere without too much trouble. Quite strange that
the processor load varies, as since I use a fixed time step ODE solver, the
calculations are identical each timestep. I'm interested to find out how you
know the timing between frames. How do you know it was at 0,0,0,15 ms?

Greetz,
Jasper

Re: [Visualpython-users] Vpython and wxPython

[Stef M. <s.m...@ru...>]

hi Jasper,

Jasper Stolte wrote:
> Hi all,
>  
> After very little effort I got them working together a few weeks ago 
> in my pendulum simulator, which can be downloaded from google code.. I 
> wanted to post the result to the wx-python list when it is a bit more 
> mature, as it's not quite finished yet. Anyway, run src/main.py, 
> screenshot attached. It's got a wxPython part which shows a slider 
> with which you can influence the pendulum length. Under Linux, this is 
> a real-time simulation, but under Windows I guess smth is messed up 
> with the wx.Timer so it is very slow.
I tested under winXP-SP2 and it's not slow, but it's not fluently. The 
wx.Timer has a 15 msec resolution, your demo wants 20 msec,
so when you print the elapsed time, you get 15 or 30 mseconds, with 
probably an average of 20 msec ?
Also interesting to know that the processor loads varies a lot, between 
less than 1% upto 15% (dual core).

On the same machine I have Ubuntu in Virtualbox installed. It's funny to 
see that in Windows/Virtual box/Ubuntu it runs fluently, time varies 
between 18 .. 22  msec. So I'm very satisfied about the Virtualbox.

So the machine is not the problem, but indeed the implementation of 
wx.Timer under windows. I'll post a question on the wxPython list if 
it's possible to replace the timer by a high-resolution timer ( I won't 
mention your application yet ;-), I also need it for 2D simulation.

I'm not familiar with VPython, but I guess you can set the antialiazing 
of the graphics card in there.
I did set it manual on my graphics card and it looks much more beautiful.

Now an interesting extension of your program would be to introduce a 
disturbance,
simply by  pressing a button,
but even nicer by shaking the VPython window ;-)

We just ran it on another computer windows/linux:
Fedora 9.0,  200 fps ==> 50% processor time (dual core) ,
winXP-SP2, 200 fps ==> processor use 20%  (time between frames 0,0,0,15, 
, so indeed an average of 5 msec)

So indeed it's very well possible to make nice applications with 
wxPython + VPython.

thanks very much,
cheers,
Stef


>  
> >> svn checkout */http 
> <http://pendulum-cart.googlecode.com/svn/trunk/>/*://pendulum-cart.googlecode.com/svn/trunk/
>  
> Anyway, the solution really was as simple as mentioned here. You can 
> just import visual and create a scene. This scene will then be 
> displayed in a separate window. As long as you keep track of the 
> visual object in the wxPython framework, you can manipulate it any way 
> you like from the wxPython program.
>  
> Even nicer would be if somehow the OpenGL canvas would be available in 
> Python visual object, so you could really draw it to a wxPython 
> window. Now there's that extra GTK frame hanging around with the 3D 
> rendering. Not that this is a big issue or anything. Just something to 
> put on the wishlist for when the important things are already working.. ;)
>  
> Greetz,
> Jasper 
>  
>  
>  
> On Fri, Oct 31, 2008 at 1:36 AM, Stef Mientki <s.m...@ru... 
> <mailto:s.m...@ru...>> wrote:
>
>     Jose, Bruce,
>
>     thanks for your answers....
>
>     Jose Antonio Martin H wrote:
>     > Hi ,
>     >
>     >> This doesn't seem to be possible at first sight, because both
>     >> environments claim the main loop
>     >>
>     >
>     > Vpython does not claim a main loop.
>     >
>     > You can simply create the scene, the objects, etc...
>     >
>     > And have your Wxpython program running, vpython will continue
>     executing and
>     > you can change the objects of vpython from whithin your App
>     directly.
>     >
>     That sounds really simple.
>     I've to admit, that I never investigated the possibilities,
>     because on the wxPython list, this is the usual answer:
>
>      "Both wxpython and vpython are great tools, which I'd love to use
>     together for my program. The problem is they each run their own event
>     loop. Now almighty Google taught me there were some ancient threads on
>     the topic stating it would be very hard to combine the two."
>
>     If I've some more time I'll certainly will try it.
>
>     btw, does anyone has a (working) example of wxPython + VPython ?
>
>     thanks again,
>     Stef Mientki
>
>     > Also, you can indeed control the speed at wich the vpython do
>     what it to
>     > with the rate() comand, or just ignore it for full speed.
>     >
>     > Thats all.
>     >
>     > Hope this help.
>     > JAMH.
>     > ----- Original Message -----
>     > From: "Bruce Peterson" <bap...@te...
>     <mailto:bap...@te...>>
>     > To: <vis...@li...
>     <mailto:vis...@li...>>
>     > Sent: Friday, October 31, 2008 12:30 AM
>     > Subject: [Visualpython-users] Vpython and wxPython
>     >
>     >
>     >
>     >> Hi Stef
>     >>   I did this some years ago, but as I recall, the key to using
>     >> Vpython from Wx python is to create a client-server architecture.
>     >> Create your Vpython application as a com object with variable
>     >> parameters expressed as public methods. The server is launched from
>     >> your Wxpython application. The Wxpython app provides the UI and
>     >> allows updating the Vpython parameters with each pass through
>     the control
>     >> loop.
>     >>
>     >> Bruce
>     >>
>     >> At 03:10 PM 10/30/2008, you wrote:
>     >>
>     >>> From: Stef Mientki <s.m...@ru... <mailto:s.m...@ru...>>
>     >>> Precedence: list
>     >>> MIME-Version: 1.0
>     >>> To: vis...@li...
>     <mailto:vis...@li...>
>     >>> Date: Thu, 30 Oct 2008 00:18:31 +0100
>     >>> Message-ID: <490...@ru...
>     <mailto:490...@ru...>>
>     >>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>     >>> Subject: [Visualpython-users] WPython + wxPython possible ?
>     >>> Message: 5
>     >>>
>     >>> hello,
>     >>>
>     >>> now there's some activity on the list,
>     >>> I (and many other wxPython users) would love to use VPython from a
>     >>> wxPython application.
>     >>>
>     >>> This doesn't seem to be possible at first sight, because both
>     >>> environments claim the main loop
>     >>> (but I'm not an expert).
>     >>>
>     >>> There's an example on youtube:
>     >>> http://www.youtube.com/watch?v=nMNzMwDXHLA
>     >>>
>     >>> but this could well be 2 separate applications,
>     >>> communicating in some clever way.
>     >>> But that's also an acceptable solution.
>     >>>
>     >>> Any suggestions / answers / links ?
>     >>>
>     >>> thanks,
>     >>> Stef Mientki
>     >>>
>     >>
>     -------------------------------------------------------------------------
>     >> This SF.Net email is sponsored by the Moblin Your Move Developer's
>     >> challenge
>     >> Build the coolest Linux based applications with Moblin SDK &
>     win great
>     >> prizes
>     >> Grand prize is a trip for two to an Open Source event anywhere
>     in the
>     >> world
>     >> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>     <http://moblin-contest.org/redirect.php?banner_id=100&url=/>
>     >> _______________________________________________
>     >> Visualpython-users mailing list
>     >> Vis...@li...
>     <mailto:Vis...@li...>
>     >> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>     >>
>     >>
>     >
>     >
>     >
>     -------------------------------------------------------------------------
>     > This SF.Net email is sponsored by the Moblin Your Move
>     Developer's challenge
>     > Build the coolest Linux based applications with Moblin SDK & win
>     great prizes
>     > Grand prize is a trip for two to an Open Source event anywhere
>     in the world
>     > http://moblin-contest.org/redirect.php?banner_id=100&url=/
>     <http://moblin-contest.org/redirect.php?banner_id=100&url=/>
>     > _______________________________________________
>     > Visualpython-users mailing list
>     > Vis...@li...
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>     > https://lists.sourceforge.net/lists/listinfo/visualpython-users
>     >
>     >
>     >
>
>     -------------------------------------------------------------------------
>     This SF.Net email is sponsored by the Moblin Your Move Developer's
>     challenge
>     Build the coolest Linux based applications with Moblin SDK & win
>     great prizes
>     Grand prize is a trip for two to an Open Source event anywhere in
>     the world
>     http://moblin-contest.org/redirect.php?banner_id=100&url=/
>     <http://moblin-contest.org/redirect.php?banner_id=100&url=/>
>     _______________________________________________
>     Visualpython-users mailing list
>     Vis...@li...
>     <mailto:Vis...@li...>
>     https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> ------------------------------------------------------------------------
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>   

Re: [Visualpython-users] Vpython and wxPython

[Stef M. <s.m...@ru...>]

hi Jasper,

looks great !!

Jasper Stolte wrote:
> Hi all,
>  
> After very little effort I got them working together a few weeks ago 
> in my pendulum simulator, which can be downloaded from google code.. I 
> wanted to post the result to the wx-python list when it is a bit more 
> mature, as it's not quite finished yet.
Yes do so, I think it's very valuable for wxPython users !!
> Anyway, run src/main.py, screenshot attached. It's got a wxPython part 
> which shows a slider with which you can influence the pendulum length. 
> Under Linux, this is a real-time simulation, but under Windows I guess 
> smth is messed up with the wx.Timer so it is very slow.
At this moment I only looked at the picture,
I'll try it this evening under windows to see how fast / slow it is.
>  
> >> svn checkout */http 
> <http://pendulum-cart.googlecode.com/svn/trunk/>/*://pendulum-cart.googlecode.com/svn/trunk/
>  
> Anyway, the solution really was as simple as mentioned here. You can 
> just import visual and create a scene. This scene will then be 
> displayed in a separate window. As long as you keep track of the 
> visual object in the wxPython framework, you can manipulate it any way 
> you like from the wxPython program.
>  
> Even nicer would be if somehow the OpenGL canvas would be available in 
> Python visual object, so you could really draw it to a wxPython 
> window. Now there's that extra GTK frame hanging around with the 3D 
> rendering. Not that this is a big issue or anything. Just something to 
> put on the wishlist for when the important things are already working.. ;)
>  
yes that's the final step.
I don't know if it's possible to dock arbitrary application in a 
wxPython window ?

thanks,
Stef Mientki
> Greetz,
> Jasper 
>  
>  
>  
> On Fri, Oct 31, 2008 at 1:36 AM, Stef Mientki <s.m...@ru... 
> <mailto:s.m...@ru...>> wrote:
>
>     Jose, Bruce,
>
>     thanks for your answers....
>
>     Jose Antonio Martin H wrote:
>     > Hi ,
>     >
>     >> This doesn't seem to be possible at first sight, because both
>     >> environments claim the main loop
>     >>
>     >
>     > Vpython does not claim a main loop.
>     >
>     > You can simply create the scene, the objects, etc...
>     >
>     > And have your Wxpython program running, vpython will continue
>     executing and
>     > you can change the objects of vpython from whithin your App
>     directly.
>     >
>     That sounds really simple.
>     I've to admit, that I never investigated the possibilities,
>     because on the wxPython list, this is the usual answer:
>
>      "Both wxpython and vpython are great tools, which I'd love to use
>     together for my program. The problem is they each run their own event
>     loop. Now almighty Google taught me there were some ancient threads on
>     the topic stating it would be very hard to combine the two."
>
>     If I've some more time I'll certainly will try it.
>
>     btw, does anyone has a (working) example of wxPython + VPython ?
>
>     thanks again,
>     Stef Mientki
>
>     > Also, you can indeed control the speed at wich the vpython do
>     what it to
>     > with the rate() comand, or just ignore it for full speed.
>     >
>     > Thats all.
>     >
>     > Hope this help.
>     > JAMH.
>     > ----- Original Message -----
>     > From: "Bruce Peterson" <bap...@te...
>     <mailto:bap...@te...>>
>     > To: <vis...@li...
>     <mailto:vis...@li...>>
>     > Sent: Friday, October 31, 2008 12:30 AM
>     > Subject: [Visualpython-users] Vpython and wxPython
>     >
>     >
>     >
>     >> Hi Stef
>     >>   I did this some years ago, but as I recall, the key to using
>     >> Vpython from Wx python is to create a client-server architecture.
>     >> Create your Vpython application as a com object with variable
>     >> parameters expressed as public methods. The server is launched from
>     >> your Wxpython application. The Wxpython app provides the UI and
>     >> allows updating the Vpython parameters with each pass through
>     the control
>     >> loop.
>     >>
>     >> Bruce
>     >>
>     >> At 03:10 PM 10/30/2008, you wrote:
>     >>
>     >>> From: Stef Mientki <s.m...@ru... <mailto:s.m...@ru...>>
>     >>> Precedence: list
>     >>> MIME-Version: 1.0
>     >>> To: vis...@li...
>     <mailto:vis...@li...>
>     >>> Date: Thu, 30 Oct 2008 00:18:31 +0100
>     >>> Message-ID: <490...@ru...
>     <mailto:490...@ru...>>
>     >>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>     >>> Subject: [Visualpython-users] WPython + wxPython possible ?
>     >>> Message: 5
>     >>>
>     >>> hello,
>     >>>
>     >>> now there's some activity on the list,
>     >>> I (and many other wxPython users) would love to use VPython from a
>     >>> wxPython application.
>     >>>
>     >>> This doesn't seem to be possible at first sight, because both
>     >>> environments claim the main loop
>     >>> (but I'm not an expert).
>     >>>
>     >>> There's an example on youtube:
>     >>> http://www.youtube.com/watch?v=nMNzMwDXHLA
>     >>>
>     >>> but this could well be 2 separate applications,
>     >>> communicating in some clever way.
>     >>> But that's also an acceptable solution.
>     >>>
>     >>> Any suggestions / answers / links ?
>     >>>
>     >>> thanks,
>     >>> Stef Mientki
>     >>>
>     >>
>     -------------------------------------------------------------------------
>     >> This SF.Net email is sponsored by the Moblin Your Move Developer's
>     >> challenge
>     >> Build the coolest Linux based applications with Moblin SDK &
>     win great
>     >> prizes
>     >> Grand prize is a trip for two to an Open Source event anywhere
>     in the
>     >> world
>     >> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>     <http://moblin-contest.org/redirect.php?banner_id=100&url=/>
>     >> _______________________________________________
>     >> Visualpython-users mailing list
>     >> Vis...@li...
>     <mailto:Vis...@li...>
>     >> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>     >>
>     >>
>     >
>     >
>     >
>     -------------------------------------------------------------------------
>     > This SF.Net email is sponsored by the Moblin Your Move
>     Developer's challenge
>     > Build the coolest Linux based applications with Moblin SDK & win
>     great prizes
>     > Grand prize is a trip for two to an Open Source event anywhere
>     in the world
>     > http://moblin-contest.org/redirect.php?banner_id=100&url=/
>     <http://moblin-contest.org/redirect.php?banner_id=100&url=/>
>     > _______________________________________________
>     > Visualpython-users mailing list
>     > Vis...@li...
>     <mailto:Vis...@li...>
>     > https://lists.sourceforge.net/lists/listinfo/visualpython-users
>     >
>     >
>     >
>
>     -------------------------------------------------------------------------
>     This SF.Net email is sponsored by the Moblin Your Move Developer's
>     challenge
>     Build the coolest Linux based applications with Moblin SDK & win
>     great prizes
>     Grand prize is a trip for two to an Open Source event anywhere in
>     the world
>     http://moblin-contest.org/redirect.php?banner_id=100&url=/
>     <http://moblin-contest.org/redirect.php?banner_id=100&url=/>
>     _______________________________________________
>     Visualpython-users mailing list
>     Vis...@li...
>     <mailto:Vis...@li...>
>     https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> ------------------------------------------------------------------------
>
> _______________________________________________
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Re: [Visualpython-users] WPython + wxPython possible ?

[CL <clc...@gm...>]

It is possible and quite simple. I have intergrated it with PyODE and
wxPython and make a robot simulator:
http://hk.myblog.yahoo.com/jw!afd6dGGRHBRkp2laqwk198fg/article?mid=413

A robot arm controller also:
http://hk.youtube.com/watch?v=c5RNDPbl_kY
http://hk.youtube.com/watch?v=1tg5v9Z9BPw

Use multiple thread can make the work down easily.


Run the main application of wxPython as usual.
    _app = myApp(0)
    _app.MainLoop()

Create the world
            scene = display(title=title, width=width,height=height,x=x,y=y)

Create thread for the scene object control.
Start the thread
   The thread's main loops is something like this:
   while not finish:
          update objects in the scene
          rate(time slice)


CL

Re: [Visualpython-users] Vpython and wxPython

[Stef M. <s.m...@ru...>]

Jose, Bruce,

thanks for your answers....

Jose Antonio Martin H wrote:
> Hi ,
>   
>> This doesn't seem to be possible at first sight, because both
>> environments claim the main loop
>>     
>
> Vpython does not claim a main loop.
>
> You can simply create the scene, the objects, etc...
>
> And have your Wxpython program running, vpython will continue executing and
> you can change the objects of vpython from whithin your App directly.
>   
That sounds really simple.
I've to admit, that I never investigated the possibilities,
because on the wxPython list, this is the usual answer:

 "Both wxpython and vpython are great tools, which I'd love to use 
together for my program. The problem is they each run their own event 
loop. Now almighty Google taught me there were some ancient threads on 
the topic stating it would be very hard to combine the two."

If I've some more time I'll certainly will try it.

btw, does anyone has a (working) example of wxPython + VPython ?

thanks again,
Stef Mientki

> Also, you can indeed control the speed at wich the vpython do what it to
> with the rate() comand, or just ignore it for full speed.
>
> Thats all.
>
> Hope this help.
> JAMH.
> ----- Original Message ----- 
> From: "Bruce Peterson" <bap...@te...>
> To: <vis...@li...>
> Sent: Friday, October 31, 2008 12:30 AM
> Subject: [Visualpython-users] Vpython and wxPython
>
>
>   
>> Hi Stef
>>   I did this some years ago, but as I recall, the key to using
>> Vpython from Wx python is to create a client-server architecture.
>> Create your Vpython application as a com object with variable
>> parameters expressed as public methods. The server is launched from
>> your Wxpython application. The Wxpython app provides the UI and
>> allows updating the Vpython parameters with each pass through the control 
>> loop.
>>
>> Bruce
>>
>> At 03:10 PM 10/30/2008, you wrote:
>>     
>>> From: Stef Mientki <s.m...@ru...>
>>> Precedence: list
>>> MIME-Version: 1.0
>>> To: vis...@li...
>>> Date: Thu, 30 Oct 2008 00:18:31 +0100
>>> Message-ID: <490...@ru...>
>>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>> Subject: [Visualpython-users] WPython + wxPython possible ?
>>> Message: 5
>>>
>>> hello,
>>>
>>> now there's some activity on the list,
>>> I (and many other wxPython users) would love to use VPython from a
>>> wxPython application.
>>>
>>> This doesn't seem to be possible at first sight, because both
>>> environments claim the main loop
>>> (but I'm not an expert).
>>>
>>> There's an example on youtube:
>>> http://www.youtube.com/watch?v=nMNzMwDXHLA
>>>
>>> but this could well be 2 separate applications,
>>> communicating in some clever way.
>>> But that's also an acceptable solution.
>>>
>>> Any suggestions / answers / links ?
>>>
>>> thanks,
>>> Stef Mientki
>>>       
>> -------------------------------------------------------------------------
>> This SF.Net email is sponsored by the Moblin Your Move Developer's 
>> challenge
>> Build the coolest Linux based applications with Moblin SDK & win great 
>> prizes
>> Grand prize is a trip for two to an Open Source event anywhere in the 
>> world
>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> _______________________________________________
>> Visualpython-users mailing list
>> Vis...@li...
>> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>>
>>     
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
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> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>
>   

Re: [Visualpython-users] Vpython and wxPython

[Jose A. M. H <jam...@fd...>]

Hi ,
>This doesn't seem to be possible at first sight, because both
>environments claim the main loop

Vpython does not claim a main loop.

You can simply create the scene, the objects, etc...

And have your Wxpython program running, vpython will continue executing and
you can change the objects of vpython from whithin your App directly.

Also, you can indeed control the speed at wich the vpython do what it to
with the rate() comand, or just ignore it for full speed.

Thats all.

Hope this help.
JAMH.
----- Original Message ----- 
From: "Bruce Peterson" <bap...@te...>
To: <vis...@li...>
Sent: Friday, October 31, 2008 12:30 AM
Subject: [Visualpython-users] Vpython and wxPython


> Hi Stef
>   I did this some years ago, but as I recall, the key to using
> Vpython from Wx python is to create a client-server architecture.
> Create your Vpython application as a com object with variable
> parameters expressed as public methods. The server is launched from
> your Wxpython application. The Wxpython app provides the UI and
> allows updating the Vpython parameters with each pass through the control 
> loop.
>
> Bruce
>
> At 03:10 PM 10/30/2008, you wrote:
>>From: Stef Mientki <s.m...@ru...>
>>Precedence: list
>>MIME-Version: 1.0
>>To: vis...@li...
>>Date: Thu, 30 Oct 2008 00:18:31 +0100
>>Message-ID: <490...@ru...>
>>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>Subject: [Visualpython-users] WPython + wxPython possible ?
>>Message: 5
>>
>>hello,
>>
>>now there's some activity on the list,
>>I (and many other wxPython users) would love to use VPython from a
>>wxPython application.
>>
>>This doesn't seem to be possible at first sight, because both
>>environments claim the main loop
>>(but I'm not an expert).
>>
>>There's an example on youtube:
>>http://www.youtube.com/watch?v=nMNzMwDXHLA
>>
>>but this could well be 2 separate applications,
>>communicating in some clever way.
>>But that's also an acceptable solution.
>>
>>Any suggestions / answers / links ?
>>
>>thanks,
>>Stef Mientki
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's 
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great 
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the 
> world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users
> 

Re: [Visualpython-users] Compiling under Fedora 9

[Anders P. <an...@gm...>]

Ok, there were two documents necessary to read in order to install:
linux_download.html and INSTALL.txt
I did the "mkdir build" trick and found the build.log that told me to
install g++. D'oh..
Now I get some fresh compilation errors. Seems like it won't find numpy
which I'll look into some other day.

Also, there are complaints over boost::python::numeric so I still wonder
about the libboost-python-dev and libboost-threads-dev issue.

/Anders



On Thu, Oct 30, 2008 at 11:10 PM, Anders Petersson <an...@gm...> wrote:

> Hello
> I installed VMWare under Windows XP with a Fedora 9 image to get a
> reasonable development environment for my hobby project.
>
> Here's the steps I went through to install VPython:
>
> Download vpython tar.bz2  (the beta)
> install python-devel package
> install boost-devel package
> install numpy package
> install gtkglextmm-devel package
> install libglademm24-devel package
>
> I couldn't locate libboost-python-dev and libboost-threads-dev for
> Fedora... can I use the Debian packages?
>
> In the mean time, let's try anyway.
>
> run ./configure
>
> run sudo make install
>
> Output:
> <cut>
> Making install in src
> make[1]: Entering directory `/home/andpe/Download/visual-4.beta26/src'
> Compiling ./core/arrow.cpp ...
> make[1]: *** [arrow.lo] Error 1
> make[1]: Leaving directory `/home/andpe/Download/visual-4.beta26/src'
> make: *** [install-recursive] Error 1
>
> Strange, no error message. Any idea?
> This is my gcc version:
> gcc (GCC) 4.3.0 20080416 (Red Hat 4.3.0-7)
>
> Regards
> /Anders Petersson
>

[Visualpython-users] Vpython and wxPython

[Bruce P. <bap...@te...>]

Hi Stef
   I did this some years ago, but as I recall, the key to using 
Vpython from Wx python is to create a client-server architecture. 
Create your Vpython application as a com object with variable 
parameters expressed as public methods. The server is launched from 
your Wxpython application. The Wxpython app provides the UI and 
allows updating the Vpython parameters with each pass through the control loop.

Bruce

At 03:10 PM 10/30/2008, you wrote:
>From: Stef Mientki <s.m...@ru...>
>Precedence: list
>MIME-Version: 1.0
>To: vis...@li...
>Date: Thu, 30 Oct 2008 00:18:31 +0100
>Message-ID: <490...@ru...>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>Subject: [Visualpython-users] WPython + wxPython possible ?
>Message: 5
>
>hello,
>
>now there's some activity on the list,
>I (and many other wxPython users) would love to use VPython from a 
>wxPython application.
>
>This doesn't seem to be possible at first sight, because both 
>environments claim the main loop
>(but I'm not an expert).
>
>There's an example on youtube:
>http://www.youtube.com/watch?v=nMNzMwDXHLA
>
>but this could well be 2 separate applications,
>communicating in some clever way.
>But that's also an acceptable solution.
>
>Any suggestions / answers / links ?
>
>thanks,
>Stef Mientki

[Visualpython-users] Compiling under Fedora 9

[Anders P. <an...@gm...>]

Hello
I installed VMWare under Windows XP with a Fedora 9 image to get a
reasonable development environment for my hobby project.

Here's the steps I went through to install VPython:

Download vpython tar.bz2  (the beta)
install python-devel package
install boost-devel package
install numpy package
install gtkglextmm-devel package
install libglademm24-devel package

I couldn't locate libboost-python-dev and libboost-threads-dev for
Fedora... can I use the Debian packages?

In the mean time, let's try anyway.

run ./configure

run sudo make install

Output:
<cut>
Making install in src
make[1]: Entering directory `/home/andpe/Download/visual-4.beta26/src'
Compiling ./core/arrow.cpp ...
make[1]: *** [arrow.lo] Error 1
make[1]: Leaving directory `/home/andpe/Download/visual-4.beta26/src'
make: *** [install-recursive] Error 1

Strange, no error message. Any idea?
This is my gcc version:
gcc (GCC) 4.3.0 20080416 (Red Hat 4.3.0-7)

Regards
/Anders Petersson

[Visualpython-users] Would you like to contribute to VPython development?

[Bruce S. <Bru...@nc...>]

There are three ancient components of Visual that are pure Python (no 
C++, no multithreading issues, no cross-platform issues) that could 
benefit from some work and improvement: graph.py, controls.py, and text.py.

The case of graph.py is a bit special, because some changes have been 
made to the version that goes with the upcoming Visual 5.00, so it would 
be important to pay attention to the differences. For example, gdots now 
use the new points object rather than letter o's in labels.

If you feel confident in Python programming, please consider taking a 
look at these components and volunteering to improve them. Thanks!

Bruce Sherwood

[Visualpython-users] WPython + wxPython possible ?

[Stef M. <s.m...@ru...>]

hello,

now there's some activity on the list,
I (and many other wxPython users) would love to use VPython from a 
wxPython application.

This doesn't seem to be possible at first sight, because both 
environments claim the main loop
(but I'm not an expert).

There's an example on youtube:
http://www.youtube.com/watch?v=nMNzMwDXHLA

but this could well be 2 separate applications,
communicating in some clever way.
But that's also an acceptable solution.

Any suggestions / answers / links ?

thanks,
Stef Mientki

Re: [Visualpython-users] 2D GUI widgets

[chris l. <chr...@sp...>]

I've used the slider and menu items from vpython and they have the 
advantage that you can keep all control within the vpython environment. 
They don't  provide a complete GUI environment but allow a small degree 
of control but are not really suitable fro applications that might 
require lists of items that are larger than that that can be displayed 
in the one window and the lack of the exact size of the label window 
leads to some rather unexpected side effects.

The mechanisms for transferring information from the visual python 
environment to a different GUI can get a little involved, o if you want 
something within the display window they still provide a nice quick 
alternative to multiple threads and queues. There is a controls.display 
attribute that allows you to mix controls and visual python objects in 
the same display.


Anders Petersson wrote:
> Personally I would be interested in such examples. Could you kindly 
> upload them to the wiki? Or maybe some links if there are already good 
> explanations.
>
> Thanks,
> Anders Petersson
>
> On Wed, Oct 29, 2008 at 2:53 AM, marc desmarais <mde...@ya... 
> <mailto:mde...@ya...>> wrote:
>
>     Regarding the use of sliders and other 2D GUI widgets, I would
>     really encourage folks to use Tkinter.  It does a much better job.
>
>     I can contribute examples if you want.
>
>     Best to concentrate Vpython's efforts on 3D I think.
>
>     Marc Desmarais
>     Long Beach, CA
>
>
>
>     -------------------------------------------------------------------------
>     This SF.Net email is sponsored by the Moblin Your Move Developer's
>     challenge
>     Build the coolest Linux based applications with Moblin SDK & win
>     great prizes
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>     the world
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>     <http://moblin-contest.org/redirect.php?banner_id=100&url=/>
>     _______________________________________________
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>     Vis...@li...
>     <mailto:Vis...@li...>
>     https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
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> ------------------------------------------------------------------------
>
> _______________________________________________
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> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>   

Re: [Visualpython-users] 2D GUI widgets

[Anders P. <an...@gm...>]

Personally I would be interested in such examples. Could you kindly upload
them to the wiki? Or maybe some links if there are already good
explanations.

Thanks,
Anders Petersson

On Wed, Oct 29, 2008 at 2:53 AM, marc desmarais <mde...@ya...> wrote:

> Regarding the use of sliders and other 2D GUI widgets, I would really
> encourage folks to use Tkinter.  It does a much better job.
>
> I can contribute examples if you want.
>
> Best to concentrate Vpython's efforts on 3D I think.
>
> Marc Desmarais
> Long Beach, CA
>
>
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's
> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users
>
>

[Visualpython-users] 2D GUI widgets

[marc d. <mde...@ya...>]

Regarding the use of sliders and other 2D GUI widgets, I would really encourage folks to use Tkinter.  It does a much better job.

I can contribute examples if you want.

Best to concentrate Vpython's efforts on 3D I think.

Marc Desmarais

Long Beach, CA

 



      

[Visualpython-users] range

[Bruce S. <Bru...@nc...>]

For technical reasons I was unable to respond to this earlier.

Executing "range = 100" means that you've changed the interpretation of
"range" to be a label for the integer constant "100", so that when you
then try to loop over range the original interpretation (make a list) has
been lost.

However, use of "range" in a list of function arguments doesn't redefine
its meaning outside that domain.

Bruce Sherwood

--------------------------

I have been studying Vpython modules Text and Controls and I 
am a little confused by the use of  'range'. The __init__ parameter 
list looks like this:

 > > def __init__(self, x=0, y=0, width=300, height=320,
 > > range=100,title=None, foreground=None, background=None):
 > >
 > > Now RANGE is of course a keyword, but it is being used here as a
 > > variable.
 > >
 > > Using IDLE 1.2.2 produces the following error.
 > >
 > > range=100
 > > ......
 > > for a in range(1,10):<br>
 > > .....
 > > TypeError: 'int' object is not callable<br>
 > >
 > > Am I missing something?

Re: [Visualpython-users] The VPython project

[Bruce S. <Bru...@nc...>]

Glad you like VPython!

VPython was created in 2000 at Carnegie Mellon University for use by 
students doing computational modeling in an introductory physics course. 
As a result of that origin, it got known initially in physics education 
circles. However, it has been making its way out of that community. 
Particularly gratifying is that it is seeing growing use in the 
scientific research community, initially mainly physicists. The value of 
VPython to research scientists is that they sometimes have a need for a 
more flexible way to generate 3D images and data visualizations than any 
application or group of applications can provide. There is power in a 
programming environment that is difficult to capture in a nonprogramming 
application.

I think it's fair to say that VPython lacks many things required for 
serious game construction, though I don't know enough about the issue to 
identify them precisely.

Not sure what you have in mind about "draw resources away from VPython". 
At a personal level, I'm deeply involved with Ruth Chabay in trying to 
wrench introductory physics out of the 19th century, and this effort has 
been so enormously difficult that it has left little time for VPython 
development. However, the physics education effort is now somewhat 
mature, if unfinished (we need to produce a significant 3rd edition of 
our textbook by March), and I've deliberately been working on VPython 
again for the last year. I retired in July in part to delve more deeply 
into development. It was a hugely important accident that David Scherer, 
the originator of VPython, came back to work on it again during the last 
eight months. He has made an enormous difference in the quality of the 
new Visual 5 which will be released soon.

The growth and stability of an open source project seem to depend on 
there being a number of developers who can contribute from time to time. 
Unfortunately, very few people in the VPython community have been able 
to contribute to its development and maintenance, because it is a 
complex multiplatform multithreaded C++ project. I see this as a 
significant problem.

Bruce Sherwood

Anders Petersson wrote:
> Hello
> 
> I'm a software developer living in Linköping, Sweden. Usually I don't do 
> programming in my spare time, but since a couple of weeks I'm working 
> intensely on a hobby project. I'm using VPython to create a program with 
> generic functionality to visualize, animate and edit data structures 
> such as graphs and trees. With 10K lines of code so far and still a long 
> way to go, it's a pretty ambitious project.
> I hope to be able to return to you with some concrete results and 
> screenshots!
> 
> I'm a fan of VPython. Using primitive 3D objects is the right 
> abstraction level for my project and VPython makes this easy to use. Of 
> course, all the benefits of Python are there too. Defining my own 
> __setattr__() allows me to continue to extend the VPython abstraction of 
> doing "obj.pos = (x,y,z)" etc.
> 
> I'm happy to see that the project is evolving, with the beta of a new 
> major version and a new wiki. Actually I'm surprised to see that VPython 
> isn't more heavily used than it seems to be. It seems to be mostly used 
> in education to visualize physics etc.
> http://www.vrplumber.com/py3d.py has a long list of Python 3D projects. 
> Other Python frameworks seem to provide either advanced but low-level 
> features, or are less complete than VPython.
> Certainly there is a general need for an easy-to-use 3d engine for all 
> kinds of projects... but the only major VPython project I found is PyGeo.
> 
> If I may trouble the list for some answers, to get a better view of 
> VPython and its community:
> 
> What are your interests in VPython? What drives you to contribute to the 
> project?
> 
> What do you think vpython's niche and goals are? Are there any design 
> decisions that limit the suitability of VPython for certain areas? (For 
> example game programming or large-scale visualization or animation)
> 
> Are there competing projects that draw resources away from VPython?
> 
> 
> For me right now, the weakest point is the handling of text in 3d 
> scenes. Labels don't integrate into the scene but floats on top of it, 
> covering all 3d objects. Maybe the Beta's (future?) ability to use 
> textures can be utilized with PIL to render texts into the scene rather 
> than on top of it.
> 
> Interested to hear from you.
> Regards,
> Anders Petersson

[Visualpython-users] The VPython project

[Anders P. <an...@gm...>]

Hello

I'm a software developer living in Linköping, Sweden. Usually I don't do
programming in my spare time, but since a couple of weeks I'm working
intensely on a hobby project. I'm using VPython to create a program with
generic functionality to visualize, animate and edit data structures such as
graphs and trees. With 10K lines of code so far and still a long way to go,
it's a pretty ambitious project.
I hope to be able to return to you with some concrete results and
screenshots!

I'm a fan of VPython. Using primitive 3D objects is the right abstraction
level for my project and VPython makes this easy to use. Of course, all the
benefits of Python are there too. Defining my own __setattr__() allows me to
continue to extend the VPython abstraction of doing "obj.pos = (x,y,z)" etc.

I'm happy to see that the project is evolving, with the beta of a new major
version and a new wiki. Actually I'm surprised to see that VPython isn't
more heavily used than it seems to be. It seems to be mostly used in
education to visualize physics etc.
http://www.vrplumber.com/py3d.py has a long list of Python 3D projects.
Other Python frameworks seem to provide either advanced but low-level
features, or are less complete than VPython.
Certainly there is a general need for an easy-to-use 3d engine for all kinds
of projects... but the only major VPython project I found is PyGeo.

If I may trouble the list for some answers, to get a better view of VPython
and its community:

What are your interests in VPython? What drives you to contribute to the
project?

What do you think vpython's niche and goals are? Are there any design
decisions that limit the suitability of VPython for certain areas? (For
example game programming or large-scale visualization or animation)

Are there competing projects that draw resources away from VPython?


For me right now, the weakest point is the handling of text in 3d scenes.
Labels don't integrate into the scene but floats on top of it, covering all
3d objects. Maybe the Beta's (future?) ability to use textures can be
utilized with PIL to render texts into the scene rather than on top of it.

Interested to hear from you.
Regards,
Anders Petersson

Re: [Visualpython-users] Danish characters

[Bruce S. <Bru...@nc...>]

In Visual 3 (the production version), there is no support for unicode in 
label objects or display (window) titles.

In Visual 5 about to be released, the following program displays Spanish 
correctly:

#!/usr/bin/env python
# -*- coding: latin-1 -*-
from visual import *
label(text=u'¿No está la niña?')

However, even in Visual 5 there isn't yet unicode support for display 
titles.

Bruce Sherwood

Poul Riis wrote:
> I can print the special Danish characters this way:
> print 'Danish characters:
> '+unichr(230)+unichr(248)+unichr(229)+unichr(198)+unichr(216)+unichr(197)
> 
> - but how can I use them in display titles?
> 
> 
> Poul Riis
> 

[Visualpython-users] Danish characters

[Poul R. <Pou...@sk...>]

I can print the special Danish characters this way:
print 'Danish characters:
'+unichr(230)+unichr(248)+unichr(229)+unichr(198)+unichr(216)+unichr(197)

- but how can I use them in display titles?


Poul Riis

[Visualpython-users] Sliders

[Poul R. <Pou...@sk...>]

In the example below I expect the slider button to start in the middle of
the horizontal rod (value 0). However, it starts at the very left and can
only be moved to the middle of the rod. Am I doing something wrong? (I use
the beta version of VPython)

Poul Riis



from visual import *
from visual.controls import *

scene=display(title="Sliding
box",width=860,height=860,forward=(-2,-1,-0.5),up=(0,0,1),background=(1,1,1))
boxcontrol =controls(title='x-position', x=0, y=700, width=800,
height=150, range=100)

boxslider = slider(pos=(-100,0), width=2, length=200, min=-2, max=2,
color=(0,1,0))
boxslider.value=0

xaxis=arrow(pos=(-3,0,0),axis=(6,0,0),color=(1,0,1),shaftwidth=0.05,fixedwidth
= 1)
yaxis=arrow(pos=(0,-3,0),axis=(0,6,0),color=(1,1,0),shaftwidth=0.05,fixedwidth
= 1)
zaxis=arrow(pos=(0,0,-3),axis=(0,0,6),color=(0,0,1),shaftwidth=0.05,fixedwidth
= 1)

for i in range(-5,6):
    for j in range(-5,6):
       
box(pos=(i*0.5,j*0.5,-0.025),axis=(0,0,-0.05),width=0.45,height=0.45,color=(0.8,0.2,0.1))

slidingbox=box(axis=(0,0,0.4),width=0.6,height=0.4,color=(0,1,0))

rate(100)

while 1:
    boxcontrol.interact()
    slidingbox.pos=(boxslider.value-2,1.5,0.2)

Re: [Visualpython-users] Line between two 3D points.

[<bre...@un...>]

I'm no expert, but wouldn't it be 

cylinder(pos=(x1,y1,z1), axis=(x2-x1,y2-y1,z2-z1))





"Doug Mair" <dou...@gm...> 
27/10/2008 08:40 AM

To
<vis...@li...>
cc

Subject
[Visualpython-users] Line between two 3D points.






Hi all,
 
What is the VPython code to draw a cylinder between two arbitrary 3D 
points?
 
I'm looking for an equivalent to the Windows GDI:
    line(x1, y1, x2, y2), but in 3d.
 
Maybe    Line(x1, y1, z1, x2, y2, z2)  or  Line(point1=(x,y,z), 
point2=(x,y,z))
 
It seems that I would have to calculate the angle vector between the two 
points and use that as the axis.
 
Then I would have to calculate the distance between the two points.
 
Is there an easier way?   Sample code would help too.
 
Thanks,
Doug Mair

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