visualpython-users

Re: [Visualpython-users] Window handler

[Arthur <ajs...@op...>]

dri...@gm... wrote:
>  
> Hi, guys,
> 
> As you know, one of the most successful aspect of Python is its
> extendibility (module support).
> 
> VPython should also follow this spirit, I think.
> Should there be a way to expose a window handler/render context to the user?

Again, Bruce and Jonathan seemed to have this very much in mind in 
architecting the 4.xxx series and, again, a lot of the infrastructure is 
there. Essentially a windowing API is getting exposed.

But, more generally, ..  Bruce's allusion to some delay in the release 
of 4.xxx as a final product is also related largely to issues with 
windowing code - particularly in respect the winapi code on Windows.  Of 
all the code of the VPython 4.xxx base this is probably the least finished.

The problem is that finishing the code takes someone interested in 
winapi code on Windows. Considering that Microsoft has lost most of its 
interest in it, its not surprising that such a person is hard to find.
And after trying some, I realize it is not I. Though we have gotten it 
past its most critical issues.

One thing being explored is cutting bait on the winapi code, and seeing 
about a crossplatform GTK build.  I am working - haven't had much time 
recently - on getting a coherent GTK build for Windows.  I expect to get 
there - but can't be sure.

Art

Re: [Visualpython-users] VPython render efficiency

[Arthur <ajs...@op...>]

driverz wrote:
> Thanks, Art,
> 
> got it! 
> So we just need to wait;)
> 
> By the way, I would like to remind the authors, the simplicity of vpython
> is vital! Do not lose it when you are trying to provide more!
> (you are working on adding lighting, texture, transparency...)
> It looks like a real 3D game engine more and more. Be careful!
> 
> Keep VPython simple to use and fast enough, please!
> 

I think this is good advice. I think day-to-day VPython needs little of 
the fancy graphics stuff, to the extent that it is at the expense of 
performance.  Bruce has been in touch with the original author of 
VPython, David Scherer, who, I think, expressed similar concerns.

OTOH, I think it would be nice if VPython could better step up to the 
plate for presentation purposes and do the fancy stuff, as well.  And I, 
who do geometric exploration with VPython - not write games, for example 
- find that transparency to be a great feature.  There is obvious 
benefit to not necessarily having objects hiding one another.

So, to me, its a matter of getting the defaults right.  And I think the 
general Python design philosophy is a good one to follow - which I think 
is always thinking about the trade-offs between simplicity, and putting 
power into the hands of the user to use as they will.

Art

[Visualpython-users] Window handler

[<dri...@gm...>]

 
Hi, guys,

As you know, one of the most successful aspect of Python is its
extendibility (module support).

VPython should also follow this spirit, I think.
Should there be a way to expose a window handler/render context to the user?

With them people can draw additional things in 2D/3D in to the same VPython
window.
e.g. integrate pygame and vpython.
Maybe , we are able to do this via win32api python module.

Can anybody give some instruction?

Ting

Re: [Visualpython-users] VPython render efficiency

[driverz <dri...@gm...>]

Thanks, Art,

got it! 
So we just need to wait;)

By the way, I would like to remind the authors, the simplicity of vpython
is vital! Do not lose it when you are trying to provide more!
(you are working on adding lighting, texture, transparency...)
It looks like a real 3D game engine more and more. Be careful!

Keep VPython simple to use and fast enough, please!

Ting 
 

-----Original Message-----
From: Arthur [mailto:ajs...@op...] 
Sent: Thursday, January 25, 2007 1:22 PM
To: Ting Li
Cc: vis...@li...
Subject: Re: [Visualpython-users] VPython render efficiency

Ting Li wrote:
> Hi, fans,
> 
> I'm a newbie.
> 
> VPython is really easy to use. But it looks too simple.
> I wonder if there is a parameter to customize the number of faces used 
> to draw a sphere (or cylinder ...)? I cannot find it. By default, 
> VPython draws a pretty smooth sphere, I guess the number of slice 
> should be larger than 50.

VPython adjusts level of detail for primitives like spheres and cylinders on
the fly based on distance from the camera.

But I agree that the general level of detail should be under user control.

I had pointed out to Bruce that the infrastructure to allow adjustment of
level of detail from the default (it would be on a scene by scene basis,not
a primitive by primitive bases) is already in the code, and that exposing it
to Python was trivial, and provided the code.

I've lost track of whether it was checked into CVS.

Bruce?

Art

Re: [Visualpython-users] VPython render efficiency

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

As Arthur says, he has been working on this, and will probably check it 
in to CVS himself (I've been buried under course startup issues). 
However, he's doing this work in the beta version, and it continues to 
look like a long process to get the beta version up to the point where 
it can be the standard version.

Bruce Sherwood

Arthur wrote:
> Ting Li wrote:
>   
>> Hi, fans,
>>
>> I'm a newbie.
>>
>> VPython is really easy to use. But it looks too simple.
>> I wonder if there is a parameter to customize the number of faces used
>> to draw a sphere (or cylinder ...)? I cannot find it. By default,
>> VPython draws a pretty smooth sphere, I guess the number of slice
>> should be larger than 50.
>>     
>
> VPython adjusts level of detail for primitives like spheres and 
> cylinders on the fly based on distance from the camera.
>
> But I agree that the general level of detail should be under user control.
>
> I had pointed out to Bruce that the infrastructure to allow adjustment 
> of level of detail from the default (it would be on a scene by scene 
> basis,not a primitive by primitive bases) is already in the code, and 
> that exposing it to Python was trivial, and provided the code.
>
> I've lost track of whether it was checked into CVS.
>
> Bruce?
>
> Art
>
>
> -------------------------------------------------------------------------
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>   

Re: [Visualpython-users] VPython render efficiency

[Arthur <ajs...@op...>]

Ting Li wrote:
> Hi, fans,
> 
> I'm a newbie.
> 
> VPython is really easy to use. But it looks too simple.
> I wonder if there is a parameter to customize the number of faces used
> to draw a sphere (or cylinder ...)? I cannot find it. By default,
> VPython draws a pretty smooth sphere, I guess the number of slice
> should be larger than 50.

VPython adjusts level of detail for primitives like spheres and 
cylinders on the fly based on distance from the camera.

But I agree that the general level of detail should be under user control.

I had pointed out to Bruce that the infrastructure to allow adjustment 
of level of detail from the default (it would be on a scene by scene 
basis,not a primitive by primitive bases) is already in the code, and 
that exposing it to Python was trivial, and provided the code.

I've lost track of whether it was checked into CVS.

Bruce?

Art

[Visualpython-users] VPython render efficiency

[Ting L. <dri...@gm...>]

Hi, fans,

I'm a newbie.

VPython is really easy to use. But it looks too simple.
I wonder if there is a parameter to customize the number of faces used
to draw a sphere (or cylinder ...)? I cannot find it. By default,
VPython draws a pretty smooth sphere, I guess the number of slice
should be larger than 50.

Sphere(pos=(*,*,*),color=color.red)

However, low polygon objects are needed. This control is necessary to
make smooth animation, especially when the number of objects is large.

I know VPython gives a way to build object by user, face.
But can the authors make life easier?

Another question is also about the rendering efficiency.
I don't know if VPython uses gllist internally. (sorry, haven't
studied the source) ,and if VPython support object 'instance'? (A
instance of an object doesn't need to rebuild the vertex array at a
new position but just copy the vertex from the original object and
perform translation, scale, or zoom. )

Ting

Re: [Visualpython-users] Clear points

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

The example below gives a strange curve on my computer. Apart from strange
(more or less systematic) variations there is a clear tendency that
plotting 500 points takes longer and longer time during the run. That's
another reason why I ask for a kind of 'clear points' command. How can I
change the program so that repeatingly plotting 500 points on the same
graph takes approximately the same time?

Yours,
Poul Riis

from time import *
from visual.graph import *
graph = gdisplay(title='Plotting 500 points several times',x=0, y=0,
width=600, xmin=0, xmax=500, height=100,foreground=color.black,
background=color.white)
countbar = ghbars(delta=10,color=color.blue)
countdot= gdots(color=color.red) 
graph1 = gdisplay(title='Time used to plot 500 points',x=0, y=100,
width=600, xmin=0, xmax=100, height=800,foreground=color.black,
background=color.white)
timegraph=gdots(color=color.red)
jmax=500
countbar.plot(pos=(jmax,5))
for i in range(1,100):
    if (i/2)*2==i:
        countdot.color=color.red
    else:
        countdot.color=color.green
    t1=clock()
    for j in range(1,jmax+1):
        countdot.plot(pos=(j,5))
    t2=clock()
    timegraph.plot(pos=(i,t2-t1))

Re: [Visualpython-users] Keyboard interrupt

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

If you're not writing a graphics program I think you just want to write=20
a pure Python program. I think you can find on the web tutorials on=20
simple Python programs that response to input.

Bruce Sherwood

Poul Riis wrote:
> Is there a smarter way to do the keyboard interrupt in the following
> example?
> I don't really need the window but if I make it invisible by uncommenti=
ng
> the 5th line the program doesn't work as before.=20
>=20
> Yours,
> Poul Riis
>=20
>=20
>=20
> from visual import *
> from time import *
> scene.width=3D25
> scene.height=3D25
> #scene.visible=3D0
> oldreadkey=3D0
>=20
> for i in range(1,10):
>     readkey=3Dscene.kb.keys
>     print i,readkey
>     if readkey!=3D0:
>         break
>     sleep(0.25)
> print "Once again..."
>=20
> oldreadkey=3Dreadkey
> for i in range(1,10):
>     readkey=3Dscene.kb.keys
>     print i,readkey
>     if readkey>oldreadkey:
>         break
>     sleep(0.25)
> print "Yet another time..."
>=20
> oldreadkey=3Dreadkey
> for i in range(1,10):
>     readkey=3Dscene.kb.keys
>     print i,readkey
>     if readkey>oldreadkey:
>         break
>     sleep(0.25)
> print "The end"
>=20
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
>=20
>=20
> ###########################################
> Denne meddelelse med evt. vedl=E6g  er scannet af SkoleKom ved hj=E6lp =
af F-Secure virusscanner.
>=20
> For yderligere information,
> http://forside.skolekom.dk/indhold/punkt1/viruspolitik
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
> -----------------------------------------------------------------------=
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> Take Surveys. Earn Cash. Influence the Future of IT
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 your
> opinions on IT & business topics through brief surveys - and earn cash
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>=20
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[Visualpython-users] Keyboard interrupt

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

Is there a smarter way to do the keyboard interrupt in the following
example?
I don't really need the window but if I make it invisible by uncommenting
the 5th line the program doesn't work as before. 

Yours,
Poul Riis



from visual import *
from time import *
scene.width=25
scene.height=25
#scene.visible=0
oldreadkey=0

for i in range(1,10):
    readkey=scene.kb.keys
    print i,readkey
    if readkey!=0:
        break
    sleep(0.25)
print "Once again..."

oldreadkey=readkey
for i in range(1,10):
    readkey=scene.kb.keys
    print i,readkey
    if readkey>oldreadkey:
        break
    sleep(0.25)
print "Yet another time..."

oldreadkey=readkey
for i in range(1,10):
    readkey=scene.kb.keys
    print i,readkey
    if readkey>oldreadkey:
        break
    sleep(0.25)
print "The end"

Re: [Visualpython-users] Clear points

[<wsw...@nc...>]

I have not tested it, but I think what would fix your problem is if you
added everything that you wanted to clear into a frame, and then just loo=
p
through the frame and set everything to not visible.  I've ran into the
same problems that you're facing and I've used this approach to fix it. (
Like with my pipes.py example on the vpython.org website )



>
> Could someone please correct (or comment on) the following (rather
> minimal) example. It runs without any error messages but there are some
> unwanted lines and trying to clear a graph by putting visble=3D0 doesn'=
t
> work.
>
> Yours
> Poul Riis
>
>
>
> from visual.graph import *
> from math import *
> from time import *
>
> graph =3D gdisplay(title=3D'Test',width=3D400,
> height=3D300,foreground=3Dcolor.black, background=3Dcolor.white)
> graphcurve=3D gcurve(color=3Dcolor.red)
>
> for i in range (0,360):
>     graphcurve.plot(pos=3D(i,sin(i/180.0*pi)))
>     sleep(0.005)
>
> #painting the curve white, thus clearing it:
> graphcurve.color=3Dcolor.white
> for i in range (0,360):
>     graphcurve.plot(pos=3D(i,sin(i/180.0*pi)))
>     sleep(0.005)
>
> #another curve in blue:
> graphcurve.color=3Dcolor.blue
> for i in range (0,360):
>     graphcurve.plot(pos=3D(i,cos(i/180.0*pi)))
>     sleep(0.005)
>
> #Hoping to clear the blue curve...:
> graphcurve.visible=3D0
> #Redrawing the curve in green:
> graphcurve.color=3Dcolor.green
> for i in range (0,360):
>     graphcurve.plot(pos=3D(i,cos(i/180.0*pi)))
>     sleep(0.005)
>
>
>
> ###########################################
> Denne meddelelse med evt. vedl=E6g  er scannet af SkoleKom ved hj=E6lp =
af
> F-Secure virusscanner.
>
> For yderligere information,
> http://forside.skolekom.dk/indhold/punkt1/viruspolitik
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> your
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>

Re: [Visualpython-users] Clear points

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

Could someone please correct (or comment on) the following (rather
minimal) example. It runs without any error messages but there are some
unwanted lines and trying to clear a graph by putting visble=0 doesn't
work.

Yours
Poul Riis



from visual.graph import *
from math import *
from time import *

graph = gdisplay(title='Test',width=400,
height=300,foreground=color.black, background=color.white)
graphcurve= gcurve(color=color.red)

for i in range (0,360):
    graphcurve.plot(pos=(i,sin(i/180.0*pi)))
    sleep(0.005)

#painting the curve white, thus clearing it:    
graphcurve.color=color.white
for i in range (0,360):
    graphcurve.plot(pos=(i,sin(i/180.0*pi)))
    sleep(0.005)

#another curve in blue:    
graphcurve.color=color.blue
for i in range (0,360):
    graphcurve.plot(pos=(i,cos(i/180.0*pi)))
    sleep(0.005)

#Hoping to clear the blue curve...:
graphcurve.visible=0
#Redrawing the curve in green:
graphcurve.color=color.green
for i in range (0,360):
    graphcurve.plot(pos=(i,cos(i/180.0*pi)))
    sleep(0.005)

Re: [Visualpython-users] Clear points

[<jam...@fd...>]

I use the next technique:

Examples:
#update plot population
        for dot in self.clgraph.dots:
            dot.visible=False
        self.clgraph.dots=[]
        del self.clgraph.dots
        del self.clgraph
        self.clgraph = gdots(gdisplay=self.clwindow)
        for cl in self.Population:
            col = color.white
            if cl.Relevance>0.0:
                col = color.red
            self.clgraph.plot(pos=cl.state,color=col)

        self.Gtrajectory.gcurve.visible = False
        del self.Gtrajectory
        self.Gtrajectory = gcurve(gdisplay=self.clwindow,color=color.yellow)



Hope this helps.
Kind regards...


============================================
Jose Antonio Martin H.
Departamento de Sistemas Informáticos y Computación
Facultad de Informática
Universidad Complutense de Madrid
Ciudad universitaria, 28040 Madrid
============================================

----- Original Message ----- 
From: "Poul Riis" <Pou...@sk...>
To: <vis...@li...>
Sent: Sunday, January 21, 2007 8:50 PM
Subject: [Visualpython-users] Clear points


> How can I clear points, lines and even horizontal bars in a graph window
> before redrawing?
>
> Yours,
> Poul Riis
>
>


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


>
>
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>
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>


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


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> 

Re: [Visualpython-users] Clear points

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

This isn't documented, so you need to look at the visual.graph module, 
but you'll find that these graphing objects are built on standard 
objects, so you can make them invisible. For example,

g = gcurve(....)
....
g.curve.visible = 0

The module should be revised to let you say directly g.visible = 0.

Bruce Sherwood

Poul Riis wrote:
> How can I clear points, lines and even horizontal bars in a graph window
> before redrawing?
> 
> Yours,
> Poul Riis

[Visualpython-users] Clear points

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

How can I clear points, lines and even horizontal bars in a graph window
before redrawing?

Yours,
Poul Riis

Re: [Visualpython-users] Physics engine for python 2.5

[Dethe E. <de...@li...>]

http://pyode.sourceforge.net/

Quoting from the site: "PyODE is a Python wrapper for the Open =20
Dynamics Engine, an open-source physics engine."

Not specific to Python 2.5, but should work with it, as far as I =20
know. It has Windows installers for Python versions 2.2 - 2.4.

--Dethe

On 19-Jan-07, at 7:16 AM, Jos=E9 Antonio Mart=EDn H wrote:

> Hi, Is there any physics engine for python 2.5 ?
>
> Indeed, this is not my main proble, I need to simulate a world with =20=

> a snake
> , so I need to calculate some physics like friction etc...
>
> thanks.
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Jose Antonio Martin H.
> Departamento de Sistemas Inform=E1ticos y Computaci=F3n
> Facultad de Inform=E1tica
> Universidad Complutense de Madrid
> Ciudad universitaria, 28040 Madrid
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>
> ----------------------------------------------------------------------=20=

> ---
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to =20
> share your
> opinions on IT & business topics through brief surveys - and earn cash
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Young children play in a way that is strikingly similar to the way =20
scientists work --Busytown News

[Visualpython-users] Physics engine for python 2.5

[<jam...@fd...>]

Hi, Is there any physics engine for python 2.5 ?

Indeed, this is not my main proble, I need to simulate a world with a snake 
, so I need to calculate some physics like friction etc...

thanks.
============================================
Jose Antonio Martin H.
Departamento de Sistemas Informáticos y Computación
Facultad de Informática
Universidad Complutense de Madrid
Ciudad universitaria, 28040 Madrid
============================================

[Visualpython-users] Moving the camera under program control

[Jeremy F. <Jer...@lo...>]

Hello !

I've got few questions about vpython.

I'm trying to build a little environnement in which i can control the camera 
with a program. Below that message is the code i wrote. This is largely 
inspired from stonehenge.py and display_kernel as advised on the list. It's 
working ... (i think) but i'm wondering if i'm doing it in the right way .... 
especially the things  like   :

old = scene.range [....] scene.range=old    .. i don't really understand what 
i'm doing there

and

using scene.up to compute the orth vector = norm(cross(forward,up)).  I 
thought the up vector was fixed .... to compute the orth vector that 
corresponds to a local horizontal axis for the camera, i should use a local 
up axis ... moving as i move my camera ?! am i wrong ?


What do you think about it ?

Thanks  !

Jeremy.


#!/usr/bin/env python

from visual import *

cylinder()

def rotate_camera(pan,tilt):
    old = scene.range
    newforward = rotate(scene.forward,axis=scene.up,angle=pan)
    scene.center = 
scene.mouse.camera+newforward*mag(scene.center-scene.mouse.camera)
    scene.forward = newforward
    scene.range = old
    orth = norm(cross( scene.forward,scene.up))
    newforward = rotate(scene.forward,axis = orth,angle=tilt)
    scene.center = 
scene.mouse.camera+newforward*mag(scene.center-scene.mouse.camera)
    scene.forward = newforward
    scene.range = old
   
while 1:
    # The camera is moved with the mouse and up,down,left,right keys
    if scene.kb.keys: # is there an event waiting to be processed?
        s = scene.kb.getkey() # obtain keyboard information
        if(s == 'up'):
            rotate_camera(0,0.1)
        elif(s=='down'):
            rotate_camera(0,-0.1)
        elif(s=='left'):
            rotate_camera(0.1,0)
        elif(s=='right'):
            rotate_camera(-0.1,0)

Re: [Visualpython-users] Fink trouble?

[Martin C. <cos...@wa...>]

Bruce Sherwood wrote:
> I've now had two colleagues at two different universities report that they don't find visual listed in Fink for Intel-based Macs. I do find it there on my Intel-based Mac. Any 
suggestions for what the problem could be?

My guess is that you have different definitions of "find visual listed". The Fink web package database has indeed a regrettable bug that doesn't show all the packages 
available in precompiled binary form. Thus visual-py24-3.2.9-1002-darwin-i386.deb has been available from the Fink bindist server since 09-June-2006, but it isn't 
shown via the web interface of that repository.

However, if you run the appropriate commands (fink selfupdate or apt-get update) on your intel Mac, and you ask that same local machine about the availability of the 
binary deb, it will show it.

And, of course, if you look at what versions are available for installation from source, you will always see a version for intel.

-- 
Martin

[Visualpython-users] Fink trouble?

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

I've now had two colleagues at two different universities report that 
they don't find visual listed in Fink for Intel-based Macs. I do find it 
there on my Intel-based Mac. Any suggestions for what the problem could be?

Bruce Sherwood

[Visualpython-users] Adobe' s opensource Boost patches

[Arthur <ajs...@op...>]

Came across this and thought it might be useful for those working with 
(struggling with) building vpython on the MAC.

Adobe's OpenSource (MIT license) ATL library makes extensive use of the 
Boost libraries, and they create their own Boost patches as they find 
necessary, until such time those patches find their way into the Boost 
distribution.

http://opensource.adobe.com/wiki/index.php/Annotated_List_of_Boost_Patches

The patch to darwin.jam looks extensive, and the patch to gcc.jam looks 
Apple specific.

The patched files themselves are apparently part of the ATL distribution
- which looks interesting in and of itself.

Hope this might be useful info.  Don't know for sure.

Art

Re: [Visualpython-users] Graph test

[<jam...@fd...>]

> If I omit the path command the error message reads:
> Traceback (most recent call last):
>  File "E:\python\Lib\site-packages\visual\examples\graphtest1.py", line
> 4, in <module>
>    from visual.graph import * # import graphing features
>  File "E:\python\visual\__init__.py", line 17, in <module>
>    import cvisual
> ImportError: No module named cvisual

Dear Poul  I really do not understant how you installed Vpython.

This is the standard way of a vphython installation, indeed for all packages
"E:\python\Lib\site-packages\visual\examples\graphtest1.py",
so , under Python\Lib\site-packages\visual   is the Vpython.

But then I do not understand, why you have another directory Python\Visual

This is strange, indeed, your Vpython installation must be under a directory 
named "visual" under \Lib\site-packages

What method did you used for installing Vpython ?

Are you on linux ?, windows ?

Re: [Visualpython-users] Graph test

[<jam...@fd...>]

Dear Poul, Why you append the path of visual ?
is it not enough to just import visual.graph ?


============================================
Jose Antonio Martin H.
Departamento de Sistemas Informáticos y Computación
Facultad de Informática
Universidad Complutense de Madrid
Ciudad universitaria, 28040 Madrid
============================================

----- Original Message ----- 
From: "Poul Riis" <Pou...@sk...>
To: <vis...@li...>
Sent: Saturday, January 06, 2007 10:10 AM
Subject: [Visualpython-users] Graph test


>I just tried the following small test program, taken from the VPython
> documentation (except that I've added the two first lines):
>
> import sys
> sys.path.append('e:/python/Lib/site-packages/visual')
>
> from visual.graph import * # import graphing features
>
> funct1 = gcurve(color=color.cyan) # a connected curve object
>
> for x in arange(0., 8.1, 0.1): # x goes from 0 to 8
>
>    funct1.plot(pos=(x,5.*cos(2.*x)*exp(-0.2*x))) # plot
>
> I get the following error message:
>
> Traceback (most recent call last):
>  File "E:/python/Lib/site-packages/visual/examples/graphtest1.py", line
> 4, in <module>
>    from visual.graph import * # import graphing features
>  File "E:\python\visual\__init__.py", line 21, in <module>
>    copy_reg.pickle(cvisual.VectorType, lambda v: (vector, tuple(v)),
> vector)
> AttributeError: 'module' object has no attribute 'VectorType'
>
> Is this a path problem or what can I do to make it work?
> I use the most recent (beta) version of VPyton.
>
> Yours
> Poul Riis
>
>


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[Visualpython-users] Graph test

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

I just tried the following small test program, taken from the VPython
documentation (except that I've added the two first lines):

import sys
sys.path.append('e:/python/Lib/site-packages/visual')

from visual.graph import * # import graphing features
 
funct1 = gcurve(color=color.cyan) # a connected curve object
 
for x in arange(0., 8.1, 0.1): # x goes from 0 to 8

    funct1.plot(pos=(x,5.*cos(2.*x)*exp(-0.2*x))) # plot

I get the following error message:

Traceback (most recent call last):
  File "E:/python/Lib/site-packages/visual/examples/graphtest1.py", line
4, in <module>
    from visual.graph import * # import graphing features
  File "E:\python\visual\__init__.py", line 21, in <module>
    copy_reg.pickle(cvisual.VectorType, lambda v: (vector, tuple(v)),
vector)
AttributeError: 'module' object has no attribute 'VectorType'

Is this a path problem or what can I do to make it work?
I use the most recent (beta) version of VPyton.

Yours
Poul Riis

[Visualpython-users] Memory Problems

[<jam...@fd...>]

Hi all, I have installed a new memory module in my PC.

all things seems to work ok, but when I run a Vpython program I get a system 
error:

Abnornal program termination  run time error python.exe


I am on WinXp, Python25, The last stable release of Visual.

What is happen ?
 any idea ?
thanks a lot.

============================================
Jose Antonio Martin H.
Departamento de Sistemas Informáticos y Computación
Facultad de Informática
Universidad Complutense de Madrid
Ciudad universitaria, 28040 Madrid
============================================