visualpython-users

Re: [Visualpython-users] further improved copyobjects() and a label BUG?

[Jonathan B. <jbr...@ea...>]

On Sun, 2003-09-28 at 16:34, Rob Salgado wrote:
> My previous copyobjects() choked on curves [and labels].
> Here's an improved version which works with curves.
> See below for a possible bug with the label object.
> 



> def copyobjects(scene1,scene2):
>     # based on http://www.vpython.org/webdoc/visual/options.html
>     # Copy all Visual objects from scene1 into scene2
>     scene2.select()
> 
>     scenelist=scene1.objects
>     ###
>     ### reverse() is needed so that the items in the destination list 
>     ### of objects are in correspondence those of the source list
>     scenelist.reverse()
>     
>     for obj in scenelist:
>         newobj = obj.__class__() # create object in scene2
> 
>         if obj.__class__== 'curve':          ###
>             for i in obj.pos:                ###
>                 newobj.append(pos=i)         ###
> 
>         for member in obj.__members__:
>             if member == 'display': continue # avoid putting into scene1
>             setattr(newobj,member,getattr(obj,member))
> 
> 
> This function now seems to work for all of the "Basic Display Objects"
> _except_ for the label object.
> 
> 
> BUG?

Maybe, maybe not.  

First off, only a handful of Python classes supply __members__ and
__methods__, so I'm not sure that we should be providing them at all.  I
think they are intruding on the interpreter's namespace, in much the
same way users should never define symbols with a leading _ in C (even
if several libraries do).

Secondly, if supporting an algorithm like that is all that they are
being used for, I think that there is a better solution.

Finally, I think that the above is a little hackish.  IMO the right
answer is to provide a copy constructor from C++.  Then, copyobjects()
looks like this:

def copyobjects( to_display, from_display):
	# Copies all displayobjects from from_display to to_display.
	
	displaylist = from_display.objects
	 # iterate across the list in reverse order.
	order.displaylist.reverse()
	for obj in scenelist:
		newobj = obj.__class__(obj)
		# newobj has identical properties to obj at this point.
		# Now move it to the new display.
		newobj.display = to_scene

Of course, that algorithm doesn't work right now, but it can with Boost
and a little effort on my part.

Comments?  Suggestions? 

Other than the purpose of copying objects' properties from one to
another, I am not aware of a good use for __methods__ and
__properties__.  What are you using them for?

-Jonathan Brandmeyer

[Visualpython-users] further improved copyobjects() and a label BUG?

[Rob S. <sa...@ph...>]

My previous copyobjects() choked on curves [and labels].
Here's an improved version which works with curves.
See below for a possible bug with the label object.


def copyobjects(scene1,scene2):
    # based on http://www.vpython.org/webdoc/visual/options.html
    # Copy all Visual objects from scene1 into scene2
    scene2.select()

    scenelist=scene1.objects
    ###
    ### reverse() is needed so that the items in the destination list 
    ### of objects are in correspondence those of the source list
    scenelist.reverse()
    
    for obj in scenelist:
        newobj = obj.__class__() # create object in scene2

        if obj.__class__== 'curve':          ###
            for i in obj.pos:                ###
                newobj.append(pos=i)         ###

        for member in obj.__members__:
            if member == 'display': continue # avoid putting into scene1
            setattr(newobj,member,getattr(obj,member))


This function now seems to work for all of the "Basic Display Objects"
_except_ for the label object.


BUG?
	It appears that the label fails to return the __members__
	attribute.  Browsing the source code, it seems that:

	in label.cpp,
	Object Label::getattr(const char* _attr) is missing the case
		if (attr == "__members__") ....
	as one finds in prim.cpp and arrprim.cpp.

Here's an example (which fails):


from visual import *

earth=sphere()
print earth.__class__
print dir(earth)
print earth.__dict__
print earth.__methods__
print earth.__members__

print "==================="

earthlabel = label(text='Our Earth')
print earthlabel.__class__
print dir(earthlabel)
print earthlabel.__dict__
print earthlabel.__methods__
print earthlabel.__members__



Rob Salgado

Re: [Visualpython-users] VPython compiling Problem!

[<eli...@t-...>]

Hi again,

The following lines contain the output written to my config.log during
"./configure"

... but this is just if you're interested in it!

Installing everything that the Development section of the Suse 8.2 package
contains helped and now everything seems to run fine!

thanks

Elias

configure:8434: checking GL
configure:8456: gcc -o conftest -g -O2   conftest.c  -L/usr/X11R6/lib -lgtk
-lgdk -lXi -lXext -lX11 -lm -lglib    -lGLU -lGL >&5
/usr/lib/gcc-lib/i486-suse-linux/3.3/../../../../i486-suse-linux/bin/ld:
cannot find -lGLU
collect2: ld returned 1 exit status
configure:8459: $? = 1
configure: failed program was:
#line 8437 "configure"
#include "confdefs.h"

#ifdef F77_DUMMY_MAIN
#  ifdef __cplusplus
     extern "C"
#  endif
   int F77_DUMMY_MAIN() { return 1; }
#endif
int
main ()
{
 char glBegin(); glBegin();
  ;
  return 0;
}
configure:8474: result: no
configure:8483: checking GL with threads
configure:8505: gcc -o conftest -g -O2   conftest.c  -L/usr/X11R6/lib -lgtk
-lgdk -lXi -lXext -lX11 -lm -lglib    -lGLU -lGL -lpthread >&5
/usr/lib/gcc-lib/i486-suse-linux/3.3/../../../../i486-suse-linux/bin/ld:
cannot find -lGLU
collect2: ld returned 1 exit status
configure:8508: $? = 1
configure: failed program was:
#line 8486 "configure"
#include "confdefs.h"

#ifdef F77_DUMMY_MAIN
#  ifdef __cplusplus
     extern "C"
#  endif
   int F77_DUMMY_MAIN() { return 1; }
#endif
int
main ()
{
char glBegin(); glBegin();
  ;
  return 0;
}
configure:8523: result: no
configure:8532: checking Mesa
configure:8554: gcc -o conftest -g -O2   conftest.c  -L/usr/X11R6/lib -lgtk
-lgdk -lXi -lXext -lX11 -lm -lglib    -lMesaGLU -lMesaGL >&5
/usr/lib/gcc-lib/i486-suse-linux/3.3/../../../../i486-suse-linux/bin/ld:
cannot find -lMesaGLU
collect2: ld returned 1 exit status
configure:8557: $? = 1
configure: failed program was:
#line 8535 "configure"
#include "confdefs.h"

#ifdef F77_DUMMY_MAIN
#  ifdef __cplusplus
     extern "C"
#  endif
   int F77_DUMMY_MAIN() { return 1; }
#endif
int
main ()
{
 char glBegin(); glBegin();
  ;
  return 0;
}
configure:8572: result: no
configure:8582: checking Mesa with pthreads
configure:8604: gcc -o conftest -g -O2   conftest.c  -L/usr/X11R6/lib -lgtk
-lgdk -lXi -lXext -lX11 -lm -lglib    -lMesaGLU -lMesaGL -lpthread >&5
/usr/lib/gcc-lib/i486-suse-linux/3.3/../../../../i486-suse-linux/bin/ld:
cannot find -lMesaGLU
collect2: ld returned 1 exit status
configure:8607: $? = 1
configure: failed program was:
#line 8585 "configure"
#include "confdefs.h"

#ifdef F77_DUMMY_MAIN
#  ifdef __cplusplus
     extern "C"
#  endif
   int F77_DUMMY_MAIN() { return 1; }
#endif
int
main ()
{
 char glBegin(); glBegin();
  ;
  return 0;
}
configure:8622: result: no
configure:8636: error: gtkglarea is required on Unix-like systems

Am Freitag, 26. September 2003 22:57 schrieb Jonathan Brandmeyer:
> On Fri, 2003-09-26 at 08:01, Elias Breunig wrote:
> > HI you guys,
> >
> > if have some trouble getting Vpython installed on my Suse 8.2 Pro laptop
> > with python 2.3
> >
> > the following failure appears during "./configure"
>
> snipped most of the tests
>
> > checking GL... no
> > checking GL with threads... no
> > checking Mesa... no
> > checking Mesa with pthreads... no
> > configure: error: gtkglarea is required on Unix-like systems
> > linux:/usr/local/src/visual-2.1.5 #
>
> The file config.log will contain a detailed description of these four
> failed tests, including the reason for failure.
>
> > ... but GL, MEsa and gtkgl libraries are installed!!!!!!!
>
> Make sure that you have the development versions of these libraries
> installed.  The package names are usually suffixed with something like
> -dev or -devel.
>
> Please post the relevant portion of config.log here so we can figure out
> the problem.  The important part starts at "configure:8434" and ends
> near "configure:8634"  It shouldn't actually be 200 lines, though.
>
> HTH,
> -Jonathan Brandmeyer
>
>
>
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users

--
Elias Breunig
Sankt Georg Str. 33
97199 Ochsenfurt

Tel.: 	09331 / 980946
Mobil.: 0160 / 96600820

Re: [Visualpython-users] VPython compiling Problem!

[Jonathan B. <jbr...@ea...>]

On Fri, 2003-09-26 at 08:01, Elias Breunig wrote:
> HI you guys,
> 
> if have some trouble getting Vpython installed on my Suse 8.2 Pro laptop with 
> python 2.3
> 
> the following failure appears during "./configure"
> 

snipped most of the tests

> checking GL... no
> checking GL with threads... no
> checking Mesa... no
> checking Mesa with pthreads... no
> configure: error: gtkglarea is required on Unix-like systems
> linux:/usr/local/src/visual-2.1.5 #

The file config.log will contain a detailed description of these four
failed tests, including the reason for failure.

> ... but GL, MEsa and gtkgl libraries are installed!!!!!!!

Make sure that you have the development versions of these libraries
installed.  The package names are usually suffixed with something like
-dev or -devel.

Please post the relevant portion of config.log here so we can figure out
the problem.  The important part starts at "configure:8434" and ends
near "configure:8634"  It shouldn't actually be 200 lines, though.

HTH,
-Jonathan Brandmeyer

[Visualpython-users] VPython compiling Problem!

[<eli...@t-...>]

HI you guys,

if have some trouble getting Vpython installed on my Suse 8.2 Pro laptop with 
python 2.3

the following failure appears during "./configure"

ejb@linux:~> su
Password:
linux:/home/ejb # cd /usr/local/src
linux:/usr/local/src # cd v*
linux:/usr/local/src/visual-2.1.5 # ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets ${MAKE}... yes
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for style of include used by make... GNU
checking dependency style of gcc... gcc3
checking whether gcc and cc understand -c and -o together... yes
checking how to run the C preprocessor... gcc -E
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking dependency style of g++... gcc3
checking whether make sets ${MAKE}... (cached) yes
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for ld used by GCC... /usr/i486-suse-linux/bin/ld
checking if the linker (/usr/i486-suse-linux/bin/ld) is GNU ld... yes
checking for /usr/i486-suse-linux/bin/ld option to reload object files... -r
checking for BSD-compatible nm... /usr/bin/nm -B
checking whether ln -s works... yes
checking how to recognise dependant libraries... pass_all
checking command to parse /usr/bin/nm -B output... ok
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking dlfcn.h usability... yes
checking dlfcn.h presence... yes
checking for dlfcn.h... yes
checking for ranlib... ranlib
checking for strip... strip
checking for objdir... .libs
checking for gcc option to produce PIC... -fPIC
checking if gcc PIC flag -fPIC works... yes
checking if gcc static flag -static works... yes
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.lo... yes
checking if gcc supports -fno-rtti -fno-exceptions... yes
checking whether the linker (/usr/i486-suse-linux/bin/ld) supports shared 
libraries... yes
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking dynamic linker characteristics... GNU/Linux ld.so
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no
checking whether -lc should be explicitly linked in... no
creating libtool
checking whether to enable maintainer-specific portions of Makefiles... no
checking for a Python interpreter with version >= 2.2... python
checking for python... /usr/bin/python
checking for python version... 2.3
checking for python platform... linux2
checking for array in python module Numeric... yes
checking for headers required to compile python extensions... found
checking for some Win32 platform... no
checking for some Mac OSX platform... no
checking for pkg-config... /usr/bin/pkg-config
checking for gtk+ >= 1.0... yes
checking GTK_CFLAGS... -I/usr/include/gtk-1.2 -I/usr/X11R6/include 
-I/usr/include/glib-1.2 -I/usr/lib/glib/include
checking GTK_LIBS... -L/usr/X11R6/lib -lgtk -lgdk -lXi -lXext -lX11 -lm -lglib
checking for gthread >= 1.0... yes
checking GTHREAD_CFLAGS... -D_REENTRANT -I/usr/include/glib-1.2 
-I/usr/lib/glib/include
checking GTHREAD_LIBS... -lgthread -lpthread -lglib
checking GL... no
checking GL with threads... no
checking Mesa... no
checking Mesa with pthreads... no
configure: error: gtkglarea is required on Unix-like systems
linux:/usr/local/src/visual-2.1.5 #

... but GL, MEsa and gtkgl libraries are installed!!!!!!!

Does anybody know how to fix that problem????

Elias

[Visualpython-users] an improved copyobjects()

[Rob S. <sa...@ph...>]

Here's an example of a program that,
first, copies objects between displays, 
then updates the copied objects periodically.

http://physics.syr.edu/~salgado/software/vpython/copyobjects-example.py


However, to make this work, I had to understand a subtlety in the 
copyobjects() function on  
http://www.vpython.org/webdoc/visual/options.html .

The following program demonstrates this.
http://physics.syr.edu/~salgado/software/vpython/copyobjects-subtlety.py


Essentially, I believe copyobjects() should traverse the
source-display's list in reverse as it builds up the destination-display
so that the items in the destination list of objects
are in correspondence with those of the source list.
With this, my naively written updatecopyobjects() function works.



Rob Salgado

Re: [Visualpython-users] pass by value?

[Gary P. <pa...@in...>]

I got around this the following way.  I don't know if it always works:

pos = shape.pos + vector(0,0,0)

actually, up top I define zed=vector(0,0,0) and I add zed whenever there's
danger of reference problems.

-g
----- Original Message ----- 
From: "Richard Chapman" <ax...@ch...>
To: "vpython" <vis...@li...>
Sent: Sunday, September 21, 2003 4:29 PM
Subject: [Visualpython-users] pass by value?


> hi
>
> how do you make sure a variable a vector in this case: is passed by value
as
> opposed to passed by reference.
>
> i have a class and in the class i have a list of positions, now i have a
> function called addposition which takes in a item called pos. in the
> function call i set pos=shape.pos, but when i move my shape.pos to
something
> else eg shape.pos + vector(1,1,1) it changes all the positions i entered
> into the list to this value.
>
> how do i stop this happening
>
> thanks
>
> richard

Re: [Visualpython-users] pass by value?

[Jonathan B. <jbr...@ea...>]

On Sun, 2003-09-21 at 16:29, Richard Chapman wrote:
> hi
> 
> how do you make sure a variable a vector in this case: is passed by value as
> opposed to passed by reference.
> 
> i have a class and in the class i have a list of positions, now i have a
> function called addposition which takes in a item called pos. in the
> function call i set pos=shape.pos, but when i move my shape.pos to something
> else eg shape.pos + vector(1,1,1) it changes all the positions i entered
> into the list to this value.
> 
> how do i stop this happening
> 
> thanks
> 
> richard

You can create a copy explicitly like this:

arr = arrow( pos=vector(1,2,3))
vec = vector( arr.pos)
arr.pos -= vector(1,0,0)

arr.pos will be equal to vector(0,2,3) and vec will equal vector(1,2,3).

HTH,
Jonathan Brandmeyer

[Visualpython-users] pass by value?

[Richard C. <ax...@ch...>]

hi

how do you make sure a variable a vector in this case: is passed by value as
opposed to passed by reference.

i have a class and in the class i have a list of positions, now i have a
function called addposition which takes in a item called pos. in the
function call i set pos=shape.pos, but when i move my shape.pos to something
else eg shape.pos + vector(1,1,1) it changes all the positions i entered
into the list to this value.

how do i stop this happening

thanks

richard

Re: [Visualpython-users] cant get the camera to perform traverse motion

[Jonathan B. <jbr...@ea...>]

On Sun, 2003-09-21 at 15:50, Richard Chapman wrote:
> hi
> 
> i am having difficultys trying to get the mouse to side step left and right,
> up and down with respect to the direction the camera is looking in.
> 
> 
> thanks for any help
> 
> rich

The mouse controls don't support moving side-to-side, only rotation and
zoom about the scene's center.  So, you need to adjust scene.center (a
vector) to the new center in your program.  Doing this in a series of
small steps will give the impression of continuous motion.  Using a
rate(30) will approximate the same frame rate as the rendering loop.

HTH,
Jonathan Brandmeyer

[Visualpython-users] cant get the camera to perform traverse motion

[Richard C. <ax...@ch...>]

hi

i am having difficultys trying to get the mouse to side step left and right,
up and down with respect to the direction the camera is looking in.


thanks for any help

rich

Re: [Visualpython-users] redblue stereo

[P H B. <P.H...@bh...>]

> 
> I've just ordered some glasses from 
> http://www.tedpella.com/photo_html/stereo.htm. A box of 10 red-blue 
> glasses is $4.50.
> 
> Bruce Sherwood
> 

Some years ago I bought inexpensive red/blue glasses from Karran Products,
Lightwater, Surrey, England. 

see http://www.karran.co.uk/Frames/b3d.html#anchor273342 

-- 
Dr P H Borcherds	|<mailto:P.H...@bh...>
			|phone 	0044 (0)121 475 3029

[Visualpython-users] Idle for VPython on *nix

[Jonathan B. <jbr...@ea...>]

An update is forthcoming for the Unix/Linux/Mac installation package
that affects users of Python 2.3.

Now that idlefork has merged back into the stock Python distribution,
there is no real need for the VPython-enhanced version of Idle. 
configure will detect if you have Python 2.3 installed, and will not
install IDLE_VPython if you do.  The helper script 'vpython' will
continue to be installed and will start the stock idle.

No changes will be made to your default Idle settings.

Users of Python 2.2.x should see no changes from the earlier installer,
and will receive no benefit from upgrading.

-Jonathan Brandmeyer

[Visualpython-users] Linux/Unix/MacOSX

[Bruce S. <bas...@un...>]

New installer for Linux/Unix/MacOSX at http//vpython.org, incorporating 
redblue stereo.

Bruce Sherwood

[Visualpython-users] redblue stereo

[Bruce S. <bas...@un...>]

As you know, John Zelle recently contributed code to support 'active' 
stereo (with shutter glasses) and 'passive' stereo (the two views are 
sent to two computer projectors which place polarized right-eye and 
left-eye views on a screen, to be viewed with polarized glasses). He 
also put hooks into the code to support 'redblue', the kind of stereo 
which one views with cheap red-blue glasses. However, the implementation 
was incomplete in that it required that you convert all object colors to 
grayscale for it to work. I've completed the implementation by doing the 
grayscale conversion automatically. If you print some object.color, you 
won't see any change; the conversion is done internally before 
displaying in red or blue.

So you can now say scene.stereo = 'redblue' (or 'redcyan' or 
'yellowblue') and get stereo with no special computer equipment. There 
is a new Windows installer available at http://vpython.org. Linux/Unix 
installer should follow in a day or two.

The grayscale conversion is this:

   s = ( .299 * r**GAMMA + .587 * g**GAMMA + .114 * b**GAMMA ) ** (1/GAMMA)
   color = (s,s,s)

This makes different colors show up as different grays, which is 
desirable. But notice that if the original colors were red or blue, the 
resulting gray will be rather dim. To get a brighter object in redblue 
stereo, use white as the original color.

I've just ordered some glasses from 
http://www.tedpella.com/photo_html/stereo.htm. A box of 10 red-blue 
glasses is $4.50.

Bruce Sherwood

Re: [Visualpython-users] using arrows in a class

[Jim V. <Jim...@no...>]

To further elaborate on Jonathan's request, for example:
s = pp._test
does not create an instance of the _test class, but
s = pp._test() # note parentheses
does -- at least as your example defines this class.

Jonathan Brandmeyer wrote:

> On Tue, 2003-09-16 at 17:57, Richard Chapman wrote:
> > hi
> >
> > okay i have a file called pp.py that has a class def in it
> >
> > class _test:
> >
> >       def __init__(self):
> >               self.arrow1 = arrow(...
> >               self.arrow2 = arrow(...
> >
> >       def move(self, step):
> >               self.arrow1.pos.x = self.arrow1.pos.x + step
> >               self.arrow2.pos.x = self.arrow2.pos.x + step
> >
> >
> > now back in another file in the same directory i have
> >
> > import pp
> >
> > #now i create instances of the class like this
> > s1 = pp._test
> > s2 = pp._test
> >
> >
> > #now i have a while loop
> > while 1==1:
> >       s1.move(step=-2)
> >       s2.move(step=2)
> >
> > now the problem i am having is that it is only showing s2's arrows, throwing
> > in some print statements in between sections of code sometimes i can get it
> > so that s1 arrows you see for a momentum, like flickering but a mostly not
> > displayed. like 10 seconds you dont see s1 and then for a second you do
> > where as s2 you see all the time, it seems almost as if s1 and s2 are
> > sharing the same arrows.
> >
> > How do i stop this from happening, how do i get s1 and s2 to be displayed
> > together/ solid not flicker how it does. what am i doing wrong.
> >
> >
> > Thank you for any help
> >
> > rich
> >
>
> Can you flesh this out to make a complete, reproducible example?  This
> one has syntax errors such that it is not completely clear what you are
> trying to demonstrate.
>
> -Jonathan Brandmeyer
>
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users

Re: [Visualpython-users] using arrows in a class

[Bruce S. <bas...@un...>]

The following test routine works for me. Note that in your note you 
wrote "s1 = pp._test" which should be "s1 = pp._test()". If this example 
doesn't address your problem, please submit a full test routine. I 
couldn't reproduce the behavior you describe.

from visual import *

class _test:
     def __init__(self):
         self.arrow1 = arrow(pos=(0,0,0), axis=(1,0,0), color=color.red)
         self.arrow2 = arrow(pos=(0,0,0), axis=(0,1,0), color=color.cyan)

     def move(self, step):
         self.arrow1.pos.x = self.arrow1.pos.x + step
         self.arrow2.pos.x = self.arrow2.pos.x + step

if __name__ == '__main__': # for testing the module
     #now i create instances of the class like this
     s1 = _test()
     s2 = _test()

     ###now i have a while loop
     while 1==1:
         rate(100)
         s1.move(step=-0.01)
         s2.move(step=0.01)

Richard Chapman wrote:

> hi
> 
> okay i have a file called pp.py that has a class def in it
> 
> class _test:
> 
> 	def __init__(self):
> 		self.arrow1 = arrow(...
> 		self.arrow2 = arrow(...
> 
> 	def move(self, step):
> 		self.arrow1.pos.x = self.arrow1.pos.x + step
> 		self.arrow2.pos.x = self.arrow2.pos.x + step
> 
> 
> now back in another file in the same directory i have
> 
> import pp
> 
> #now i create instances of the class like this
> s1 = pp._test
> s2 = pp._test
> 
> 
> #now i have a while loop
> while 1==1:
> 	s1.move(step=-2)
> 	s2.move(step=2)
> 
> now the problem i am having is that it is only showing s2's arrows, throwing
> in some print statements in between sections of code sometimes i can get it
> so that s1 arrows you see for a momentum, like flickering but a mostly not
> displayed. like 10 seconds you dont see s1 and then for a second you do
> where as s2 you see all the time, it seems almost as if s1 and s2 are
> sharing the same arrows.
> 
> How do i stop this from happening, how do i get s1 and s2 to be displayed
> together/ solid not flicker how it does. what am i doing wrong.
> 
> 
> Thank you for any help
> 
> rich
> 
> 
> 
> -------------------------------------------------------
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> Welcome to geek heaven.
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Re: [Visualpython-users] using arrows in a class

[Jonathan B. <jbr...@ea...>]

On Tue, 2003-09-16 at 17:57, Richard Chapman wrote:
> hi
> 
> okay i have a file called pp.py that has a class def in it
> 
> class _test:
> 
> 	def __init__(self):
> 		self.arrow1 = arrow(...
> 		self.arrow2 = arrow(...
> 
> 	def move(self, step):
> 		self.arrow1.pos.x = self.arrow1.pos.x + step
> 		self.arrow2.pos.x = self.arrow2.pos.x + step
> 
> 
> now back in another file in the same directory i have
> 
> import pp
> 
> #now i create instances of the class like this
> s1 = pp._test
> s2 = pp._test
> 
> 
> #now i have a while loop
> while 1==1:
> 	s1.move(step=-2)
> 	s2.move(step=2)
> 
> now the problem i am having is that it is only showing s2's arrows, throwing
> in some print statements in between sections of code sometimes i can get it
> so that s1 arrows you see for a momentum, like flickering but a mostly not
> displayed. like 10 seconds you dont see s1 and then for a second you do
> where as s2 you see all the time, it seems almost as if s1 and s2 are
> sharing the same arrows.
> 
> How do i stop this from happening, how do i get s1 and s2 to be displayed
> together/ solid not flicker how it does. what am i doing wrong.
> 
> 
> Thank you for any help
> 
> rich
> 

Can you flesh this out to make a complete, reproducible example?  This
one has syntax errors such that it is not completely clear what you are
trying to demonstrate.

-Jonathan Brandmeyer

[Visualpython-users] using arrows in a class

[Richard C. <ax...@ch...>]

hi

okay i have a file called pp.py that has a class def in it

class _test:

	def __init__(self):
		self.arrow1 = arrow(...
		self.arrow2 = arrow(...

	def move(self, step):
		self.arrow1.pos.x = self.arrow1.pos.x + step
		self.arrow2.pos.x = self.arrow2.pos.x + step


now back in another file in the same directory i have

import pp

#now i create instances of the class like this
s1 = pp._test
s2 = pp._test


#now i have a while loop
while 1==1:
	s1.move(step=-2)
	s2.move(step=2)

now the problem i am having is that it is only showing s2's arrows, throwing
in some print statements in between sections of code sometimes i can get it
so that s1 arrows you see for a momentum, like flickering but a mostly not
displayed. like 10 seconds you dont see s1 and then for a second you do
where as s2 you see all the time, it seems almost as if s1 and s2 are
sharing the same arrows.

How do i stop this from happening, how do i get s1 and s2 to be displayed
together/ solid not flicker how it does. what am i doing wrong.


Thank you for any help

rich

Re: [Visualpython-users] [vpython] deleting a curve

[Bruce S. <bas...@un...>]

See the online reference manual on deleting objects. To delete any 
Visual object, first make it invisible, then reuse the variable. It will 
be deleted by Python because there is no longer any way to reference it, 
neither by program reference nor by eye.

Bruce Sherwood

Chapman wrote:

> hi
> 
> i am having troubles with deleting a curve after i have drawn it on the
> screen and then reusing the variable to create a new curve
> 
> any help would be appreciated
> 
> rich
> 
> 
> 
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf
> _______________________________________________
> Visualpython-users mailing list
> Vis...@li...
> https://lists.sourceforge.net/lists/listinfo/visualpython-users

[Visualpython-users] New Linux/Unix installer

[Bruce S. <bas...@un...>]

There is now a new Linux/Unix installer which includes the new ellipsoid 
object from Shaun Press.

Bruce Sherwood

[Visualpython-users] [vpython] deleting a curve

[Chapman <ax...@ch...>]

hi

i am having troubles with deleting a curve after i have drawn it on the
screen and then reusing the variable to create a new curve

any help would be appreciated

rich

[Visualpython-users] Mac VPython installer

[Bruce S. <bas...@un...>]

I sent the following note to some colleagues but I think I failed to 
send it to the whole VPython mailing list as I had intended. Joe Heafner 
has kindly volunteered to look into making a Fink-based binary package. 
If anyone else has expertise and the willingness to give Joe a hand, 
please write to me, and I'll put all the interested parties in touch 
with each other.

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

As we've all seen, it takes heroic efforts to install VPython on Mac 
OSX, despite our partially successful efforts to simplify the situation. 
The real solution would be a binary installer, so that people don't have 
to install developer tools, do compiles, etc. Is there someone in the 
VPython community with the knowledge and capability to produce a binary 
installer? And/or a Fink package? This would be a big help. Thanks.

Bruce Sherwood

[Visualpython-users] [Fwd: yellowblue Stereo?]

[Bruce S. <bas...@un...>]

Rob Salgado makes an interesting suggestion, with links to relevant 
information. If we have redcyan as well as redblue, there's probably no 
reason not to also offer yellowblue.

-------- Original Message --------
Subject: yellowblue Stereo?
Date: Mon, 8 Sep 2003 23:14:19 -0400 (EDT)
From: Rob Salgado

I'm glad to see the stereo feature in VPython.
May I request that an additional option 'yellowblue' be included?

I've been playing around with the "ColorCode 3D" glasses
featured in a new IMAX movie. (See 
http://www.nwave.com/largeformat/e3d/colorcode/
for a description.)

This 'yellowblue' scheme seems to render many color scenes much better
than 'redblue'. (See
http://www.sledgeham.com/3dfilm/tvbottom.html
for a discussion.)

Rob Salgado

[Visualpython-users] [Fwd: Vpython and Boids]

[Bruce S. <bas...@un...>]

Eric Nilsen has contributed a "Boids" program, which you can find in the 
Contributed Programs section of http://vpython.org. Thanks, Eric!

-------- Original Message --------
Subject: Vpython and Boids
Date: Sun, 07 Sep 2003 20:00:01 -0500
From: Eric Nilsen <eri...@ea...>
To: bas...@un...

Bruce-
I recently downloaded Vpython and have really enjoyed using it.

Attached is a program I wrote for the "Boids" artificial life flocking
behavior.  I'd be happy to share this with the Vpython community.

Thanks!
-Eric Nilsen