RE: [Visualpython-users] Starting and stopping Vpython programs from Pythonwin

I think you are looking for

  scene.exit = 0
  while scene.visible:
     # do something
  print "Scene was closed by user"

Closing the program is the default behavior for the "close" button, but
it can easily be overridden with this method.  Setting scene.visible = 0
is the preferred way of closing a display programmatically.

Also, in writing functions such as histo, where you want the option to
use a specific existing display, I would recommend the following method
for dealing with displays:

def histo(stacked, data, scene=None):
  if scene is None: 
    scene = display()
  # Do plotting with scene
  # Do user interface loop

histo() will use its own display unless the user specifically provides
one.

Dave

> -----Original Message-----
> From: vis...@li... 
> [mailto:vis...@li...] On 
> Behalf Of Patrick Keogh
> Sent: Wednesday, December 04, 2002 12:05 AM
> To: vis...@li...
> Subject: [Visualpython-users] Starting and stopping Vpython 
> programs from Pythonwin
> 
> 
> As you probably know, if you just close a Vpython display 
> which was started from a program running under Pythonwin, it 
> causes Pythonwin to die, even after the program terminates.
> 
> So I had to "invent" a method of gracefully terminating a 
> Vpython program. Not too difficult I know, but having done 
> so, I thought I might as well share it. So here is a function 
> (a histogram plotter), with this capability.
> 
> #!/usr/bin/python
> #
> # Histo - plot a histogram of stacked cylinders using Vpython
> #
> # Author Patrick Keogh
> #
> from visual import *
> 
> def histo(stacked, data):
>     """ The second parameter which is passed is assumed to be 
> a sequence,
>     which has:
>         - The first element is a sequence of category labels
>         - The second element is a sequence of data series labels.
>         - The third element is a sequence of sequences of the 
> data values
>     """
> #
> # This try/except figures out if there is already a scene. If 
> not, it creates it. #
>     try:
>         type(scene)
>     except:
>         scene = display()
>         scene.show()
>     max_entries = len(data[0])
>     col = (color.red,color.blue,color.green,color.yellow)
>     data_array = []
>     for i in data[2]:
>         max_entries = max((max_entries, len(i)))
>     arrow(axis=(max_entries+1,0,0), shaftwidth=0.1, fixedwidth=1)
>     max_height = 0.0
>     for i in range(max_entries):
>         data_array.append([])
>         for j in range(len(data[2])):
>             data_array[i].append(data[2][j][i])
>         max_height=max((max_height,sum(data_array[i])))
>     arrow(axis=(0,10,0), shaftwidth=0.1, fixedwidth=1)
>     for j in range(len(data_array[0])):
> 
> label(pos=(-5,j*2,j*2),text=data[1][j],color=col[j],opacity=0,
> box=0,border=0
> )
>     for i in range(len(data_array)):
>         base = 0
>         for j in range(len(data_array[i])):
>             cyl_height = data_array[i][j]*10.0/max_height
>             if stacked:
>                 pos = (i+1,base,0)
>                 base = base + cyl_height
>             else:
>                 pos = (i+1,0,j*2)
>             axis = (0,cyl_height,0)
>             c = cylinder(pos=pos,axis=axis,radius=0.3,color=col[j])
>             c.label = "(" + data[0][i] + "," + 
> repr(data_array[i][j]) + ")"
>     scene.center = (len(data_array)/2,5,0)
>     again = 1
>     prev = None
> #
> # Apart from the standard zoom and rotate capabilities, we will add #
> #	Left click		= Set a new center
> #	Ctrl-C		= Exit
> #	Move over a bar	= Display the (x,y) label for the histogram bar
> #				  Note the "hack" of inserting 
> the label as an attribute of the
> cylinder
> #
>     while again:
>         while scene.mouse.events:
>             if scene.mouse.clicked:
>                 scene.center = scene.mouse.getclick().pos
>         if scene.kb.keys:
>             if scene.kb.getkey() == 'ctrl+c':
>                again = 0
>         if scene.mouse.pick <> None:
>             if prev <> scene.mouse.pick:
>                 try:
>                     l.visible = 0
>                 except:
>                     pass
>                 prev = scene.mouse.pick
>                 if prev.__class__ == cylinder:
>                     l = label(pos=scene.mouse.pos, 
> text=prev.label, box=0) # # If a control-c was entered, then 
> the while loop exits, and we close down the display and exit #
>     scene.hide()
>     del(scene)
> 
> 
> 
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