Re: [Visualpython-users] controls

[Jon S. <js...@so...>]

Greetings

I'm playing with visual.controls and want to mention 3 issues.
#######  Issue1:  I can't position the controls window.  Help?

######   Issue2: it is apparently impossible to subclass vpython 
objects.
######   
http://mail.python.org/pipermail/tutor/2002-November/018952.html

###### Issue3:
######  But I can simulate the effect I want by adding attributes 
(including methods) to an object. FYI.
######  (This should be documented shouldn't it?)  Comment?

These Issues are illustrated in the snippet below, which creates a 
variant slider that displays an ID and its current value.

Visual 3.0 -2003-10-05, Mac OSX 10.3

Comments welcome.

from visual.controls import *

#######  Issue1:  I can't position the controls window.
c=controls(x=800)  # Issue 1:
print c.display.x
####### this confirms that the value of 800 'took', but it has no 
consequence.  Help?

###### Issue2: it is apparently impossible to subclass vpython objects.
######   
http://mail.python.org/pipermail/tutor/2002-November/018952.html
######  (This should be documented shouldn't it?)  Comment?

###### Issue3:
######  But I can simulate the effect by adding attributes (including 
methods) to an object. FYI.
def jslider2(**args):
     self=slider(**args)
     #########  create the object, passing all arguments up to the 
"parent"
     self.label=label(display=c.display, pos=(self.pos[0] , 
self.pos[1]+self.length),  text=str(self.value), box=0 )

     #########  turn the optional attribute ID into the text of a label
     if 'ID' in args:
         self.ID=label(display=c.display, pos=self.pos,  
text=args['ID'], box=0 )

     #########  Create an internal function to
     def showVal(obj, intify=0):
         if intify:  obj.value=int(round(obj.value))
         obj.label.text=str(obj.value)

     ######### make showVal the "action" attribute
     self.action=lambda:showVal(self, intify=0)

     return self

if __name__=='__main__':
     scene.autoscale=0
     sph=sphere()
     b2=box(pos=(2,2))

     s22 = jslider2(ID='s2', pos=(-30,-50), width=7, length=50, 
axis=(0,1,0) )
     while 1:
         c.interact()
         sph.radius=1+s22.value