Re: [Visualpython-users] Userzoom

[Symion <kn...@ip...>]

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Hi there,<br>
&nbsp;&nbsp;&nbsp; I'm just answering my own question.<br>
The following program demonstrates 'the problem' and shows how I got
around it.<br>
<br>
Source Code: &nbsp; <a
 href="http://home.iprimus.com.au/knoware/webpage/Basic_0.py">Basic_0.py</a>&nbsp;
A simple 2D line drawer.<br>
<br>
This is not a problem with Vpython, but is related to My reliance on
the Default scene object and my attempts to<br>
preserve it. <br>
The solution is to instantiate new display object instead of trying to
reuse the old one.<br>
<br>
Symion
<br>
<br>
Symion wrote:
<blockquote cite="mid:4B1...@ip..." type="cite">Hi
there,<br>
&nbsp;&nbsp;&nbsp; I have been trying to reset a scene to its original settings and I
can not seem to be able to reset Userzoom input.<br>
The following snippet demonstrates my problem.<br>
If you run the code and spin the object around , then press any key!
The program will close down the scene and restart with Exactly the same
initial values.<br>
So far so good!<br>
Now zoom in or out and press any key!<br>
The zoom factor is not removed from the new scene, and I can not seem
to find any way to removing it!<br>
Bearing in mind that turning Userzoom off is not an option, could you
point me in the right direction?<br>
Any help would be appreciated.<br>
  <br>
'''Try to remove user zoom and spin components from scene<br>
  <br>
Control:<br>
Any key for next scene.<br>
esc to quit.'''<br>
  <br>
from visual import *<br>
  <br>
print __doc__<br>
i = 1<br>
while 1:<br>
&nbsp;&nbsp;&nbsp; scene.visible = False<br>
&nbsp;&nbsp;&nbsp; scene.width, scene.height, scene.title = 600, 600, 'Demo%01i' %(i)<br>
&nbsp;&nbsp;&nbsp; scene.forward = (0,0,-1) # Cancels previous Userspin component<br>
&nbsp;&nbsp;&nbsp; scene.range = 1 # Does NOT cancel previous Userzoom component!<br>
&nbsp;&nbsp;&nbsp; rate(2)<br>
&nbsp;&nbsp;&nbsp; scene.visible = True<br>
&nbsp;&nbsp;&nbsp; b = box()<br>
&nbsp;&nbsp;&nbsp; while scene.kb.keys==0:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rate(50)<br>
&nbsp;&nbsp;&nbsp; while scene.kb.keys&gt;0:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; kb = scene.kb.getkey()<br>
&nbsp;&nbsp;&nbsp; b.visible = False<br>
&nbsp;&nbsp;&nbsp; del b # Make sure object is Really gone<br>
&nbsp;&nbsp;&nbsp; i+= 1<br>
  <br>
  <br>
Symion
  <pre wrap="">  </pre>
</blockquote>
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