Re: [Visualpython-users] Uniform scaling with gdisplay

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

Bru...@nc... writes:
>so I assume you are asking whether there is a way to permit autoscaling
>but force the scale factors to be equal. 
Yes, that's what I want. I hope that someone can give me a hint on how to
do it. In the minimal example below I want the spiral to keep its shape
fixed, still autoscaling when points fall outside the actual window.

BTW, running the example results in the following error message on my
computer:
VPython WARNING: errors in shader program:
It does not seem to be fatal but I would like to know what the reason is
and how to get rid of it.


from visual import *
import visual.graph as visualgraph
from time import *

spiralgraph=visualgraph.gdisplay(title='Spiral', ytitle='x', xtitle='y',
                              x=0, y=0, width=800,
height=800,foreground=visualgraph.color.black,
background=visualgraph.color.white)
spiralplot =
visualgraph.gdots(color=visualgraph.crayola.blue,display=spiralgraph)

for i in range(0,3600):
    t=pi*i/360
    spiralplot.plot(pos=(t*cos(t),t*sin(t)))
    sleep(0.001)