Re: [Visualpython-users] Freeze+Update a scene

[Bruce S. <Bru...@nc...>]

I'm not sure I understand the question. If you don't want continual 
autoscaling of a graph, just specify specific limits of the x and y axes 
before starting the plotting, by specifying these limits in creating a 
gdisplay object.

As to the autoscaling done in the graph machinery, rescaling isn't done 
for every plot. Rather, if the new values require rescaling, the 
rescaling is done about 1% larger than needed, so that there is a good 
chance that another rescale won't be required for a while.

Bruce Sherwood

Hans-Joachim Gurt wrote:
> Hi,
> 
> I noticed that the scene is updated & resized after every calculation.
> 
> The effect can be seen with just a small change (added print-statement)
> to one of the example programs, e.g.:
> 
> 
> from visual.graph import *
> 
> funct1 = gdots(color=color.red)
> funct2 = gvbars(delta=0.05, color=color.blue)
> 
> for x in arange(0.0, 10.10, 0.1):
>     y1 = 5.0 * cos(2.0*x) * exp(-0.2*x)
>     y2 = 4.0 * cos(0.5*x) * exp(-0.1*x)
>     print x, y1, y2			# causes short delay
>     funct1.plot(pos=( x,y1 )) 
>     funct2.plot(pos=( x,y2 )) 
> 
> 
> The scene is 'blown up' as new values are added.
> 
> It would be nice if there were commands to stop/restart updating 
> and forcing a refresh of the scene.
> 
> A similar request was on the mailinglist back in 2006-09
> "freezing the scene", but I found no followup to that posting.
> 
> 
> By(t)e,
>  HaJo Gurt