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Re: Manipulate Issue - resend with code

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99653] Re: Manipulate Issue - resend with code
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sun, 10 May 2009 05:17:00 -0400 (EDT)
  • References: <gu3arm$t7i$1@smc.vnet.net>

Kevin J. McCann wrote:
> Below is the "Neat Example" from the Manipulate Help. My issue is that 
> when one of the charges is dragged around, the contour plot is really 
> crummy, i.e. very low res, until you take your finger off the mouse. 
> Similarly when the manipulate is allowed to run movie-style. Any ideas 
> about how to get this to "look nice"?
> 
> Thanks,
> 
> Kevin
> 
> 
> Manipulate[
>   ContourPlot[
>    q1/Norm[{x, y} - p[[1]]] + q2/Norm[{x, y} - p[[2]]], {x, -2,
>     2}, {y, -2, 2}, Contours -> 10], {{q1, -1}, -3, 3}, {{q2, 1}, -3,
>    3}, {{p, {{-1, 0}, {1, 0}}}, {-1, -1}, {1, 1}, Locator},
>   Deployed -> True]
> 


This is to speed up calculations and make the updating smoother while 
the parameters are changed (locators are dragged).  PerformanceGoal -> 
"Quality" may be specified in ContourPlot to force full-quality 
rendering, even while dragging.  But this is very slow on my computer. 
If you use this setting, you might consider turning off continuous 
updating completely, with SynchronousUpdating -> False in Manipulate.

http://reference.wolfram.com/mathematica/ref/$PerformanceGoal.html


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