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MathGroup Archive 2007

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Re: Motion

  • To: mathgroup at
  • Subject: [mg78401] Re: Motion
  • From: "Steve Luttrell" <steve at>
  • Date: Sat, 30 Jun 2007 06:09:48 -0400 (EDT)
  • References: <f62l97$cek$>

One of the very useful things about Manipulate is that it automatically 
invokes Dynamic where it is needed.

The code fragment below does the sort of thing that you want:


You can move the centre of the expanding bubble by clicking and dragging the 

Steve Luttrell
West Malvern, UK

"Tim Brophy" <timbrophy at> wrote in message 
news:f62l97$cek$1 at
> Hi everybody,
> I am trying to draw circles that will stay centered on a Locator and
> increase in size. I thought that this code might work. What am I
> doing wrong?
> DynamicModule[{p = {0, 0}},
>  LocatorPane[Dynamic[p],
>   Dynamic[
>    Animate[
>     Graphics[Circle[p, t], PlotRange -> {{-7, 7}, {-7, 7}}], {t, 0,
> 6}]]]]
> Tim Brophy

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