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Re: Can a Locator be Made to Track a Curve?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120724] Re: Can a Locator be Made to Track a Curve?
  • From: "Oleksandr Rasputinov" <oleksandr_rasputinov at hmamail.com>
  • Date: Sun, 7 Aug 2011 06:16:25 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j1im6k$co2$1@smc.vnet.net>

On Sat, 06 Aug 2011 07:15:48 +0100, Gregory Lypny  
<gregory.lypny at videotron.ca> wrote:

> Hello everyone,
>
> Can a locator be constrained so that it tracks a curve?
>
> Regards,
>
> Gregory
>

Yes:

f = Sin;
DynamicModule[{p = {0, f[0]}},
  Show[{
    Plot[f[x], {x, -Pi, Pi}],
    Graphics@
     Locator@Dynamic[
       p, (p = Through@{First, Composition[f, First]}@#) &]
    }]
  ]




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