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Example of Dynamic Appearance of Locator in LocatorPane?

• To: mathgroup at smc.vnet.net
• Subject: [mg82443] Example of Dynamic Appearance of Locator in LocatorPane?
• From: "W. Craig Carter" <ccarter at mit.edu>
• Date: Sat, 20 Oct 2007 05:55:22 -0400 (EDT)

Does anyone have a short example of using Dynamic with 
LocatorPane Option for Appearance?

For example, I am trying to get this:

Manipulate[
  DynamicModule[{pos = {1, 1/2}},
   LocatorPane[Plot[Sin[x], {x, 0, 2 Pi}],
    Appearance -> (*immediate*)
     Dynamic[Graphics[Circle[pos, radius]]]]], {{radius, .2}, 0, 1}]

or this:

Manipulate[
  DynamicModule[{pos = {1, 1/2}},
   LocatorPane[Plot[Sin[x], {x, 0, 2 Pi}],
    Appearance :> (*delayed*)
     Dynamic[Graphics[Circle[pos, radius]]]]], {{radius, .2}, 0, 1}]

to work. I can get the locator to move, but I'd like to get 
it to shrink and use its radius to calcuate other things.


Thanks.

W. Craig Carter

• Follow-Ups:
  • Re: Example of Dynamic Appearance of Locator in LocatorPane?
    • From: "Ricardo Samad" <resamad@gmail.com>