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MathGroup Archive 2007

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Manipulate/Locator bug

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80040] Manipulate/Locator bug
  • From: Mariusz Jankowski <mjankowski at usm.maine.edu>
  • Date: Sat, 11 Aug 2007 02:08:34 -0400 (EDT)

Hi, a couple of weeks ago I posted a question about a LocatorPane 
problem I was seeing. Here is another manifestation of the same using 
the popular Manipulate command. This is a bug that may kill your kernel 
so beware.

Following the documentation I entered:


Manipulate[
  Framed[Graphics[]], {{u, {}}, Locator, LocatorAutoCreate -> All}]




Now, click once inside the frame - a Locator does *not* appear.

Click again, a Locator will appear as described in the documentation. 
Continue clicks and alt-clicks and everything seems to work.


Finally, go to the control button in the upper right-hand corner of the 
Manipulate panel and select Paste Snapshot. You will either kill the 
kernel or a DynamicModule expression will get pasted. In the latter case 
note the incorrect coordinates of the first element of the list of Locators.


Enjoy, Mariusz


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