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MathGroup Archive 2007

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Re: Re: Reading Coordinates from Plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80188] Re: [mg80135] Re: Reading Coordinates from Plot
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Tue, 14 Aug 2007 07:10:40 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <f9mqlv$ri0$1@smc.vnet.net> <200708130837.EAA27841@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

I tried the same thing, in 3 separate Input cells, but with a Plot 
instead of a ListPlot:

   res={};

   Dynamic[res]

   EventHandler[
       Plot[Sin[x],{x,0,Pi}],{"MouseUp":>AppendTo[res,
          MousePosition["Graphics"]]}
   ]

However, at each mouse click-release it's tricky not to get that point's 
coordinates appearing twice in the list.  I think that "MouseDown" might 
be better there.

This is a promising technique.  Now to encapsulate it in a function that 
can be passed any 2D graphics....


rxm at inbox.com wrote:
> ::::::::: On Aug 12, 7:24 am, jrc <jrch... at mcn.net> wrote:
> :
> : Apparently v6.0.1 no longer has the mouse functionality that
> : enables one to easily read coordinates from a plot. <...deleted...>
> 
> I also missed the ability to read the data from plots.  Here
> is a cheap way to read mouse clicks
> 
> 	data = Table[RandomReal[], {10}];
> 
> 	res = {};
> 
> 	Dynamic[res]
> 
> 	EventHandler[
> 	 ListPlot[data], {"MouseUp" :> AppendTo[res,
> MousePosition["Graphics"]]}
> 	]
> 
> Enter each line in a different cell of the notebook.
> 
> Now, whenever you release the mouse button inside the plot
> area the output cell of Dynamic[res] will be updated with
> the position of the click.
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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