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MathGroup Archive 2004

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Re: Re: Very basic question: Zoom into a 2-D plot with the mouse

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51429] Re: [mg51406] Re: Very basic question: Zoom into a 2-D plot with the mouse
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sun, 17 Oct 2004 03:05:19 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <ck87ph$9lv$1@smc.vnet.net> <200410141037.GAA14928@smc.vnet.net> <cknteh$5li$1@smc.vnet.net> <200410160820.EAA23690@smc.vnet.net>
  • Reply-to: murray at math.umass.edu
  • Sender: owner-wri-mathgroup at wolfram.com

Evidently, yes, a matter of definition.  I distinguish between the size 
of an image and the magnification used in the viewing window.

Look, for example, at mapquest.com  When you choose to zoom in or zoom 
out on a map there, you do not get a larger or smaller image, but rather 
an image of the SAME size but magnified by a factor > 1 or < 1 (around 
the center or some other specified point).

The same thing is the case in any graphing calculator.

Often, that's what folks want when they want to zoom in on a graph -- to 
examine some feature of it more closely, given the same viewing window 
physical space in which to view it.


AES/newspost wrote:
> In article <cknteh$5li$1 at smc.vnet.net>,
>  Murray Eisenberg <murray at math.umass.edu> wrote:
> 
> 
>>ImageSize does not change the PlotRange, hence does NOT have the effect 
>>of zooming in (or out) of a graphic.  When people speak of zoom in or 
>>zoom out, they ordinarily mean that the physical image size remains the 
>>same.
> 
> 
> Huh?  I think there's a semantics problem here.  If I replot a plot with 
> ImageSize tripled, the image size _on the screen_ is three times larger, 
> which is certainly what I think of as the "effect of zooming" in an 
> on-screen graphic, or as the "physical image size" of an on-screen 
> graphic.
> 
> 
> 

-- 
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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