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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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