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Re: How show Locator point and its image under a function?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg79894] Re: [mg79866] How show Locator point and its image under a function?
*From*: Murray Eisenberg <murray at math.umass.edu>
*Date*: Wed, 8 Aug 2007 04:50:33 -0400 (EDT)
*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst
*References*: <200708070532.BAA12064@smc.vnet.net>
*Reply-to*: murray at math.umass.edu
I oversimplified my requirements...
Actually, I want to do more: I want to include a LocatorAutoCreate->All
option for the left-hand graphics portion so that as each point there is
clicked it remains there and its image in the right-hand graphics is
automatically shown an remains showing even as I click new points on the
left.
Murray Eisenberg wrote:
> The following code displays a fixed point and its image under a
> specified function f:
>
> f[{x_,y_}]:={2x+1,y+2}
> Module[{pt = {-1, 0.5}},
> Row[{
> Framed@Graphics[Point[pt], PlotRange -> 5],
> Framed@Graphics[Point[f[pt]], PlotRange -> 5]
> }]
> ]
>
> Now I want to have the point in the left-hand graphic to be dynamic,
> controlled by a Locator, and to have its changed image under the
> function to be shown in the right-hand graphic.
>
> The idea is something like the following (WRONG!) code:
>
> DynamicModule[{pts={{0,0}}},
> Row[{
> LocatorPane[Dynamic[pts],Graphics[{},PlotRange->5]],
> Graphics[Dynamic[f/@pts],PlotRange->5]
> }]
> ]
>
> That code produces error messages, "1 is not a Graphics primitive or
> directive", "2 is not a Graphics primitive or directive".
>
> How can it actually be done?
>
--
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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