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MathGroup Archive 2007

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Re: Overlaying a grid on graphics to guide placement

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73801] [mg73801] Re: Overlaying a grid on graphics to guide placement
  • From: bghiggins at ucdavis.edu
  • Date: Fri, 2 Mar 2007 05:59:07 -0500 (EST)
  • References: <es3j69$oe1$1@smc.vnet.net>

Why not use the option GridLines or FaceGrids for 3D plots?

Brian

On Feb 28, 1:48 am, "Michael A. Gilchrist" <m... at utk.edu> wrote:
> Hi,
>
> I'd like to develop a function which overlays a grid on a graphics such as
> a plot to help with the placement of additional graphics object through
> things like Epilog or Prolog.
>
> I've taken a stab at it below,
>
> (*construction of grid*)
> imax = jmax = 4;
> step = 0.25;
>
> hlines =
>      Table[{If[j == 0., Black, LightGray],
>          Line[{{-imax, j}, {imax, j}}]}, {j, -jmax, jmax, step}];
>
> vlines =
>      Table[{If[j == 0., Black, LightGray],
>          Line[{{ j, -imax}, {j, imax}}]}, {j, -jmax, jmax, step}];
>
> hlabels = Table[Text[j, {j, 0}, {1, 1.1}], {j, -jmax, jmax, 1}];
> vlabels = Table[Text[j, {0, j}, {1.1, 1}], {j, -jmax, jmax, 1}];
>
> grid = Join[hlines, vlines, hlabels, vlabels];
>
> (* ooh it looks good on its own*)
> Show[Graphics[grid]]
>
> (*not so good here*)
> LogLogPlot[Exp[-x + 1], {x, 0, 1},
>    Epilog -> grid]
>
> Plot[Exp[-x + 1], {x, 0, 1},
>    Epilog -> grid]
>
> Show[GraphicsArray[{
>        {LogLogPlot[Exp[-x + 1], {x, 0, 1},
>            DisplayFunction -> Identity]},
>        {Plot[Exp[-x + 1], {x, 0, 1},
>            DisplayFunction -> Identity]}}], Epilog -> grid]
>
> If you run these commands you'll see that my attempt is inelegant and it
> doesn't work very well.  Ideally, the grid would (a) adjust itself so that
> its boundaries are within the graphics object and (b) adjust the spacing
> and labeling so that the grid lines are frequent enough to be informative
> but not obscure the entire figure.
>
> If any one has any suggestions I'd greatly appreciate hearing them.
>
> Thanks in advance.
>
> Mike
>
> -----------------------------------------------------
> Department of Ecology & Evolutionary Biology
> 569 Dabney Hall
> University of Tennessee
> Knoxville, TN 37996-1610
>
> phone:(865) 974-6453
> fax:  (865) 974-6042
>
> web:http://eeb.bio.utk.edu/gilchrist.asp
> -----------------------------------------------------




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