Re: Overlaying a grid on graphics to guide placement
- To: mathgroup at smc.vnet.net
- Subject: [mg73836] [mg73836] Re: [mg73785] Overlaying a grid on graphics to guide placement
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Fri, 2 Mar 2007 06:18:03 -0500 (EST)
- Reply-to: hanlonr at cox.net
You could use the GridLines option.
Needs["Graphics`"];
SetOptions[#,PlotStyle->Red,Frame->True,Axes->False,
PlotRange->{Automatic,{0.95,3.05}}]&/@
{Plot,LogLogPlot,LogLinearPlot};
DisplayTogetherArray[{
{LogLogPlot[Exp[-x+1],{x,0,1},
GridLines->Automatic],
LogLogPlot[Exp[-x+1],{x,0,1},
GridLines->{Table[10^-n,{n,0,5}],
Table[y,{y,1,3,.5}]}]},
{LogLinearPlot[Exp[-x+1],{x,0,1},
GridLines->Automatic],
LogLinearPlot[Exp[-x+1],{x,0,1},
GridLines->{Table[10^-n,{n,0,5}],Automatic}]},
{Plot[Exp[-x+1],{x,0,1},
GridLines->Automatic]}},
ImageSize->800];
Bob Hanlon
---- "Michael A. Gilchrist" <mikeg 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