release-3-2-x: scripts/plot/axis.m@be84e9654feb

     1 ## Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2003, 2004,

     2 ##               2005, 2006, 2007, 2008, 2009 John W. Eaton

     3 ##

     4 ## This file is part of Octave.

     5 ##

     6 ## Octave is free software; you can redistribute it and/or modify it

     7 ## under the terms of the GNU General Public License as published by

     8 ## the Free Software Foundation; either version 3 of the License, or (at

     9 ## your option) any later version.

    10 ##

    11 ## Octave is distributed in the hope that it will be useful, but

    12 ## WITHOUT ANY WARRANTY; without even the implied warranty of

    13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14 ## General Public License for more details.

    15 ##

    16 ## You should have received a copy of the GNU General Public License

    17 ## along with Octave; see the file COPYING.  If not, see

    18 ## <http://www.gnu.org/licenses/>.

    20 ## -*- texinfo -*-

    21 ## @deftypefn {Function File} {} axis (@var{limits})

    22 ## Set axis limits for plots.

    23 ##

    24 ## The argument @var{limits} should be a 2, 4, or 6 element vector.  The

    25 ## first and second elements specify the lower and upper limits for the x

    26 ## axis.  The third and fourth specify the limits for the y-axis, and the

    27 ## fifth and sixth specify the limits for the z-axis.

    28 ##

    29 ## Without any arguments, @code{axis} turns autoscaling on.

    30 ##

    31 ## With one output argument, @code{x = axis} returns the current axes

    32 ##

    33 ## The vector argument specifying limits is optional, and additional

    34 ## string arguments may be used to specify various axis properties.  For

    35 ## example,

    36 ##

    37 ## @example

    38 ## axis ([1, 2, 3, 4], "square");

    39 ## @end example

    40 ##

    41 ## @noindent

    42 ## forces a square aspect ratio, and

    43 ##

    44 ## @example

    45 ## axis ("labely", "tic");

    46 ## @end example

    47 ##

    48 ## @noindent

    49 ## turns tic marks on for all axes and tic mark labels on for the y-axis

    50 ## only.

    51 ##

    52 ## @noindent

    53 ## The following options control the aspect ratio of the axes.

    54 ##

    55 ## @table @code

    56 ## @item "square"

    57 ## Force a square aspect ratio.

    58 ## @item "equal"

    59 ## Force x distance to equal y-distance.

    60 ## @item "normal"

    61 ## Restore the balance.

    62 ## @end table

    63 ##

    64 ## @noindent

    65 ## The following options control the way axis limits are interpreted.

    66 ##

    67 ## @table @code

    68 ## @item "auto"

    69 ## Set the specified axes to have nice limits around the data

    70 ## or all if no axes are specified.

    71 ## @item "manual"

    72 ## Fix the current axes limits.

    73 ## @item "tight"

    74 ## Fix axes to the limits of the data.

    75 ## @end table

    76 ##

    77 ## @noindent

    78 ## The option @code{"image"} is equivalent to @code{"tight"} and

    79 ## @code{"equal"}.

    80 ##

    81 ## @noindent

    82 ## The following options affect the appearance of tic marks.

    83 ##

    84 ## @table @code

    85 ## @item "on"

    86 ## Turn tic marks and labels on for all axes.

    87 ## @item "off"

    88 ## Turn tic marks off for all axes.

    89 ## @item "tic[xyz]"

    90 ## Turn tic marks on for all axes, or turn them on for the

    91 ## specified axes and off for the remainder.

    92 ## @item "label[xyz]"

    93 ## Turn tic labels on for all axes, or turn them on for the

    94 ## specified axes and off for the remainder.

    95 ## @item "nolabel"

    96 ## Turn tic labels off for all axes.

    97 ## @end table

    98 ## Note, if there are no tic marks for an axis, there can be no labels.

    99 ##

   100 ## @noindent

   101 ## The following options affect the direction of increasing values on

   102 ## the axes.

   103 ##

   104 ## @table @code

   105 ## @item "ij"

   106 ## Reverse y-axis, so lower values are nearer the top.

   107 ## @item "xy"

   108 ## Restore y-axis, so higher values are nearer the top.

   109 ## @end table

   110 ##

   111 ## If an axes handle is passed as the first argument, then operate on

   112 ## this axes rather than the current axes.

   113 ## @end deftypefn

   115 ## Author: jwe

   117 function varargout = axis (varargin)

   119   [h, varargin, nargin] = __plt_get_axis_arg__ ("axis", varargin{:});

   121   oldh = gca ();

   122   unwind_protect

   123     axes (h);

   124     varargout = cell (max (nargin == 0, nargout), 1);

   125     if (isempty (varargout))

   126       __axis__ (h, varargin{:});

   127     else

   128       [varargout{:}] = __axis__ (h, varargin{:});

   129     endif

   130   unwind_protect_cleanup

   131     axes (oldh);

   132   end_unwind_protect

   134 endfunction

   136 function curr_axis = __axis__ (ca, ax, varargin)

   138   if (nargin == 1)

   139     if (nargout == 0)

   140       set (ca, "xlimmode", "auto", "ylimmode", "auto", "zlimmode", "auto");

   141     else

   142       xlim = get (ca, "xlim");

   143       ylim = get (ca, "ylim");

   144       zlim = get (ca, "zlim");

   145       curr_axis = [xlim, ylim, zlim];

   146     endif

   148   elseif (ischar (ax))

   149     len = length (ax);

   151     ## 'matrix mode' to reverse the y-axis

   152     if (strcmpi (ax, "ij"))

   153       set (ca, "ydir", "reverse");

   154     elseif (strcmpi (ax, "xy"))

   155       set (ca, "ydir", "normal");

   157       ## aspect ratio

   158     elseif (strcmpi (ax, "image"))

   159       __axis__ (ca, "equal")

   160       __do_tight_option__ (ca);

   161     elseif (strcmpi (ax, "square"))

   162       if (__gnuplot_has_feature__ ("screen_coordinates_for_{lrtb}margin"))

   163         set (ca, "dataaspectratio", [1, 1, 1]);

   164       else

   165         x = xlim;

   166         y = ylim;

   167         set (ca, "dataaspectratio", [(y(2)-y(1)), (x(2)-x(1)), 1]);

   168       endif

   169     elseif  (strcmp (ax, "equal"))

   170       if (__gnuplot_has_feature__ ("screen_coordinates_for_{lrtb}margin"))

   171         x = xlim;

   172         y = ylim;

   173         set (ca, "dataaspectratio", [(x(2)-x(1)), (y(2)-y(1)), 1]);

   174       else

   175         set (ca, "dataaspectratio", [1, 1, 1]);

   176       endif

   177     elseif (strcmpi (ax, "normal"))

   178       set (ca, "dataaspectratiomode", "auto");

   180       ## axis limits

   181     elseif (len >= 4 && strcmpi (ax(1:4), "auto"))

   182       if (len > 4)

   183 	if (any (ax == "x"))

   184 	  set (ca, "xlimmode", "auto");

   185 	endif

   186 	if (any (ax == "y"))

   187 	  set (ca, "ylimmode", "auto");

   188 	endif

   189 	if (any (ax == "z"))

   190 	  set (ca, "zlimmode", "auto");

   191 	endif

   192       else

   193 	set (ca, "xlimmode", "auto", "ylimmode", "auto", "zlimmode", "auto");

   194       endif

   195     elseif (strcmpi (ax, "manual"))

   196       ## fixes the axis limits, like axis(axis) should;

   197       set (ca, "xlimmode", "manual", "ylimmode", "manual", "zlimmode", "manual");

   198     elseif (strcmpi (ax, "tight"))

   199       ## sets the axis limits to the min and max of all data.

   200       __do_tight_option__ (ca);

   201       ## tic marks

   202     elseif (strcmpi (ax, "on") || strcmpi (ax, "tic"))

   203       set (ca, "xtickmode", "auto", "ytickmode", "auto", "ztickmode", "auto");

   204       if (strcmpi (ax, "on"))

   205         set (ca, "xticklabelmode", "auto", "yticklabelmode", "auto",

   206 	   "zticklabelmode", "auto");

   207       endif

   208       set (ca, "visible", "on");

   209     elseif (strcmpi (ax, "off"))

   210       set (ca, "xtick", [], "ytick", [], "ztick", []);

   211       set (ca, "visible", "off");

   212     elseif (len > 3 && strcmpi (ax(1:3), "tic"))

   213       if (any (ax == "x"))

   214 	set (ca, "xtickmode", "auto");

   215       else

   216 	set (ca, "xtick", []);

   217       endif

   218       if (any (ax == "y"))

   219 	set (ca, "ytickmode", "auto");

   220       else

   221 	set (ca, "ytick", []);

   222       endif

   223       if (any (ax == "z"))

   224 	set (ca, "ztickmode", "auto");

   225       else

   226 	set (ca, "ztick", []);

   227       endif

   228     elseif (strcmpi (ax, "label"))

   229       set (ca, "xticklabelmode", "auto", "yticklabelmode", "auto",

   230 	   "zticklabelmode", "auto");

   231     elseif (strcmpi (ax, "nolabel"))

   232       set (ca, "xticklabel", "", "yticklabel", "", "zticklabel", "");

   233     elseif (len > 5 && strcmpi (ax(1:5), "label"))

   234       if (any (ax == "x"))

   235 	set (ca, "xticklabelmode", "auto");

   236       else

   237 	set (ca, "xticklabel", "");

   238       endif

   239       if (any (ax == "y"))

   240 	set (ca, "yticklabelmode", "auto");

   241       else

   242 	set (ca, "yticklabel", "");

   243       endif

   244       if (any (ax == "z"))

   245 	set (ca, "zticklabelmode", "auto");

   246       else

   247 	set (ca, "zticklabel", "");

   248       endif

   250     else

   251       warning ("unknown axis option '%s'", ax);

   252     endif

   254   elseif (isvector (ax))

   256     len = length (ax);

   258     if (len != 2 && len != 4 && len != 6)

   259       error ("axis: expecting vector with 2, 4, or 6 elements");

   260     endif

   262     for i = 1:2:len

   263       if (ax(i) == ax(i+1))

   264 	error ("axis: limits(%d) cannot equal limits(%d)", i, i+1);

   265       endif

   266     endfor

   268     if (len > 1)

   269       set (ca, "xlim", [ax(1), ax(2)]);

   270     endif

   272     if (len > 3)

   273       set (ca, "ylim", [ax(3), ax(4)]);

   274     endif

   276     if (len > 5)

   277       set (ca, "zlim", [ax(5), ax(6)]);

   278     endif

   280   else

   281     error ("axis: expecting no args, or a vector with 2, 4, or 6 elements");

   282   endif

   284   if (! isempty (varargin))

   285     __axis__ (ca, varargin{:});

   286   endif

   288 endfunction

   290 function lims = __get_tight_lims__ (ca, ax)

   292   ## Get the limits for axis ("tight").

   293   ## AX should be one of "x", "y", or "z".

   294   kids = findobj (ca, "-property", strcat (ax, "data"));

   295   if (isempty (kids))

   296     ## Return the current limits.

   297     lims = get (ca, strcat (ax, "lim"));

   298   else

   299     data = get (kids, strcat (ax, "data"));

   300     if (iscell (data))

   301       lims(1) = min (cellfun (@min, data)(:));

   302       lims(2) = min (cellfun (@max, data)(:));

   303     else

   304       lims = [min(data(:)), max(data(:))];

   305     endif

   306   endif

   309 endfunction

   311 function __do_tight_option__ (ca)

   313   set (ca,

   314        "xlim", __get_tight_lims__ (ca, "x"),

   315        "ylim", __get_tight_lims__ (ca, "y"),

   316        "zlim", __get_tight_lims__ (ca, "z"));

   318 endfunction

   320 %!demo

   321 %! t=0:0.01:2*pi; x=sin(t);

   322 %!

   323 %! subplot(221);

   324 %! plot(t, x);

   325 %! title("normal plot");

   326 %!

   327 %! subplot(222);

   328 %! plot(t, x);

   329 %! title("square plot");

   330 %! axis("square");

   331 %!

   332 %! subplot(223);

   333 %! plot(t, x);

   334 %! title("equal plot");

   335 %! axis("equal");

   336 %!

   337 %! subplot(224);

   338 %! plot(t, x);

   339 %! title("normal plot again");

   340 %! axis("normal");

   342 %!demo

   343 %! t=0:0.01:2*pi; x=sin(t);

   344 %!

   345 %! subplot(121);

   346 %! plot(t, x);

   347 %! title("ij plot");

   348 %! axis("ij");

   349 %!

   350 %! subplot(122);

   351 %! plot(t, x);

   352 %! title("xy plot");

   353 %! axis("xy");

   355 %!demo

   356 %! t=0:0.01:2*pi; x=sin(t);

   357 %!

   358 %! subplot(331);

   359 %! plot(t, x);

   360 %! title("x tics and labels");

   361 %! axis("ticx");

   362 %!

   363 %! subplot(332);

   364 %! plot(t, x);

   365 %! title("y tics and labels");

   366 %! axis("ticy");

   367 %!

   368 %! subplot(333);

   369 %! plot(t, x);

   370 %! title("axis off");

   371 %! axis("off");

   372 %!

   373 %! subplot(334);

   374 %! plot(t, x);

   375 %! title("x and y tics, x labels");

   376 %! axis("labelx","tic");

   377 %!

   378 %! subplot(335);

   379 %! plot(t, x);

   380 %! title("x and y tics, y labels");

   381 %! axis("labely","tic");

   382 %!

   383 %! subplot(336);

   384 %! plot(t, x);

   385 %! title("all tics but no labels");

   386 %! axis("nolabel","tic");

   387 %!

   388 %! subplot(337);

   389 %! plot(t, x);

   390 %! title("x tics, no labels");

   391 %! axis("nolabel","ticx");

   392 %!

   393 %! subplot(338);

   394 %! plot(t, x);

   395 %! title("y tics, no labels");

   396 %! axis("nolabel","ticy");

   397 %!

   398 %! subplot(339);

   399 %! plot(t, x);

   400 %! title("all tics and labels");

   401 %! axis("on");

   403 %!demo

   404 %! t=0:0.01:2*pi; x=sin(t);

   405 %!

   406 %! subplot(321);

   407 %! plot(t, x);

   408 %! title("axes at [0 3 0 1]")

   409 %! axis([0,3,0,1]);

   410 %!

   411 %! subplot(322);

   412 %! plot(t, x);

   413 %! title("auto");

   414 %! axis("auto");

   415 %!

   416 %! subplot(323);

   417 %! plot(t, x, ";sine [0:2pi];"); hold on;

   418 %! plot(-3:3,-3:3, ";line (-3,-3)->(3,3);"); hold off;

   419 %! title("manual");

   420 %! axis("manual");

   421 %!

   422 %! subplot(324);

   423 %! plot(t, x, ";sine [0:2pi];");

   424 %! title("axes at [0 3 0 1], then autox");

   425 %! axis([0,3,0,1]); axis("autox");

   426 %!

   427 %! subplot(325);

   428 %! plot(t, x, ";sine [0:2p];");

   429 %! axis([3,6,0,1]); axis("autoy");

   430 %! title("axes at [3 6 0 1], then autoy");

   431 %!

   432 %! subplot(326);

   433 %! plot(t, x);

   434 %! axis("tight");

   435 %! title("tight");

   437 %!demo

   438 %! clf

   439 %! axis image

   440 %! x=0:0.1:10;

   441 %! plot(x,sin(x))

   442 %! axis image

   443 %! title("image")

author	Rik <rdrider0-list@yahoo.com>
	Wed May 27 13:06:38 2009 -0700 (2009-05-27)
changeset 9277	be84e9654feb
parent 9209	923c7cb7f13f
child 9319	d6052da689e2
permissions	-rw-r--r--