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annotate scripts/plot/draw/pcolor.m @ 17603:dcbab6f3e727

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pcolor.m: Use tight axis limits when x-values, y-values are integers. * scripts/plot/draw/pcolor.m: Test x,y values for being integers (such as from meshgrid) and set tight limits if found.
author Rik <rik@octave.org>
date Tue, 08 Oct 2013 08:50:06 -0700
parents 7bb76a22cde1
children 4975ccb0a916
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2007-2012 Kai Habel
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} pcolor (@var{x}, @var{y}, @var{c})
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21 ## @deftypefnx {Function File} {} pcolor (@var{c})
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22 ## @deftypefnx {Function File} {} pcolor (@var{hax}, @dots{})
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23 ## @deftypefnx {Function File} {@var{h} =} pcolor (@dots{})
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24 ## Produce a 2-D density plot.
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25 ##
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26 ## A @code{pcolor} plot draws rectangles with colors from the matrix @var{c}
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27 ## over the two-dimensional region represented by the matrices @var{x} and
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28 ## @var{y}. @var{x} and @var{y} are the coordinates of the mesh's vertices
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29 ## and are typically the output of @code{meshgrid}. If @var{x} and @var{y} are
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30 ## vectors, then a typical vertex is (@var{x}(j), @var{y}(i), @var{c}(i,j)).
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31 ## Thus, columns of @var{c} correspond to different @var{x} values and rows
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32 ## of @var{c} correspond to different @var{y} values.
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33 ##
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34 ## The values in @var{c} are scaled to span the range of the current
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35 ## colormap. Limits may be placed on the color axis by the command
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36 ## @code{caxis}, or by setting the @code{clim} property of the parent axis.
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37 ##
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38 ## The face color of each cell of the mesh is determined by interpolating
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39 ## the values of @var{c} for each of the cell's vertices; Contrast this with
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40 ## @code{imagesc} which renders one cell for each element of @var{c}.
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41 ##
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42 ## @code{shading} modifies an attribute determining the manner by which the
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43 ## face color of each cell is interpolated from the values of @var{c},
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44 ## and the visibility of the cells' edges. By default the attribute is
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45 ## @qcode{"faceted"}, which renders a single color for each cell's face with
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46 ## the edge visible.
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47 ##
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48 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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49 ## rather than the current axes returned by @code{gca}.
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50 ##
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51 ## The optional return value @var{h} is a graphics handle to the created
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52 ## surface object.
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53 ##
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54 ## @seealso{caxis, shading, meshgrid, contour, imagesc}
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55 ## @end deftypefn
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56
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57 ## Author: Kai Habel <kai.habel@gmx.de>
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58
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59 function h = pcolor (varargin)
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60
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61 [hax, varargin, nargin] = __plt_get_axis_arg__ ("pcolor", varargin{:});
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62
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63 if (nargin == 1)
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64 c = varargin{1};
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65 [nr, nc] = size (c);
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66 [x, y] = meshgrid (1:nc, 1:nr);
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67 z = zeros (nr, nc);
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68 elseif (nargin == 3)
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69 x = varargin{1};
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70 y = varargin{2};
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71 c = varargin{3};
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72 z = zeros (size (c));
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73 else
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74 print_usage ();
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75 endif
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76
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77 oldfig = [];
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78 if (! isempty (hax))
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79 oldfig = get (0, "currentfigure");
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80 endif
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81 unwind_protect
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82 hax = newplot (hax);
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83 htmp = surface (x, y, z, c);
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84
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85 set (htmp, "facecolor", "flat");
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86 if (! ishold ())
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87 set (hax, "view", [0, 90], "box", "on");
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88 ## FIXME: Maybe this should be in the general axis limit setting routine?
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89 ## When values are integers, want to use tight limits.
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90 if (all (x(:) == fix (x(:))))
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91 xlim ([min(x(:)), max(x(:))]);
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92 endif
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93 if (all (y(:) == fix (y(:))))
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94 ylim ([min(y(:)), max(y(:))]);
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95 endif
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96 endif
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97
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98 unwind_protect_cleanup
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99 if (! isempty (oldfig))
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100 set (0, "currentfigure", oldfig);
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101 endif
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102 end_unwind_protect
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103
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104 if (nargout > 0)
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105 h = htmp;
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106 endif
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107
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108 endfunction
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109
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110
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111 %!demo
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112 %! clf;
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113 %! colormap ('default');
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114 %! Z = peaks ();
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115 %! pcolor (Z);
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116 %! title ('pcolor() of peaks with facet shading');
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117
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118 %!demo
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119 %! clf;
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120 %! colormap ('default');
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121 %! [X,Y,Z] = sombrero ();
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122 %! [Fx,Fy] = gradient (Z);
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123 %! pcolor (X,Y,Fx+Fy);
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124 %! shading interp;
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125 %! axis tight;
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126 %! title ('pcolor() of peaks with interp shading');
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127