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annotate scripts/plot/draw/contour.m @ 20177:15e5eb7a0c1d

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make dist: add updated zoom images to EXTRADIST (bug #44579) * libgui/graphics/module.mk: add graphics/images/zoom-in.png, graphics/images/zoom-out.png, remove graphics/images/zoom.png
author John Donoghue
date Thu, 19 Mar 2015 08:37:47 -0400
parents 4197fc428c7d
children 777f26aa8e3e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 1993-2015 Shai Ayal
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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} {} contour (@var{z})
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21 ## @deftypefnx {Function File} {} contour (@var{z}, @var{vn})
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22 ## @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z})
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23 ## @deftypefnx {Function File} {} contour (@var{x}, @var{y}, @var{z}, @var{vn})
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24 ## @deftypefnx {Function File} {} contour (@dots{}, @var{style})
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25 ## @deftypefnx {Function File} {} contour (@var{hax}, @dots{})
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26 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contour (@dots{})
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27 ## Create a 2-D contour plot.
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28 ##
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29 ## Plot level curves (contour lines) of the matrix @var{z}, using the
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30 ## contour matrix @var{c} computed by @code{contourc} from the same
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31 ## arguments; see the latter for their interpretation.
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32 ##
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33 ## The appearance of contour lines can be defined with a line style @var{style}
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34 ## in the same manner as @code{plot}. Only line style and color are used;
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35 ## Any markers defined by @var{style} are ignored.
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36 ##
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37 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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38 ## rather than the current axes returned by @code{gca}.
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39 ##
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40 ## The optional output @var{c} are the contour levels in @code{contourc} format.
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41 ##
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42 ## The optional return value @var{h} is a graphics handle to the hggroup
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43 ## comprising the contour lines.
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44 ##
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45 ## Example:
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46 ##
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47 ## @example
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48 ## @group
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49 ## x = 0:2;
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50 ## y = x;
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51 ## z = x' * y;
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52 ## contour (x, y, z, 2:3)
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53 ## @end group
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54 ## @end example
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55 ##
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56 ## @seealso{ezcontour, contourc, contourf, contour3, clabel, meshc, surfc, caxis, colormap, plot}
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57 ##
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58 ## @end deftypefn
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59
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60 ## Author: Shai Ayal <shaiay@users.sourceforge.net>
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61
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62 function [c, h] = contour (varargin)
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63
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64 [hax, varargin] = __plt_get_axis_arg__ ("contour", varargin{:});
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65
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66 oldfig = [];
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67 if (! isempty (hax))
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68 oldfig = get (0, "currentfigure");
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69 endif
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70 unwind_protect
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71 hax = newplot (hax);
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72
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73 [ctmp, htmp] = __contour__ (hax, "none", varargin{:});
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74 unwind_protect_cleanup
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75 if (! isempty (oldfig))
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76 set (0, "currentfigure", oldfig);
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77 endif
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78 end_unwind_protect
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79
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80 if (nargout > 0)
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81 c = ctmp;
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82 h = htmp;
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83 endif
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84
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85 endfunction
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86
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87
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88 %!demo
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89 %! clf;
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90 %! colormap ('default');
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91 %! [x, y, z] = peaks ();
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92 %! contour (x, y, z);
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93 %! title ({'contour() plot (isolines of constant Z)'; 'Z = peaks()'});
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94
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95 %!demo
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96 %! clf;
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97 %! colormap ('default');
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98 %! [theta, r] = meshgrid (linspace (0,2*pi,64), linspace (0,1,64));
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99 %! [X, Y] = pol2cart (theta, r);
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100 %! Z = sin (2*theta) .* (1-r);
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101 %! contour (X, Y, abs (Z), 10);
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102 %! title ({'contour() plot'; 'polar fcn: Z = sin (2*theta) * (1-r)'});
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103
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104 %!demo
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105 %! clf;
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106 %! colormap ('default');
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107 %! z = peaks ();
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108 %! contour (z, [0 0]);
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109 %! title ({'contour() plot with single isoline at Z == 0'; 'Z = peaks()'});
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110
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111 %!test
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112 %! hf = figure ("visible", "off");
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113 %! clf (hf);
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114 %! unwind_protect
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115 %! [x, y, z] = peaks ();
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116 %! [c, h] = contour (x, y, z);
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117 %! levellist = -6:6;
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118 %! set (h, "levellist", levellist);
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119 %! assert (get (h, "levellist"), levellist)
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120 %! assert (get (h, "levellistmode"), "manual")
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121 %! unwind_protect_cleanup
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122 %! close (hf);
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123 %! end_unwind_protect
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124
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125 %!test
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126 %! hf = figure ("visible", "off");
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127 %! clf (hf);
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128 %! unwind_protect
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129 %! [x, y, z] = peaks ();
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130 %! [c, h] = contour (x, y, z);
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131 %! levelstep = 3;
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132 %! set (h, "levelstep", levelstep);
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133 %! assert (get (h, "levelstep"), levelstep)
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134 %! assert (get (h, "levelstepmode"), "manual")
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135 %! assert (get (h, "levellist"), -6:levelstep:6)
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136 %! assert (get (h, "levellistmode"), "auto")
5ea6a6d2b83f Fix contour() listeners.
Ben Abbott <bpabbott@mac.com>
parents: 16814
diff changeset
137 %! unwind_protect_cleanup
5ea6a6d2b83f Fix contour() listeners.
Ben Abbott <bpabbott@mac.com>
parents: 16814
diff changeset
138 %! close (hf);
5ea6a6d2b83f Fix contour() listeners.
Ben Abbott <bpabbott@mac.com>
parents: 16814
diff changeset
139 %! end_unwind_protect
5ea6a6d2b83f Fix contour() listeners.
Ben Abbott <bpabbott@mac.com>
parents: 16814
diff changeset
140