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annotate scripts/plot/draw/contourf.m @ 20737:2d9ec16fa960

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Print error, rather than aborting, if mex function mxIsFromGlobalWS is used (bug #46070). * mex.cc (mxIsFromGlobalWS): Call mexErrMsgTxt rather than abort() in function.
author Rik <rik@octave.org>
date Tue, 29 Sep 2015 12:00:11 -0700
parents 777f26aa8e3e
children
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) 2007-2015 Kai Habel
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2 ## Copyright (C) 2003 Shai Ayal
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} contourf (@var{z})
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22 ## @deftypefnx {Function File} {} contourf (@var{z}, @var{vn})
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23 ## @deftypefnx {Function File} {} contourf (@var{x}, @var{y}, @var{z})
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24 ## @deftypefnx {Function File} {} contourf (@var{x}, @var{y}, @var{z}, @var{vn})
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25 ## @deftypefnx {Function File} {} contourf (@dots{}, @var{style})
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26 ## @deftypefnx {Function File} {} contourf (@var{hax}, @dots{})
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27 ## @deftypefnx {Function File} {[@var{c}, @var{h}] =} contourf (@dots{})
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28 ## Create a 2-D contour plot with filled intervals.
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29 ##
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30 ## Plot level curves (contour lines) of the matrix @var{z} and fill the region
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31 ## between lines with colors from the current colormap.
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32 ##
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33 ## The level curves are taken from the contour matrix @var{c} computed by
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34 ## @code{contourc} for the same arguments; see the latter for their
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35 ## interpretation.
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36 ##
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37 ## The appearance of contour lines can be defined with a line style @var{style}
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38 ## in the same manner as @code{plot}. Only line style and color are used;
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39 ## Any markers defined by @var{style} are ignored.
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40 ##
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41 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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42 ## rather than the current axes returned by @code{gca}.
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43 ##
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44 ## The optional output @var{c} contains the contour levels in @code{contourc}
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45 ## format.
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46 ##
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47 ## The optional return value @var{h} is a graphics handle to the hggroup
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48 ## comprising the contour lines.
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49 ##
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50 ## The following example plots filled contours of the @code{peaks} function.
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51 ##
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52 ## @example
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53 ## @group
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54 ## [x, y, z] = peaks (50);
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55 ## contourf (x, y, z, -7:9)
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56 ## @end group
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57 ## @end example
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58 ## @seealso{ezcontourf, contour, contourc, contour3, clabel, meshc, surfc, caxis, colormap, plot}
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59 ## @end deftypefn
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60
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61 ## Author: Kai Habel <kai.habel@gmx.de>
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62 ## Author: Shai Ayal <shaiay@users.sourceforge.net>
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63
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64 function [c, h] = contourf (varargin)
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65
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66 [hax, varargin] = __plt_get_axis_arg__ ("contour", varargin{:});
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67
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68 oldfig = [];
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69 if (! isempty (hax))
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70 oldfig = get (0, "currentfigure");
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71 endif
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72 unwind_protect
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73 hax = newplot (hax);
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74
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75 [ctmp, htmp] = __contour__ (hax, "none", "fill", "on",
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76 "linecolor", "black", varargin{:});
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77 unwind_protect_cleanup
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78 if (! isempty (oldfig))
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79 set (0, "currentfigure", oldfig);
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80 endif
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81 end_unwind_protect
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82
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83 if (nargout > 0)
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84 c = ctmp;
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85 h = htmp;
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86 endif
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87
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88 endfunction
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89
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90
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91 %!demo
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92 %! clf;
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93 %! colormap ('default');
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94 %! [x, y, z] = peaks (50);
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95 %! contourf (x, y, z, -7:9);
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96 %! title ({'contourf() plot (filled contour lines)'; 'Z = peaks()'});
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97
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98 %!demo
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99 %! clf;
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100 %! colormap ('default');
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101 %! [theta, r] = meshgrid (linspace (0,2*pi,64), linspace (0,1,64));
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102 %! [X, Y] = pol2cart (theta, r);
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103 %! Z = sin (2*theta) .* (1-r);
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104 %! contourf (X, Y, abs (Z), 10);
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105 %! title ({'contourf() plot'; 'polar fcn: Z = sin (2*theta) * (1-r)'});
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106
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107 %!demo
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108 %! clf;
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109 %! colormap ('default');
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110 %! x = linspace (-2, 2);
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111 %! [x, y] = meshgrid (x);
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112 %! z = sqrt (x.^2 + y.^2) ./ (x.^2 + y.^2 + 1);
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113 %! contourf (x, y, z, [0.4, 0.4]);
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114 %! title ('Hole should be filled with the background color');
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115