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annotate scripts/image/image.m @ 19627:446c46af4b42 stable

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strip trailing whitespace from most source files * Makefile.am, NEWS, build-aux/common.mk, configure.ac, doc/Makefile.am, doc/doxyhtml/Makefile.am, doc/interpreter/Makefile.am, doc/interpreter/arith.txi, doc/interpreter/audio.txi, doc/interpreter/basics.txi, doc/interpreter/bugs.txi, doc/interpreter/container.txi, doc/interpreter/cp-idx.txi, doc/interpreter/data.txi, doc/interpreter/debug.txi, doc/interpreter/diagperm.txi, doc/interpreter/diffeq.txi, doc/interpreter/doccheck/README, doc/interpreter/doccheck/spellcheck, doc/interpreter/emacs.txi, doc/interpreter/errors.txi, doc/interpreter/eval.txi, doc/interpreter/expr.txi, doc/interpreter/external.txi, doc/interpreter/fn-idx.txi, doc/interpreter/func.txi, doc/interpreter/geometry.txi, doc/interpreter/geometryimages.m, doc/interpreter/gpl.txi, doc/interpreter/grammar.txi, doc/interpreter/gui.txi, doc/interpreter/image.txi, doc/interpreter/install.txi, doc/interpreter/interp.txi, doc/interpreter/interpimages.m, 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scripts/statistics/distributions/frnd.m, scripts/statistics/distributions/gamrnd.m, scripts/statistics/distributions/geornd.m, scripts/statistics/distributions/hygernd.m, scripts/statistics/distributions/kolmogorov_smirnov_cdf.m, scripts/statistics/distributions/laplace_cdf.m, scripts/statistics/distributions/laplace_pdf.m, scripts/statistics/distributions/logistic_cdf.m, scripts/statistics/distributions/logistic_pdf.m, scripts/statistics/distributions/lognrnd.m, scripts/statistics/distributions/nbincdf.m, scripts/statistics/distributions/nbininv.m, scripts/statistics/distributions/nbinpdf.m, scripts/statistics/distributions/nbinrnd.m, scripts/statistics/distributions/normrnd.m, scripts/statistics/distributions/poissinv.m, scripts/statistics/distributions/poissrnd.m, scripts/statistics/distributions/tinv.m, scripts/statistics/distributions/trnd.m, scripts/statistics/distributions/unidcdf.m, scripts/statistics/distributions/unidpdf.m, scripts/statistics/distributions/unidrnd.m, scripts/statistics/distributions/unifrnd.m, scripts/statistics/distributions/wblrnd.m, scripts/statistics/models/module.mk, scripts/statistics/tests/kruskal_wallis_test.m, scripts/strings/base2dec.m, scripts/strings/deblank.m, scripts/strings/dec2base.m, scripts/strings/dec2bin.m, scripts/strings/dec2hex.m, scripts/strings/mat2str.m, scripts/strings/ostrsplit.m, scripts/strings/regexptranslate.m, scripts/strings/str2num.m, scripts/strings/strcat.m, scripts/strings/strjoin.m, scripts/strings/strsplit.m, scripts/strings/strtok.m, scripts/strings/strtrim.m, scripts/strings/strtrunc.m, scripts/strings/substr.m, scripts/testfun/__run_test_suite__.m, scripts/testfun/speed.m, scripts/testfun/test.m, scripts/time/asctime.m, scripts/time/datenum.m, scripts/time/datevec.m, scripts/time/weekday.m, src/Makefile.am, test/Makefile.am, test/build-bc-overload-tests.sh, test/build-sparse-tests.sh, test/jit.tst, test/line-continue.tst: Strip trailing whitespace.
author John W. Eaton <jwe@octave.org>
date Tue, 20 Jan 2015 08:26:57 -0500
parents 3283ce934648
children 0e1f5a750d00
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d63878346099 maint: Update copyright notices for release.
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1 ## Copyright (C) 1994-2013 John W. Eaton
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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
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
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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
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
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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} {} image (@var{img})
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21 ## @deftypefnx {Function File} {} image (@var{x}, @var{y}, @var{img})
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22 ## @deftypefnx {Function File} {} image (@dots{}, "@var{prop}", @var{val}, @dots{})
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23 ## @deftypefnx {Function File} {} image ("@var{prop1}", @var{val1}, @dots{})
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24 ## @deftypefnx {Function File} {@var{h} =} image (@dots{})
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25 ## Display a matrix as an indexed color image.
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26 ##
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27 ## The elements of @var{img} are indices into the current colormap.
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28 ## @var{x} and @var{y} are optional 2-element vectors, @w{@code{[min, max]}},
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29 ## which specify the range for the axis labels. If a range is specified as
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30 ## @w{@code{[max, min]}} then the image will be reversed along that axis. For
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31 ## convenience, @var{x} and @var{y} may be specified as N-element vectors
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32 ## matching the length of the data in @var{img}. However, only the first and
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33 ## last elements will be used to determine the axis limits.
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34 ## @strong{Warning:} @var{x} and @var{y} are ignored when using gnuplot 4.0
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35 ## or earlier.
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36 ##
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37 ## Multiple property/value pairs may be specified for the image object, but
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38 ## they must appear in pairs.
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39 ##
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40 ## The optional return value @var{h} is a graphics handle to the image.
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41 ##
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42 ## Implementation Note: The origin (0, 0) for images is located in the
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43 ## upper left. For ordinary plots, the origin is located in the lower
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44 ## left. Octave handles this inversion by plotting the data normally,
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45 ## and then reversing the direction of the y-axis by setting the
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46 ## @code{ydir} property to @qcode{"reverse"}. This has implications whenever
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47 ## an image and an ordinary plot need to be overlaid. The recommended
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48 ## solution is to display the image and then plot the reversed ydata
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49 ## using, for example, @code{flipud (ydata)}.
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50 ##
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51 ## Calling Forms: The @code{image} function can be called in two forms:
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52 ## High-Level and Low-Level. When invoked with normal options, the High-Level
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53 ## form is used which first calls @code{newplot} to prepare the graphic figure
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54 ## and axes. When the only inputs to @code{image} are property/value pairs
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55 ## the Low-Level form is used which creates a new instance of an image object
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56 ## and inserts it in the current axes.
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57 ## @seealso{imshow, imagesc, colormap}
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58 ## @end deftypefn
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
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parents:
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59
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60 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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61 ## Created: July 1994
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62 ## Adapted-By: jwe
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63
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64 function h = image (varargin)
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65
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66 [hax, varargin, nargin] = __plt_get_axis_arg__ ("image", varargin{:});
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67
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68 chararg = find (cellfun ("isclass", varargin, "char"), 1, "first");
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69
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70 do_new = true;
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71 if (nargin == 0)
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72 img = imread ("default.img");
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73 x = y = [];
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74 elseif (chararg == 1)
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75 ## Low-Level syntax
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76 do_new = false;
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77 x = y = img = [];
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78 idx = find (strcmpi (varargin, "cdata"), 1);
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79 if (idx)
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80 img = varargin{idx+1};
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81 varargin(idx:idx+1) = [];
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82 endif
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83 idx = find (strcmpi (varargin, "xdata"), 1);
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84 if (idx)
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85 x = varargin{idx+1};
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86 varargin(idx:idx+1) = [];
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87 endif
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88 idx = find (strcmpi (varargin, "ydata"), 1);
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89 if (idx)
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90 y = varargin{idx+1};
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91 varargin(idx:idx+1) = [];
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92 endif
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93 elseif (nargin == 1 || chararg == 2)
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94 img = varargin{1};
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95 x = y = [];
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96 elseif (nargin == 2 || chararg == 3)
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97 print_usage ();
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98 else
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99 x = varargin{1};
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100 y = varargin{2};
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101 img = varargin{3};
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102 chararg = 4;
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103 endif
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104
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105 oldfig = [];
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106 if (! isempty (hax))
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107 oldfig = get (0, "currentfigure");
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108 endif
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109 unwind_protect
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110 if (do_new)
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111 hax = newplot (hax);
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112 elseif (isempty (hax))
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113 hax = gca ();
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114 endif
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115
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116 htmp = __img__ (hax, do_new, x, y, img, varargin{chararg:end});
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117
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118 unwind_protect_cleanup
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119 if (! isempty (oldfig))
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120 set (0, "currentfigure", oldfig);
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121 endif
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122 end_unwind_protect
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123
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124 if (nargout > 0)
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125 h = htmp;
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126 endif
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127
e8d953d03f6a [project @ 2007-11-26 20:42:09 by dbateman]
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128 endfunction
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129
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130 ## Generic image creation.
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131 ##
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132 ## The axis values corresponding to the matrix elements are specified in
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133 ## @var{x} and @var{y}. If you're not using gnuplot 4.2 or later, these
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134 ## variables are ignored.
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135
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136 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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137 ## Created: July 1994
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138 ## Adapted-By: jwe
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139
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140 function h = __img__ (hax, do_new, x, y, img, varargin)
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141
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142 ## FIXME: Hack for integer formats which use zero-based indexing
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143 ## Hack favors correctness of display over size of image in memory.
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144 ## True fix must be done in C++ code for renderer.
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145 if (ndims (img) == 2 && (isinteger (img) || islogical (img)))
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146 img = single (img) + 1;
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147 endif
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148
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149 if (! isempty (img))
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150
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151 if (isempty (x))
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152 x = [1, columns(img)];
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153 endif
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154
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155 if (isempty (y))
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156 y = [1, rows(img)];
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157 endif
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158
18443
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159 xdata = x([1, end])(:).'; # (:).' is a hack to guarantee row vector
4bfd44c15145 image.m: Fix axis limit bug when column vectors are used as x,y input (bug #41466).
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160 ydata = y([1, end])(:).';
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161
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162 if (numel (x) > 2 && numel (y) > 2)
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163 ## Test data for non-linear spacing which is unsupported
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164 tol = .01; # 1% tolerance. FIXME: this value was chosen without thought.
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165 dx = diff (x);
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166 dxmean = (max (x) - min (x)) / (numel (x) - 1);
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167 dx = abs ((abs (dx) - dxmean) / dxmean);
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168 dy = diff (y);
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169 dymean = (max (y) - min (y)) / (numel (y) - 1);
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170 dy = abs ((abs (dy) - dymean) / dymean);
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171 if (any (dx > tol) || any (dy > tol))
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172 warning (["image: non-linear X, Y data is ignored. " ...
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173 "IMG will be shown with linear mapping"]);
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174 endif
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175 endif
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176
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177 endif # ! isempty (img)
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178
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179 h = __go_image__ (hax, "cdata", img, "xdata", xdata, "ydata", ydata,
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180 "cdatamapping", "direct", varargin{:});
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181
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182 if (do_new && ! ishold (hax))
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183 ## Set axis properties for new images
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184
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185 if (! isempty (img))
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186 if (isscalar (get (hax, "children")))
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187 axis (hax, "tight");
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188 endif
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189
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190 if (ndims (img) == 3)
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191 if (isinteger (img))
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192 cls = class (img);
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193 mn = intmin (cls);
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194 mx = intmax (cls);
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195 set (hax, "clim", double ([mn, mx]));
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196 endif
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197 endif
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198
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199 endif # ! isempty (img)
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200
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201 set (hax, "view", [0, 90], "ydir", "reverse", "layer", "bottom");
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202
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203 endif # do_new
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204
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205 endfunction
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206
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207
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208 %!demo
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209 %! clf;
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210 %! colormap (jet (21));
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211 %! img = 1 ./ hilb (11);
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212 %! x = y = -5:5;
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213 %! subplot (2,2,1);
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214 %! h = image (x, y, img);
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215 %! ylabel ("limits = [-5.5, 5.5]");
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216 %! title ("image (x, y, img)");
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217 %! subplot (2,2,2);
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218 %! h = image (-x, y, img);
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219 %! title ("image (-x, y, img)");
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220 %! subplot (2,2,3);
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221 %! h = image (x, -y, img);
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222 %! title ("image (x, -y, img)");
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223 %! ylabel ("limits = [-5.5, 5.5]");
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224 %! subplot (2,2,4);
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225 %! h = image (-x, -y, img);
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226 %! title ("image (-x, -y, img)");
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227
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228 ## FIXME: Need %!tests for linear