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annotate scripts/image/cubehelix.m @ 33596:96a203bc7e17 bytecode-interpreter tip

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maint: Merge default to bytecode-interpreter
author Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
date Fri, 17 May 2024 22:49:58 -0400
parents d8e5e55c3cf5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2014-2024 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{map} =} cubehelix ()
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28 ## @deftypefnx {} {@var{map} =} cubehelix (@var{n})
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29 ## @deftypefnx {} {@var{map} =} cubehelix (@var{n}, @var{start}, @var{rots}, @var{hue}, @var{gamma})
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30 ## Create cubehelix colormap.
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31 ##
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32 ## This colormap varies from black to white going though blue, green, and red
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33 ## tones while maintaining a monotonically increasing perception of intensity.
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34 ## This is achieved by traversing a color cube from black to white through
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35 ## a helix, hence the name cubehelix, while taking into account the perceived
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36 ## brightness of each channel according to the NTSC specifications from 1953.
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37 ##
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38 ## @example
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39 ## rgbplot (cubehelix (256))
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40 ## @end example
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41 ##
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42 ## The argument @var{n} must be a scalar.
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43 ## If @var{n} is not specified the length of the current colormap is used. If
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44 ## there is no current colormap the default value of 256 is used.
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45 ##
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46 ## Reference: Green, D. A., 2011,
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47 ## @cite{A @nospell{colour} scheme for the display of astronomical intensity
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48 ## images}, Bulletin of the Astronomical Society of India, 39, 289.
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49 ##
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50 ## @seealso{colormap}
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51 ## @end deftypefn
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52
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53 function map = cubehelix (n, start = 0.5, rots = -1.5, hue = 1, gamma = 1)
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54
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55 if (nargin > 0)
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56 if (! (isscalar (n) && isreal (n) && n == fix (n)))
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57 error ("cubehelix: N must be a scalar integer");
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58 endif
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59 n = double (n);
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60 else
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61 hf = get (0, "currentfigure");
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62 if (! isempty (hf))
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63 n = rows (get (hf, "colormap"));
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64 else
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65 n = 256;
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66 endif
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67 endif
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68
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69 if (n > 1)
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70 coeff = [ -0.14861 -0.29227 1.97294
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71 1.78277 -0.90649 0.00000];
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72
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73 fract = ((0:n-1) / (n-1))';
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74 angle = 2 * pi * (start/3 + 1 + rots*fract);
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75 fract .^= gamma;
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76 amp = hue * fract .* (1-fract) /2;
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77 map = fract + amp .* ([cos(angle) sin(angle)] * coeff);
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78
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79 ## Clip values (only in case users have changed values of hue or gamma)
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80 map(map < 0) = 0;
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81 map(map > 1) = 1;
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82 elseif (n > 0)
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83 map = [0, 0, 0];
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84 else
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85 map = zeros (0, 3);
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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 ## A better demo of this colormap would be a 3-D plot in NTSC instead of
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92 ## RGB values. That would really show what this colormap is about.
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93 %!demo
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94 %! ## Show the 'cubehelix' colormap profile and as an image
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95 %! cmap = cubehelix (256);
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96 %! subplot (2, 1, 1);
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97 %! rgbplot (cmap, "composite");
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98 %! subplot (2, 1, 2);
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99 %! rgbplot (cmap);
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100
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101
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102 %!assert (size (cubehelix ()), [256, 3])
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103 %!assert (size (cubehelix (16)), [16, 3])
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104
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105 %!assert (cubehelix (1), [0,0,0])
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106 %!assert (cubehelix (true), double ([0,0,0]))
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107 %!assert (cubehelix (char (1)), double ([0,0,0]))
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108 %!assert (cubehelix (int32 (1)), double ([0,0,0]))
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109
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110 %!assert (cubehelix (0), zeros (0, 3))
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111 %!assert (cubehelix (-1), zeros (0, 3))
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112
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113 %!assert (cubehelix (2), [0, 0, 0; 1, 1, 1])
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114 %!assert ([cubehelix]([1,end],:), [0, 0, 0; 1, 1, 1])
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115
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116 %!shared a
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117 %! a = [0, 0, 0;
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118 %! 0.17004232121057959, 0.43679759647517287, 0.22372555555555556;
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119 %! 0.82995767878942041, 0.56320240352482713, 0.77627444444444445;
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120 %! 1, 1, 1];
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121
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Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
parents: 32632
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122 %!assert (cubehelix (4), a, eps)
dfb9b770ae77 Increase default colormap size to 256 colors, add colormap BISTs (bug #65010)
Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
parents: 32632
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123
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Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
parents: 32632
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124 %!shared # Clear shared varibles to avoid echo on unrelated test errors.
dfb9b770ae77 Increase default colormap size to 256 colors, add colormap BISTs (bug #65010)
Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
parents: 32632
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125
dfb9b770ae77 Increase default colormap size to 256 colors, add colormap BISTs (bug #65010)
Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
parents: 32632
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126 ## Input validation
32737
d8e5e55c3cf5 Tighten input validation for all colormaps (bug #65011).
Rik <rik@octave.org>
parents: 32653
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127 %!error <N must be a scalar integer> cubehelix ("foo")
d8e5e55c3cf5 Tighten input validation for all colormaps (bug #65011).
Rik <rik@octave.org>
parents: 32653
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128 %!error <N must be a scalar integer> cubehelix ([1, 2, 3])
d8e5e55c3cf5 Tighten input validation for all colormaps (bug #65011).
Rik <rik@octave.org>
parents: 32653
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129 %!error <N must be a scalar integer> cubehelix ({1, 2, 3})