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annotate scripts/image/jet.m @ 20614:10ec79b47808

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use new string_value method to handle value extraction errors * __voronoi__.cc, chol.cc, colamd.cc, fftw.cc: Use new string_value method.
author John W. Eaton <jwe@octave.org>
date Thu, 08 Oct 2015 18:15:56 -0400
parents 7503499a252b
children
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1 ## Copyright (C) 1999-2015 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} {@var{map} =} jet ()
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21 ## @deftypefnx {Function File} {@var{map} =} jet (@var{n})
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22 ## Create color colormap. This colormap ranges from dark blue through blue,
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23 ## cyan, green, yellow, red, to dark red.
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24 ##
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25 ## The argument @var{n} must be a scalar.
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26 ## If unspecified, the length of the current colormap, or 64, is used.
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27 ## @seealso{colormap}
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28 ## @end deftypefn
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29
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30 ## Author: Kai Habel <kai.habel@gmx.de>
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31
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32 ## PKG_ADD: colormap ("register", "jet");
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33 ## PKG_DEL: colormap ("unregister", "jet");
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34
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35 function map = jet (n = rows (colormap ()))
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36
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37 if (nargin > 1)
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38 print_usage ();
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39 elseif (! isscalar (n))
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40 error ("jet: N must be a scalar");
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41 endif
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42
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43 if (n == 1)
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44 map = [0, 1, 1];
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45 elseif (n == 2)
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46 map = [0, 0, 1
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47 0, 1, 1];
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48 elseif (n > 2)
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49 nel = ceil (n/4); # number of elements
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50 idx1 = ceil (3/8 * n) + 1; # ~3/8*n for large n
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51 if (mod (n, 8) == 2)
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52 idx1++;
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53 endif
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54 idx2 = idx1 + nel - 1; # ~5/8*n for large n
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55 idx3 = min (idx2 + nel, n); # ~7/8*n for large n
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56
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57 r = zeros (n, 1);
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58 r(idx1:idx2, 1) = [1:nel] / nel;
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59 r(idx2:idx3, 1) = 1;
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60 nel2 = n - idx3;
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61 r(idx3:(idx3+nel2), 1) = [nel:-1:(nel - nel2)] / nel;
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62
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63 idx1 = idx1 - nel; # ~1/8*n for large n
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64 idx2 = idx1 + nel - 1; # ~3/8*n for large n
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65 idx3 = min (idx2 + nel, n); # ~5/8*n for large n
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66
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67 g = zeros (n, 1);
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68 g(idx1:idx2, 1) = [1:nel] / nel;
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69 g(idx2:idx3, 1) = 1;
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70 nel2 = min (nel, n - idx3);
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71 g(idx3:(idx3+nel2), 1) = [nel:-1:(nel - nel2)] / nel;
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72
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73 idx1 = max (idx2 - nel, 1); # ~1/8*n for large n
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74 idx2 = idx2; # ~3/8*n for large n
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75 idx3 = idx3; # ~5/8*n for large n
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76
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77 b = zeros (n, 1);
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78 nel2 = min (nel, idx1-1);
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79 b(1:idx1, 1) = [(nel - nel2):nel] / nel;
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80 b(idx1:idx2, 1) = 1;
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81 nel2 = min (nel, n - idx3);
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82 b(idx2:(idx2+nel2), 1) = [nel:-1:(nel - nel2)] / nel;
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83
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84 map = [r, g, b];
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85 else
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86 map = zeros (0, 3);
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87 endif
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88
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89 endfunction
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90
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91
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92 %!demo
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93 %! ## Show the 'jet' colormap as an image
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94 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
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95 %! axis ([1, 64, 0, 1], "ticy", "xy");
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96 %! colormap (jet (64));
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97