1######################################################################## 2## 3## Copyright (C) 2012-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {@var{map} =} lines () 28## @deftypefnx {} {@var{map} =} lines (@var{n}) 29## Create color colormap. This colormap is composed of the list of colors 30## in the current axes @qcode{"ColorOrder"} property. The default is blue, 31## orange, yellow, purple, green, light blue, and dark red. 32## 33## The argument @var{n} must be a scalar. 34## If unspecified, the length of the current colormap, or 64, is used. 35## @seealso{colormap} 36## @end deftypefn 37 38function map = lines (n) 39 40 hf = get (groot, "currentfigure"); 41 if (nargin > 1) 42 print_usage (); 43 elseif (nargin == 1) 44 if (! isscalar (n)) 45 error ("lines: N must be a scalar"); 46 endif 47 n = double (n); 48 else 49 if (! isempty (hf)) 50 n = rows (get (hf, "colormap")); 51 else 52 n = 64; 53 endif 54 endif 55 56 if (n == 1) 57 map = [0, 0, 1]; 58 elseif (n > 1) 59 hax = get (hf, "currentaxes"); 60 if (! isempty (hax)) 61 C = get (hax, "colororder"); 62 else 63 C = get (groot, "defaultaxescolororder"); 64 endif 65 nr = rows (C); 66 map = C(rem (0:(n-1), nr) + 1, :); 67 else 68 map = zeros (0, 3); 69 endif 70 71endfunction 72 73 74%!demo 75%! ## Show the 'lines' colormap profile and as an image 76%! cmap = lines (21); # default has 7 colors, therefore cycle 3 times 77%! subplot (2, 1, 1); 78%! rgbplot (cmap, "composite"); 79%! subplot (2, 1, 2); 80%! rgbplot (cmap); 81