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## Copyright (C) 2009 VZLU Prague, a.s.
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## This program is free software; you can redistribute it and/or modify it under
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## the terms of the GNU General Public License as published by the Free Software
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## Foundation; either version 3 of the License, or (at your option) any later
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## This program is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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## You should have received a copy of the GNU General Public License along with
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## this program; if not, see <http://www.gnu.org/licenses/>.
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## @deftypefn{Function File} colorboard (@var{m}, @var{palette}, @var{options})
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## Displays a color board corresponding to a numeric matrix @var{m}.
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## @var{m} should contain zero-based indices of colors.
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## The available range of indices is given by the @var{palette} argument,
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## which can be one of the following:
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## Black & white, using reverse video mode. This is the default if @var{m} is logical.
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## The standard ANSI 8 color palette. This is the default unless @var{m} is logical.
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## The AIXTerm extended 16-color palette. Uses codes 100:107 for bright colors.
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## The first 16 system colors of the Xterm 256-color palette.
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## The 6x6x6 color cube of the Xterm 256-color palette.
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## In this case, matrix can also be passed as a MxNx3 RGB array with values 0..5.
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## The 24 grayscale levels of the Xterm 256-color palette.
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## The full Xterm 256-color palette. The three above palettes together.
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## @var{options} comprises additional options. The recognized options are:
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## The number of spaces by which the board is indented. Default 2.
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## The number of spaces forming one field. Default 2.
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## @item "horizontalseparator"
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## The character used for horizontal separation of the table. Default "#".
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## @item "verticalseparator"
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## The character used for vertical separation of the table. Default "|".
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function colorboard (m, palette, varargin)
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nopt = length (varargin);
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switch (tolower (varargin{nopt-1}))
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indent = varargin{nopt};
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case "verticalseparator"
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vsep = varargin{nopt};
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case "horizontalseparator"
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hsep = varargin{nopt};
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error ("unknown option: %s", varargin{nopt-1});
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persistent digs = char (48:55); # digits 0..7
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colors = ["07"; "27"];
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colors = (["4"(i, 1), digs.']);
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colors = (["04"(i, :), digs.'; "10"(i, :), digs.']);
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colors = xterm_palette (0:15);
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colors = xterm_palette (16:231);
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if (size (m, 3) == 3)
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m = (m(:,:,1)*6 + m(:,:,2))*6 + m(:,:,3);
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colors = xterm_palette (232:255);
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colors = xterm_palette (0:255);
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error ("colorboard: invalid palette");
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persistent esc = char (27);
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escl = [esc, "["](ones (1, nc), :);
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escr = ["m", blanks(spc)](ones (1, nc), :);
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colors = [escl, colors, escr].';
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if (isreal (m) && max (m(:)) <= 1)
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m = min (floor (nc * m), nc-1);
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board = reshape (colors(:, m + 1), [], rm, cm);
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error ("colorboard: m is not a valid index into palette");
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board = permute (board, [2, 1, 3])(:, :);
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persistent reset = [esc, "[0m"];
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indent = blanks (indent);
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vline = [indent, hsep(1, ones (1, spc*cm+2))];
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hlinel = [indent, vsep](ones (1, rm), :);
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hliner = [reset, vsep](ones (1, rm), :);
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oldpso = page_screen_output (0);
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disp ([hlinel, board, hliner]);
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puts (reset); # reset terminal
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unwind_protect_cleanup
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page_screen_output (oldpso);
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function pal = xterm_palette (r)
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fmt = "48;5;%02d"; l = 7;
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fmt = "48;5;%03d"; l = 8;
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pal = reshape (sprintf (fmt, r), l, length (r)).';
added
removed
inst/colorboard.m
