/usr/share/plplot_octave/support/__pl_opt.m is in octave-plplot 5.9.9-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
## usage: fmt = __pl_opt__ (caller, opt)
##
## Decode plot option strings.
##
## OPT can currently be some combination of the following:
##
## "-" for lines plot style (default).
## "." for dots plot style.
## "@" for points plot style.
## "-@" for linespoints plot style.
## "^" for impulses plot style.
## "L" for steps plot style.
## "#" for boxes plot style.
## "~" for errorbars plot style.
## "#~" for boxerrorbars plot style.
## "n" with n in 1-6 (wraps at 8), plot color
## "nm" with m in 1-6 (wraps at 6), point style (only valid for "@" or "-@")
## "c" where c is one of ["r", "g", "b", "m", "c", "w"] colors.
## ";title;" where "title" is the label for the key.
## if title is blank, no label will be drawn
##
## Special points formats:
##
## ".", "+", "*", "o", "x" will display points in that style.
##
## The legend label text can be specified in between `;' characters, eg: ';x^2;'
## The special character `#' followed by another special character may be
## used for special text manipulation, eg ';x#u2#d;' print in `x^2' math,
## and `title("#gS#u5#d#dn=1#u") prints \sum_{n=1}^{5}.
##
## #u superscript, end with #d
## #d subscript, end with #u
## #b backspace
## ## # itself
## #+ toogle overline mode
## #- toogle underline mode
## #gx greek letter x
## #fn switch to normal font
## #fr switch to roman font
## #fi switch to italic font
## #fs switch to script font
## #(nnn) hershey character nnn
##
## For special fonts, the extended charset must be loaded first,
## use `plfontld(1)' to set, and `plfontld(0)' to return to normal.
##
## The colors, line styles, and point styles have the following
## meanings:
#
# y yellow . point
# m magenta o circle
# c cyan x x-mark
# r red + plus
# g green - solid
# b blue * star
# w white : dotted
# k black -. dashdot
# v violet -- dashed
# s salmon
#
# Symbols, from 0-9, are:
#
# 0 'square'
# 1 '.'
# 2 '+'
# 3 '*'
# 4 'o'
# 5 'x'
# 6 'square'
# 7 'triangle'
# 8 'cross-circle'
# 9 'dot-circle'.
#
# The PLplot colors are:
#
# 0. black (default background)
# 1. red
# 2. yellow
# 3. green
# 4. aquamarine
# 5. pink
# 6. wheat
# 7. grey
# 8. brown
# 9. blue
# 10. BlueViolet
# 11. cyan
# 12. turquoise
# 13. magenta
# 14. salmon
# 15. white (default foreground)
## Author: Rick Niles <niles@axp745.gsfc.nasa.gov>
## Adapted-By: jwe
## Modified: jc
function [style, color, symbol, key_title] = __pl_opt (opt)
style = 2;
color = 20;
symbol = 21;
key_title = "";
set_color = 0;
set_symbol = 0;
set_lines = 0;
set_dots = 0;
set_points = 0;
set_impulses = 0;
set_steps = 0;
set_boxes = 0;
set_errbars = 0;
set_key = 0;
more_opts = 1;
if (nargin != 1)
usage ("__pl_opt (opt)");
endif
if (! ischar (opt))
error ("__pl_opt: argument must be a string");
endif
if isempty(opt)
return;
endif
while (more_opts)
## first get next char.
if (max (size (opt)) > 1)
## [char, opt] = sscanf (opt, "%c %s", "c");
char = opt(1);
opt = opt(2:length(opt));
else
char = opt;
more_opts = 0;
endif
## now set flags based on char.
if (char == "-")
set_lines = 1;
elseif (char == ".")
set_dots = 1;
set_symbol = 1;
symbol = 1;
elseif (char == "@")
set_points = 1;
elseif (char == "^")
set_impulses = 1;
elseif (char == "L")
set_steps = 1;
elseif (char == "~")
set_errbars = 1;
elseif (char == "#")
set_boxes = 1;
elseif (isdigit(char))
if (set_color)
set_points = 1;
symbol = str2num(char);
set_symbol = 1;
else
color = str2num(char);
set_color = 1;
endif
elseif (char == "r")
set_color = 1;
color = 1;
elseif (char == "g")
set_color = 1;
color = 3;
elseif (char == "b")
set_color = 1;
color = 9;
elseif (char == "m")
set_color = 1;
color = 13;
elseif (char == "c")
set_color = 1;
color = 11;
elseif (char == "w")
set_color = 1;
color = 15;
elseif (char == "k")
set_color = 1;
color = 0;
elseif (char == "s")
set_color = 1;
color = 14;
elseif (char == "v")
set_color = 1;
color = 10;
elseif (char == "y")
set_color = 1;
color = 2;
elseif (char == "*")
set_points = 1;
set_symbol = 1;
symbol = 3;
elseif (char == "+")
set_points = 1;
set_symbol = 1;
symbol = 2;
elseif (char == "o")
set_points = 1;
set_symbol = 1;
symbol = 4;
elseif (char == "x")
set_points = 1;
set_symbol = 1;
symbol = 5;
elseif (char == ";") # title mode
set_key = 1;
working = 1;
key_title = "";
while (working)
if (max (size (opt)) > 1)
char = opt(1);
opt = opt(2:length(opt));
else
char = opt;
if (char != ";")
error ("unfinished key label");
endif
more_opts = 0;
working = 0;
endif
if (char == ";")
working = 0;
else
if (isempty (key_title)) # needs this to avoid empty matrix warning.
key_title = char;
else
key_title = strcat (key_title, char);
endif
endif
endwhile
elseif (char == " ")
## whitespace -- do nothing.
else
error ("unrecognized format character: '%s'", char);
endif
endwhile
## now create format string.
if (set_lines)
if (set_points)
style = 1; # linespoints
else
style = 2; # lines
endif
elseif (set_boxes)
if (set_errbars)
style = 3; # boxerrorbars
else
style = 4; # boxes
endif
elseif (set_points)
style = 5; # points
elseif (set_dots)
style = 6; # dots
elseif (set_impulses)
style = 7; # impulses
elseif (set_steps)
style = 8; # steps
elseif (set_errbars)
style = 9; # errorbars
endif
endfunction
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