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plot_opt.m
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1996-09-28
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# Copyright (C) 1994, 1995 John W. Eaton
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with Octave; see the file COPYING. If not, write to the Free
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
# Originally written by Rick Niles <niles@axp745.gsfc.nasa.gov>.
function fmt = plot_opt (caller, opt)
# usage: fmt = plot_opt (caller, opt)
#
# Decode plot option strings.
#
# If OPT is a valid option string, return a string of the form "w l 2"
# ("with lines 2"). Uses abbreviations for the options to avoid
# overrunning gnuplot's command line buffer unnecessarily.
#
# 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 with "@" or "-@")
# "c" where c is one of ["r", "g", "b", "m", "c", "w"] colors.
#
# Special points formats:
#
# "+", "*", "o", "x" will display points in that style.
#
# The legend may be fixed to include the name of the variable
# plotted in some future version of Octave.
#
# The color line styles have the following meanings on terminals
# that support color.
#
# Number Gnuplot colors (lines)points style
# 1 red "*"
# 2 green "+"
# 3 blue "o"
# 4 magenta "x"
# 5 cyan house
# 6 brown there exists
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;
more = 1;
WITH = "w";
LINES = "l";
LINESPOINTS = "linesp";
BOXERRORBARS = "boxer";
BOXES = "boxes";
POINTS = "p";
DOTS = "d";
IMPULSES = "i";
STEPS = "s";
ERRORBARS = "e";
if (nargin != 2)
usage ("plot_opt (opt)");
endif
if (! isstr (opt))
error ("plot_opt: argument must be a string");
endif
while (more)
# First get next char.
if (max (size (opt)) > 1)
[char, opt] = sscanf (opt, "%c %s");
else
char = opt;
more = 0;
endif
# Now set flags based on char.
if (strcmp (char, "-"))
set_lines = 1;
elseif (strcmp (char, "."))
set_dots = 1;
elseif (strcmp (char, "@"))
set_points = 1;
elseif (strcmp (char, "^"))
set_impulses = 1;
elseif (strcmp (char, "L"))
set_steps = 1;
elseif (strcmp (char, "~"))
set_errbars = 1;
elseif (strcmp (char, "#"))
set_boxes = 1;
elseif (strcmp (char, "0") || strcmp (char, "1") ...
|| strcmp (char, "2") || strcmp (char, "3") ...
|| strcmp (char, "4") || strcmp (char, "5") ...
|| strcmp (char, "6") || strcmp (char, "7") ...
|| strcmp (char, "8") || strcmp (char, "9"))
if (set_color)
set_points = 1;
symbol = char;
set_symbol = 1;
else
color = char;
set_color = 1;
endif
elseif (strcmp (char, "r"))
set_color = 1;
color = "1";
elseif (strcmp (char, "g"))
set_color = 1;
color = "2";
elseif (strcmp (char, "b"))
set_color = 1;
color = "3";
elseif (strcmp (char, "m"))
set_color = 1;
color = "4";
elseif (strcmp (char, "c"))
set_color = 1;
color = "5";
elseif (strcmp (char, "w"))
set_color = 1;
color = "6";
elseif (strcmp (char, "*"))
set_points = 1;
set_symbol = 1;
symbol = "1";
elseif (strcmp (char, "+"))
set_points = 1;
set_symbol = 1;
symbol = "2";
elseif (strcmp (char, "o"))
set_points = 1;
set_symbol = 1;
symbol = "3";
elseif (strcmp (char, "x"))
set_points = 1;
set_symbol = 1;
symbol = "4";
else
error (sprintf ("%s: unrecognized format character %s", caller, char));
endif
endwhile
# Now create format string.
fmt = WITH;
if (set_lines)
if (set_points)
fmt = strcat (fmt, " ", LINESPOINTS);
else
fmt = strcat (fmt, " ", LINES);
endif
elseif (set_boxes)
if (set_errbars)
fmt = strcat (fmt, " ", BOXERRORBARS);
else
fmt = strcat (fmt, " ", BOXES);
endif
elseif (set_points)
fmt = strcat (fmt, " ", POINTS);
elseif (set_dots)
fmt = strcat (fmt, " ", DOTS);
elseif (set_impulses)
fmt = strcat (fmt, " ", IMPULSES);
elseif (set_steps)
fmt = strcat (fmt, " ", STEPS);
elseif (set_errbars)
fmt = strcat (fmt, " ", ERRORBARS);
endif
if (strcmp (fmt, WITH))
fmt = strcat (fmt, " ", LINES);
endif
if (set_color)
fmt = strcat (fmt, " ", color);
if (set_symbol)
fmt = strcat (fmt, " ", symbol);
endif
elseif (set_symbol)
fmt = strcat (fmt, " 1 ", symbol);
endif
endfunction