--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/plot/__pltopt__.m	Thu Nov 17 04:23:41 1994 +0000
@@ -0,0 +1,214 @@
+# Copyright (C) 1994 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 do not 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