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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## Undocumented internal function. |
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20 |
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21 ## Really decode plot option strings. |
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22 |
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23 ## Author: Rick Niles <niles@axp745.gsfc.nasa.gov> |
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24 ## Adapted-By: jwe |
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25 ## Maintainer: jwe |
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26 |
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27 function [options, valid] = __pltopt1__ (caller, opt, err_on_invalid) |
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28 |
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29 options = __default_plot_options__ (); |
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30 valid = true; |
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31 |
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32 more_opts = 1; |
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33 |
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34 if (nargin != 2 && nargin != 3) |
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35 print_usage (); |
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36 endif |
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37 |
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38 if (! ischar (opt)) |
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39 return; |
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40 endif |
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41 |
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42 have_linestyle = false; |
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43 have_marker = false; |
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44 |
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45 ## If called by __errplot__, extract the linestyle before proceeding. |
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46 if (strcmp (caller,"__errplot__")) |
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47 if (strncmp (opt, "#~>", 3)) |
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48 n = 3; |
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49 elseif (strncmp (opt, "#~", 2) || strncmp (opt, "~>", 2)) |
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50 n = 2; |
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51 elseif (strncmp (opt, "~", 1) || strncmp (opt, ">", 1) |
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52 || strncmp (opt, "#", 1)) |
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53 n = 1; |
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54 endif |
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55 options.linestyle = opt(1:n); |
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56 opt(1:n) = []; |
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57 have_linestyle = true; |
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58 endif |
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59 |
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60 while (! isempty (opt)) |
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61 if (strncmp (opt, "--", 2) || strncmp (opt, "-.", 2)) |
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62 options.linestyle = opt(1:2); |
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63 have_linestyle = true; |
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64 n = 2; |
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65 else |
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66 topt = opt(1); |
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67 n = 1; |
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68 if (topt == "-" || topt == ":") |
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69 have_linestyle = true; |
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70 options.linestyle = topt; |
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71 elseif (topt == "+" || topt == "o" || topt == "*" |
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72 || topt == "." || topt == "x" || topt == "s" |
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73 || topt == "d" || topt == "^" || topt == "v" |
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74 || topt == ">" || topt == "<" || topt == "p" |
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75 || topt == "h" || topt == "@") |
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76 have_marker = true; |
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77 ## Backward compatibility. Leave undocumented. |
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78 if (topt == "@") |
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79 topt = "+"; |
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80 endif |
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81 options.marker = topt; |
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82 ### Numeric color specs for backward compatibility. Leave undocumented. |
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83 elseif (topt == "k" || topt == "0") |
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84 options.color = [0, 0, 0]; |
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85 elseif (topt == "r" || topt == "1") |
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86 options.color = [1, 0, 0]; |
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87 elseif (topt == "g" || topt == "2") |
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88 options.color = [0, 1, 0]; |
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89 elseif (topt == "b" || topt == "3") |
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90 options.color = [0, 0, 1]; |
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91 elseif (topt == "y") |
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92 options.color = [1, 1, 0]; |
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93 elseif (topt == "m" || topt == "4") |
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94 options.color = [1, 0, 1]; |
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95 elseif (topt == "c" || topt == "5") |
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96 options.color = [0, 1, 1]; |
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97 elseif (topt == "w" || topt == "6") |
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98 options.color = [1, 1, 1]; |
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99 elseif (isspace (topt)) |
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100 ## Do nothing. |
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101 elseif (topt == ";") |
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102 t = index (opt(2:end), ";"); |
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103 if (t) |
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104 options.key = undo_string_escapes (opt(2:t)); |
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105 n = t+1; |
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106 else |
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107 if (err_on_invalid) |
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108 error ("%s: unfinished key label", caller); |
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109 else |
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110 valid = false; |
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111 options = __default_plot_options__ (); |
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112 return; |
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113 endif |
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114 endif |
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115 else |
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116 if (err_on_invalid) |
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117 error ("%s: unrecognized format character: `%s'", caller, topt); |
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118 else |
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119 valid = false; |
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120 options = __default_plot_options__ (); |
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121 return; |
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122 endif |
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123 endif |
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124 endif |
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125 opt(1:n) = []; |
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126 endwhile |
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127 |
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128 if (have_marker && ! have_linestyle) |
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129 options.linestyle = "none"; |
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130 endif |
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131 |
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132 endfunction |
