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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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## Undocumented internal function. |
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21 |
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22 ## Really decode plot option strings. |
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23 |
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24 ## Author: Rick Niles <niles@axp745.gsfc.nasa.gov> |
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25 ## Adapted-By: jwe |
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26 ## Maintainer: jwe |
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27 |
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28 function [options, valid] = __pltopt1__ (caller, opt, err_on_invalid) |
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29 |
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30 options = __default_plot_options__ (); |
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31 valid = true; |
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32 |
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33 more_opts = 1; |
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34 |
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35 if (nargin != 2 && nargin != 3) |
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36 print_usage (); |
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37 endif |
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38 |
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39 if (! ischar (opt)) |
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40 return; |
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41 endif |
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42 |
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43 have_linestyle = false; |
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44 have_marker = false; |
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45 |
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46 ## If called by __errplot__, extract the linestyle before proceeding. |
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47 if (strcmp (caller,"__errplot__")) |
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48 if (strncmp (opt, "#~>", 3)) |
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49 n = 3; |
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50 elseif (strncmp (opt, "#~", 2) || strncmp (opt, "~>", 2)) |
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51 n = 2; |
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52 elseif (strncmp (opt, "~", 1) || strncmp (opt, ">", 1) |
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53 || strncmp (opt, "#", 1)) |
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54 n = 1; |
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55 endif |
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56 options.linestyle = opt(1:n); |
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57 opt(1:n) = []; |
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58 have_linestyle = true; |
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59 endif |
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60 |
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61 while (! isempty (opt)) |
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62 if (strncmp (opt, "--", 2) || strncmp (opt, "-.", 2)) |
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63 options.linestyle = opt(1:2); |
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64 have_linestyle = true; |
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65 n = 2; |
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66 else |
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67 topt = opt(1); |
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68 n = 1; |
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69 if (topt == "-" || topt == ":") |
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70 have_linestyle = true; |
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71 options.linestyle = topt; |
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72 elseif (topt == "+" || topt == "o" || topt == "*" |
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73 || topt == "." || topt == "x" || topt == "s" |
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74 || topt == "d" || topt == "^" || topt == "v" |
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75 || topt == ">" || topt == "<" || topt == "p" |
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76 || topt == "h" || topt == "@") |
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77 have_marker = true; |
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78 ## Backward compatibility. Leave undocumented. |
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79 if (topt == "@") |
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80 topt = "+"; |
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81 endif |
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82 options.marker = topt; |
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83 ### Numeric color specs for backward compatibility. Leave undocumented. |
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84 elseif (topt == "k" || topt == "0") |
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85 options.color = [0, 0, 0]; |
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86 elseif (topt == "r" || topt == "1") |
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87 options.color = [1, 0, 0]; |
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88 elseif (topt == "g" || topt == "2") |
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89 options.color = [0, 1, 0]; |
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90 elseif (topt == "b" || topt == "3") |
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91 options.color = [0, 0, 1]; |
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92 elseif (topt == "y") |
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93 options.color = [1, 1, 0]; |
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94 elseif (topt == "m" || topt == "4") |
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95 options.color = [1, 0, 1]; |
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96 elseif (topt == "c" || topt == "5") |
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97 options.color = [0, 1, 1]; |
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98 elseif (topt == "w" || topt == "6") |
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99 options.color = [1, 1, 1]; |
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100 elseif (isspace (topt)) |
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101 ## Do nothing. |
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102 elseif (topt == ";") |
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103 t = index (opt(2:end), ";"); |
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104 if (t) |
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105 options.key = undo_string_escapes (opt(2:t)); |
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106 n = t+1; |
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107 else |
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108 if (err_on_invalid) |
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109 error ("%s: unfinished key label", caller); |
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110 else |
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111 valid = false; |
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112 options = __default_plot_options__ (); |
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113 return; |
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114 endif |
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115 endif |
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116 else |
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117 if (err_on_invalid) |
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118 error ("%s: unrecognized format character: `%s'", caller, topt); |
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119 else |
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120 valid = false; |
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121 options = __default_plot_options__ (); |
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122 return; |
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123 endif |
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124 endif |
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125 endif |
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126 opt(1:n) = []; |
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127 endwhile |
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128 |
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129 if (have_marker && ! have_linestyle) |
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130 options.linestyle = "none"; |
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131 endif |
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132 |
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133 endfunction |
