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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 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} grid (@var{arg}) |
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22 ## @deftypefnx {Function File} {} grid ("minor", @var{arg2}) |
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23 ## For two-dimensional plotting, force the display of a grid on the plot. |
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24 ## The argument may be either @code{"on"} or @code{"off"}. If it is |
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25 ## omitted, the the current grid state is toggled. |
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26 ## |
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27 ## If @var{arg} is @code{"minor"} then the minor grid is toggled. When |
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28 ## using a minor grid a second argument @var{arg2} is allowed, which can |
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29 ## be either @code{"on"} or @code{"off"} to explicitly set the state of |
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30 ## the minor grid, or alternatively a positive integer specifying the |
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31 ## number of minor grid lines. |
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32 ## @seealso{plot, semilogx, semilogy, loglog, polar, mesh, contour, |
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33 ## bar, stairs, replot, xlabel, ylabel, title} |
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34 ## @end deftypefn |
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35 |
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36 ## Author: jwe |
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37 |
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38 ## PKG_ADD: mark_as_command grid |
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39 |
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40 function grid (x, y) |
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41 |
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42 persistent grid_on = false; |
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43 persistent minor_on = false; |
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44 persistent minor_tics = 5; |
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45 |
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46 usage_msg = "grid (\"on\" | \"off\")"; |
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47 |
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48 do_replot = false; |
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49 |
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50 if (nargin == 0) |
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51 grid_on = ! grid_on; |
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52 if (grid_on) |
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53 __gnuplot_raw__ ("set grid;\n"); |
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54 else |
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55 __gnuplot_raw__ ("set nogrid;\n"); |
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56 endif |
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57 do_replot = true; |
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58 elseif (nargin == 1) |
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59 if (ischar (x)) |
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60 if (strcmp ("off", x)) |
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61 __gnuplot_raw__ ("set nogrid;\n"); |
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62 grid_on = false; |
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63 do_replot = true; |
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64 elseif (strcmp ("on", x)) |
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65 __gnuplot_raw__ ("set grid;\n"); |
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66 grid_on = true; |
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67 do_replot = true; |
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68 elseif (strcmp ("minor", x)) |
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69 minor_on = ! minor_on; |
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70 if (minor_on) |
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71 cmd = sprintf ("set mxtics %d;\n", minor_tics); |
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72 __gnuplot_raw__ (cmd); |
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73 cmd = sprintf ("set mytics %d;\n", minor_tics); |
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74 __gnuplot_raw__ (cmd); |
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75 __gnuplot_raw__ ("set grid xtics mxtics ytics mxtics;\n"); |
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76 minor_on = true; |
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77 else |
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78 if (grid_on) |
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79 __gnuplot_raw__ ("set grid xtics nomxtics ytics nomxtics;\n"); |
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80 else |
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81 __gnuplot_raw__ ("set grid noxtics nomxtics noytics nomxtics;\n"); |
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82 endif |
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83 minor_on = false; |
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84 endif |
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85 do_replot = true; |
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86 else |
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87 usage (usage_msg); |
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88 endif |
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89 else |
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90 error ("grid: argument must be a string"); |
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91 endif |
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92 elseif (nargin == 2) |
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93 if (ischar (x)) |
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94 if (strcmp ("minor", x)) |
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95 d = str2num (y); |
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96 if (isempty (d)) |
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97 if (strcmp ("off", y)) |
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98 if (grid_on) |
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99 __gnuplot_raw__ ("set grid xtics nomxtics ytics nomxtics;\n"); |
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100 else |
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101 __gnuplot_raw__ ("set grid noxtics nomxtics noytics nomxtics;\n"); |
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102 endif |
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103 minor_on = false; |
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104 elseif (strcmp ("on", y)) |
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105 cmd = sprintf ("set mxtics %d;\n", minor_tics); |
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106 __gnuplot_raw__ (cmd); |
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107 cmd = sprintf ("set mytics %d;\n", minor_tics); |
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108 __gnuplot_raw__ (cmd); |
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109 __gnuplot_raw__ ("set grid xtics mxtics ytics mxtics;\n"); |
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110 minor_on = true; |
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111 else |
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112 usage (usage_msg); |
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113 endif |
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114 do_replot = true; |
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115 else |
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116 if (isscalar(d) && ! isnan (d) && ! isinf (d)) |
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117 minor_tics = max (floor (d), 0); |
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118 cmd = sprintf ("set mxtics %d;\n", minor_tics); |
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119 __gnuplot_raw__ (cmd); |
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120 cmd = sprintf("set mytics %d;\n", minor_tics); |
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121 __gnuplot_raw__ (cmd); |
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122 __gnuplot_raw__ ("set grid xtics mxtics ytics mxtics;\n"); |
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123 minor_on = true; |
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124 do_replot = true; |
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125 else |
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126 usage (usage_msg); |
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127 endif |
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128 endif |
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129 else |
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130 usage (usage_msg); |
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131 endif |
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132 else |
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133 usage (usage_msg); |
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134 endif |
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135 else |
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136 usage (usage_msg); |
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137 endif |
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138 |
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139 if (do_replot && automatic_replot) |
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140 replot (); |
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141 endif |
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142 |
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143 endfunction |
