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1 ## Copyright (C) 2001 Laurent Mazet |
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2 ## Copyright (C) 2006 John W. Eaton |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 2, or (at your option) |
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9 ## any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, write to the Free |
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18 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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19 ## 02110-1301, USA. |
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20 |
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21 ## -*- texinfo -*- |
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22 ## @deftypefn {Function File} {} legend (@var{st1}, @var{st2}, @dots{}) |
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23 ## @deftypefnx {Function File} {} legend (@var{st1}, @var{st2}, @dots{}, @var{pos}) |
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24 ## @deftypefnx {Function File} {} legend (@var{matstr}) |
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25 ## @deftypefnx {Function File} {} legend (@var{matstr}, @var{pos}) |
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26 ## @deftypefnx {Function File} {} legend (@var{cell}) |
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27 ## @deftypefnx {Function File} {} legend (@var{cell}, @var{pos}) |
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28 ## @deftypefnx {Function File} {} legend ('@var{func}') |
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29 ## |
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30 ## Display a legend for the current axes using the specified strings |
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31 ## as labels. Legend entries may be specified as individual character |
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32 ## string arguments, a character array, or a cell array of character |
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33 ## strings. Legend works on line graphs, bar graphs, etc. A plot must |
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34 ## exist before legend is called. |
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35 ## |
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36 ## The optional parameter @var{pos} specifies the location of the legend |
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37 ## as follows: |
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38 ## |
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39 ## @multitable @columnfractions 0.1 0.1 0.8 |
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40 ## @item @tab -1 @tab |
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41 ## To the top right of the plot |
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42 ## @item @tab 0 @tab |
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43 ## Don't move the legend box (default) |
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44 ## @item @tab 1 @tab |
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45 ## Upper right-hand corner |
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46 ## @item @tab 2 @tab |
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47 ## Upper left-hand corner |
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48 ## @item @tab 3 @tab |
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49 ## Lower left-hand corner |
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50 ## @item @tab 4 @tab |
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51 ## Lower right-hand corner |
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52 ## @end multitable |
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53 ## |
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54 ## Some specific functions are directely avaliable using @var{func}: |
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55 ## |
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56 ## @table @code |
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57 ## @item "show" |
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58 ## Show legends from the plot |
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59 ## @item "hide" |
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60 ## @itemx off |
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61 ## Hide legends from the plot |
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62 ## @item "boxon" |
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63 ## Draw a box around legends |
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64 ## @item "boxoff" |
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65 ## Withdraw the box around legends |
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66 ## @item "left" |
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67 ## Text is to the left of the keys |
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68 ## @item "right" |
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69 ## Text is to the right of the keys |
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70 ## @end table |
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71 ## @end deftypefn |
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72 |
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73 ## PKG_ADD mark_as_command legend |
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74 |
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75 function legend (varargin) |
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76 |
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77 nargs = nargin; |
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78 |
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79 ca = gca (); |
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80 |
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81 if (nargs > 0) |
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82 pos = varargin{nargs}; |
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83 if (isnumeric (pos) && isscalar (pos) && round (pos) == pos) |
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84 if (pos >= -1 && pos <= 4) |
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85 set (ca, "keypos", pos); |
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86 nargs--; |
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87 else |
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88 error ("legend: invalid position specified"); |
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89 endif |
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90 endif |
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91 endif |
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92 |
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93 kids = get (ca, "children"); |
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94 nkids = numel (kids); |
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95 k = 1; |
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96 turn_on_legend = false; |
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97 |
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98 if (nargs == 1) |
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99 arg = varargin{1}; |
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100 if (ischar (arg)) |
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101 if (rows (arg) == 1) |
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102 str = tolower (deblank (arg)); |
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103 switch (str) |
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104 case {"off", "hide"} |
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105 set (ca, "key", "off"); |
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106 case "show" |
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107 set (ca, "key", "on"); |
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108 case "toggle" |
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109 val = get (ca, "key"); |
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110 if (strcmp (val, "on")) |
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111 set (ca, "key", "off"); |
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112 else |
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113 set (ca, "key", "on"); |
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114 endif |
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115 case "boxon" |
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116 set (ca, "key", "on", "keybox", "on"); |
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117 case "boxoff" |
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118 set (ca, "keybox", "off"); |
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119 otherwise |
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120 while (k <= nkids && ! strcmp (get (kids(k), "type"), "line")) |
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121 k++; |
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122 endwhile |
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123 if (k <= nkids) |
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124 turn_on_legend = true; |
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125 set (kids(k), "keylabel", arg); |
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126 else |
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127 warning ("legend: ignoring extra labels"); |
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128 endif |
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129 endswitch |
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130 nargs--; |
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131 else |
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132 varargin = cellstr (arg); |
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133 nargs = numel (varargin); |
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134 endif |
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135 elseif (iscellstr (arg)) |
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136 varargin = arg; |
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137 nargs = numel (varargin); |
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138 else |
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139 error ("legend: expecting argument to be a character string"); |
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140 endif |
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141 endif |
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142 |
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143 if (nargs > 0) |
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144 have_data = false; |
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145 for i = 1:nkids |
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146 if (strcmp (get (kids(k), "type"), "line")) |
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147 have_data = true; |
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148 break; |
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149 endif |
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150 endfor |
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151 if (! have_data) |
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152 warning ("legend: plot data is empty; setting key labels has no effect"); |
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153 endif |
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154 endif |
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155 |
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156 warned = false; |
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157 for i = 1:nargs |
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158 arg = varargin{i}; |
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159 if (ischar (arg)) |
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160 while (k <= nkids && ! strcmp (get (kids(k), "type"), "line")) |
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161 k++; |
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162 endwhile |
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163 if (k <= nkids) |
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164 set (kids(k), "keylabel", arg); |
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165 turn_on_legend = true; |
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166 k++; |
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167 elseif (! warned) |
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168 warned = true; |
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169 warning ("legend: ignoring extra labels"); |
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170 endif |
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171 else |
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172 error ("legend: expecting argument to be a character string"); |
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173 endif |
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174 endfor |
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175 |
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176 if (turn_on_legend) |
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177 set (ca, "key", "on"); |
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178 endif |
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179 |
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180 endfunction |
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181 |
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182 %!demo |
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183 %! close all; |
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184 %! plot(1:10, 1:10); |
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185 %! title("a very long label can sometimes cause problems"); |
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186 %! legend({"hello world"}, -1) |
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187 |
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188 %!demo |
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189 %! close all; |
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190 %! labels = {}; |
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191 %! for i = 1:5 |
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192 %! plot(1:100, i + rand(100,1)); hold on; |
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193 %! labels = {labels{:}, strcat("Signal ", num2str(i))}; |
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194 %! endfor; hold off; |
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195 %! title("Signals with random offset and uniform noise") |
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196 %! xlabel("Sample Nr [k]"); ylabel("Amplitude [V]"); |
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197 %! legend(labels, -1) |
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198 %! legend("boxon") |
