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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 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} axis (@var{limits}) |
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21 ## Set axis limits for plots. |
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22 ## |
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23 ## The argument @var{limits} should be a 2, 4, or 6 element vector. The |
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24 ## first and second elements specify the lower and upper limits for the x |
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25 ## axis. The third and fourth specify the limits for the y axis, and the |
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26 ## fifth and sixth specify the limits for the z axis. |
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27 ## |
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28 ## Without any arguments, @code{axis} turns autoscaling on. |
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29 ## |
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30 ## With one output argument, @code{x=axis} returns the current axes |
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31 ## (this is not yet implemented for automatic axes). |
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32 ## |
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33 ## The vector argument specifying limits is optional, and additional |
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34 ## string arguments may be used to specify various axis properties. For |
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35 ## example, |
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36 ## |
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37 ## @example |
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38 ## axis ([1, 2, 3, 4], "square"); |
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39 ## @end example |
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40 ## |
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41 ## @noindent |
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42 ## forces a square aspect ratio, and |
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43 ## |
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44 ## @example |
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45 ## axis ("labely", "tic"); |
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46 ## @end example |
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47 ## |
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48 ## @noindent |
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49 ## turns tic marks on for all axes and tic mark labels on for the y-axis |
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50 ## only. |
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51 ## |
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52 ## @noindent |
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53 ## The following options control the aspect ratio of the axes. |
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54 ## |
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55 ## @table @code |
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56 ## @item "square" |
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57 ## Force a square aspect ratio. |
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58 ## @item "equal" |
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59 ## Force x distance to equal y-distance. |
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60 ## @item "normal" |
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61 ## Restore the balance. |
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62 ## @end table |
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63 ## |
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64 ## @noindent |
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65 ## The following options control the way axis limits are interpreted. |
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66 ## |
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67 ## @table @code |
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68 ## @item "auto" |
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69 ## Set the specified axes to have nice limits around the data |
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70 ## or all if no axes are specified. |
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71 ## @item "manual" |
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72 ## Fix the current axes limits. |
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73 ## @item "tight" |
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74 ## Fix axes to the limits of the data (not implemented). |
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75 ## @end table |
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76 ## |
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77 ## @noindent |
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78 ## The option @code{"image"} is equivalent to @code{"tight"} and |
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79 ## @code{"equal"}. |
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80 ## |
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81 ## @noindent |
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82 ## The following options affect the appearance of tic marks. |
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83 ## |
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84 ## @table @code |
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85 ## @item "on" |
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86 ## Turn tic marks and labels on for all axes. |
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87 ## @item "off" |
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88 ## Turn tic marks off for all axes. |
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89 ## @item "tic[xyz]" |
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90 ## Turn tic marks on for all axes, or turn them on for the |
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91 ## specified axes and off for the remainder. |
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92 ## @item "label[xyz]" |
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93 ## Turn tic labels on for all axes, or turn them on for the |
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94 ## specified axes and off for the remainder. |
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95 ## @item "nolabel" |
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96 ## Turn tic labels off for all axes. |
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97 ## @end table |
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98 ## Note, if there are no tic marks for an axis, there can be no labels. |
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99 ## |
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100 ## @noindent |
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101 ## The following options affect the direction of increasing values on |
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102 ## the axes. |
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103 ## |
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104 ## @table @code |
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105 ## @item "ij" |
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106 ## Reverse y-axis, so lower values are nearer the top. |
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107 ## @item "xy" |
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108 ## Restore y-axis, so higher values are nearer the top. |
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109 ## @end table |
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110 ## |
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111 ## @end deftypefn |
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112 |
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113 ## Author: jwe |
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114 |
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115 ## PKG_ADD: mark_as_command axis |
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116 |
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117 function curr_axis = axis (ax, varargin) |
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118 |
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119 ca = gca (); |
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120 |
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121 if (nargin == 0) |
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122 if (nargout == 0) |
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123 set (ca, "xlimmode", "auto", "ylimmode", "auto", "zlimmode", "auto"); |
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124 else |
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125 xlim = get (ca, "xlim"); |
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126 ylim = get (ca, "ylim"); |
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127 zlim = get (ca, "zlim"); |
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128 curr_axis = [xlim, ylim, zlim]; |
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129 endif |
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130 |
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131 elseif (ischar (ax)) |
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132 ax = tolower (ax); |
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133 len = length (ax); |
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134 |
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135 ## 'matrix mode' to reverse the y-axis |
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136 if (strcmp (ax, "ij")) |
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137 set (ca, "ydir", "reverse"); |
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138 elseif (strcmp (ax, "xy")) |
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139 set (ca, "ydir", "normal"); |
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140 |
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141 ## aspect ratio |
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142 elseif (strcmp (ax, "image")) |
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143 set (ca, "dataaspectratio", [1, 1, 1]); |
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144 ## FIXME should be the same as "tight" |
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145 set (ca, "xlimmode", "auto", "ylimmode", "auto", "zlimmode", "auto"); |
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146 elseif (strcmp (ax, "equal") || strcmp (ax, "square")) |
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147 set (ca, "dataaspectratio", [1, 1, 1]); |
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148 elseif (strcmp (ax, "normal")) |
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149 set (ca, "dataaspectratiomode", "auto"); |
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150 |
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151 ## axis limits |
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152 elseif (len >= 4 && strcmp (ax(1:4), "auto")) |
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153 if (len > 4) |
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154 if (any (ax == "x")) |
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155 set (ca, "xlimmode", "auto"); |
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156 endif |
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157 if (any (ax == "y")) |
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158 set (ca, "ylimmode", "auto"); |
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159 endif |
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160 if (any (ax == "z")) |
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161 set (ca, "zlimmode", "auto"); |
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162 endif |
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163 else |
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164 set (ca, "xlimmode", "auto", "ylimmode", "auto", "zlimmode", "auto"); |
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165 endif |
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166 elseif (strcmp (ax, "manual")) |
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167 ## fixes the axis limits, like axis(axis) should; |
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168 set (ca, "xlimmode", "manual", "ylimmode", "manual", "zlimmode", "manual"); |
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169 elseif (strcmp (ax, "tight")) |
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170 ## FIXME if tight, plot must set ranges to limits of the |
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171 ## all the data on the current plot, even if from a previous call. |
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172 ## Instead, just let gnuplot do as it likes. |
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173 set (ca, "xlimmode", "auto", "ylimmode", "auto", "zlimmode", "auto"); |
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174 |
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175 ## tic marks |
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176 elseif (strcmp (ax, "on") || strcmp (ax, "tic")) |
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177 set (ca, "xtickmode", "auto", "ytickmode", "auto", "ztickmode", "auto"); |
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178 set (ca, "xticklabelmode", "auto", "yticklabelmode", "auto", |
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179 "zticklabelmode", "auto"); |
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180 set (ca, "visible", "on"); |
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181 elseif (strcmp (ax, "off")) |
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182 set (ca, "xtick", [], "ytick", [], "ztick", []); |
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183 set (ca, "visible", "off"); |
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184 elseif (len > 3 && strcmp (ax(1:3), "tic")) |
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185 if (any (ax == "x")) |
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186 set (ca, "xtickmode", "auto"); |
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187 else |
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188 set (ca, "xtick", []); |
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189 endif |
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190 if (any (ax == "y")) |
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191 set (ca, "ytickmode", "auto"); |
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192 else |
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193 set (ca, "ytick", []); |
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194 endif |
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195 if (any (ax == "z")) |
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196 set (ca, "ztickmode", "auto"); |
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197 else |
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198 set (ca, "ztick", []); |
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199 endif |
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200 elseif (strcmp (ax, "label")) |
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201 set (ca, "xticklabelmode", "auto", "yticklabelmode", "auto", |
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202 "zticklabelmode", "auto"); |
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203 elseif (strcmp (ax, "nolabel")) |
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204 set (ca, "xticklabel", "", "yticklabel", "", "zticklabel", ""); |
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205 elseif (len > 5 && strcmp (ax(1:5), "label")) |
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206 if (any (ax == "x")) |
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207 set (ca, "xticklabelmode", "auto"); |
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208 else |
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209 set (ca, "xticklabel", ""); |
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210 endif |
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211 if (any (ax == "y")) |
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212 set (ca, "yticklabelmode", "auto"); |
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213 else |
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214 set (ca, "yticklabel", ""); |
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215 endif |
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216 if (any (ax == "z")) |
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217 set (ca, "zticklabelmode", "auto"); |
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218 else |
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219 set (ca, "zticklabel", ""); |
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220 endif |
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221 |
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222 else |
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223 warning ("unknown axis option '%s'", ax); |
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224 endif |
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225 |
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226 elseif (isvector (ax)) |
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227 |
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228 len = length (ax); |
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229 |
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230 if (len != 2 && len != 4 && len != 6) |
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231 error ("axis: expecting vector with 2, 4, or 6 elements"); |
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232 endif |
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233 |
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234 for i = 1:2:len |
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235 if (ax(i) == ax(i+1)) |
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236 error ("axis: limits(%d) cannot equal limits(%d)", i, i+1); |
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237 endif |
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238 endfor |
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239 |
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240 if (len > 1) |
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241 set (ca, "xlim", [ax(1), ax(2)]); |
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242 endif |
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243 |
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244 if (len > 3) |
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245 set (ca, "ylim", [ax(3), ax(4)]); |
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246 endif |
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247 |
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248 if (len > 5) |
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249 set (ca, "zlim", [ax(5), ax(6)]); |
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250 endif |
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251 |
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252 else |
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253 error ("axis: expecting no args, or a vector with 2, 4, or 6 elements"); |
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254 endif |
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255 |
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256 if (nargin > 1) |
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257 axis (varargin{:}); |
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258 endif |
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259 |
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260 endfunction |
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261 |
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262 %!demo |
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263 %! t=0:0.01:2*pi; x=sin(t); |
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264 %! |
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265 %! subplot(221); title("normal plot"); |
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266 %! plot(t, x); |
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267 %! |
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268 %! subplot(222); title("square plot"); |
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269 %! axis("square"); plot(t, x); |
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270 %! |
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271 %! subplot(223); title("equal plot"); |
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272 %! axis("equal"); plot(t, x); |
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273 %! |
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274 %! subplot(224); title("normal plot again"); |
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275 %! axis("normal"); plot(t, x); |
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276 |
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277 %!demo |
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278 %! t=0:0.01:2*pi; x=sin(t); |
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279 %! |
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280 %! subplot(121); title("ij plot"); |
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281 %! axis("ij"); plot(t, x); |
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282 %! |
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283 %! subplot(122); title("xy plot"); |
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284 %! axis("xy"); plot(t, x); |
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285 |
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286 %!demo |
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287 %! t=0:0.01:2*pi; x=sin(t); |
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288 %! |
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289 %! subplot(331); title("x tics & labels"); |
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290 %! axis("ticx"); plot(t, x); |
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291 %! |
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292 %! subplot(332); title("y tics & labels"); |
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293 %! axis("ticy"); plot(t, x); |
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294 %! |
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295 %! subplot(334); title("x & y tics, x labels"); |
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296 %! axis("labelx","tic"); plot(t, x); |
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297 %! |
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298 %! subplot(335); title("x & y tics, y labels"); |
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299 %! axis("labely","tic"); plot(t, x); |
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300 %! |
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301 %! subplot(337); title("x tics, no labels"); |
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302 %! axis("nolabel","ticx"); plot(t, x); |
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303 %! |
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304 %! subplot(338); title("y tics, no labels"); |
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305 %! axis("nolabel","ticy"); plot(t, x); |
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306 %! |
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307 %! subplot(333); title("no tics or labels"); |
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308 %! axis("off"); plot(t, x); |
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309 %! |
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310 %! subplot(336); title("all tics but no labels"); |
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311 %! axis("nolabel","tic"); plot(t, x); |
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312 %! |
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313 %! subplot(339); title("all tics & labels"); |
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314 %! axis("on"); plot(t, x); |
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315 |
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316 %!demo |
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317 %! t=0:0.01:2*pi; x=sin(t); |
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318 %! |
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319 %! subplot(321); title("axes at [0 3 0 1]") |
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320 %! axis([0,3,0,1]); plot(t, x); |
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321 %! |
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322 %! subplot(322); title("auto"); |
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323 %! axis("auto"); plot(t, x); |
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324 %! |
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325 %! subplot(323); title("manual"); |
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326 %! plot(t, x, ";sine [0:2pi];"); hold on; |
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327 %! axis("manual"); |
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328 %! plot(-3:3,-3:3, ";line (-3,-3)->(3,3);"); hold off; |
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329 %! |
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330 %! subplot(324); title("axes at [0 3 0 1], then autox"); |
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331 %! axis([0,3,0,1]); axis("autox"); |
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332 %! plot(t, x, ";sine [0:2pi];"); |
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333 %! |
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334 %! subplot(325); title("axes at [3 6 0 1], then autoy"); |
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335 %! axis([3,6,0,1]); axis("autoy"); |
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336 %! plot(t, x, ";sine [0:2p];"); |
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337 %! |
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338 %! subplot(326); title("tight"); |
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339 %! axis("tight"); plot(t, x); |
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340 %! % The last plot should not have any whitespace outside the data |
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341 %! % limits, but "tight" isn't implemented yet. |
