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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, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} axis (@var{limits}) |
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22 ## Set axis limits for plots. |
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23 ## |
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24 ## The argument @var{limits} should be a 2, 4, or 6 element vector. The |
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25 ## first and second elements specify the lower and upper limits for the x |
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26 ## axis. The third and fourth specify the limits for the y axis, and the |
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27 ## fifth and sixth specify the limits for the z axis. |
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28 ## |
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29 ## If your plot is already drawn, then you need to use @code{replot} before |
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30 ## the new axis limits will take effect. You can get this to happen |
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31 ## automatically by setting the built-in variable @code{automatic_replot} |
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32 ## to a nonzero value. |
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33 ## |
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34 ## Without any arguments, @code{axis} turns autoscaling on. |
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35 ## |
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36 ## With one output argument, @code{x=axis} returns the current axes |
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37 ## (this is not yet implemented for automatic axes). |
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38 ## |
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39 ## The vector argument specifying limits is optional, and additional |
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40 ## string arguments may be used to specify various axis properties. For |
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41 ## example, |
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42 ## |
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43 ## @example |
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44 ## axis ([1, 2, 3, 4], "square"); |
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45 ## @end example |
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46 ## |
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47 ## @noindent |
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48 ## forces a square aspect ratio, and |
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49 ## |
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50 ## @example |
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51 ## axis ("labely", "tic"); |
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52 ## @end example |
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53 ## |
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54 ## @noindent |
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55 ## turns tic marks on for all axes and tic mark labels on for the y-axis |
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56 ## only. |
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57 ## |
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58 ## @noindent |
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59 ## The following options control the aspect ratio of the axes. |
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60 ## |
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61 ## @table @code |
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62 ## @item "square" |
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63 ## Force a square aspect ratio. |
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64 ## @item "equal" |
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65 ## Force x distance to equal y-distance. |
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66 ## @item "normal" |
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67 ## Restore the balance. |
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68 ## @end table |
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69 ## |
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70 ## @noindent |
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71 ## The following options control the way axis limits are interpreted. |
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72 ## |
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73 ## @table @code |
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74 ## @item "auto" |
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75 ## Set the specified axes to have nice limits around the data |
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76 ## or all if no axes are specified. |
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77 ## @item "manual" |
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78 ## Fix the current axes limits. |
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79 ## @item "tight" |
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80 ## Fix axes to the limits of the data (not implemented). |
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81 ## @end table |
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82 ## |
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83 ## @noindent |
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84 ## The option @code{"image"} is equivalent to @code{"tight"} and |
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85 ## @code{"equal"}. |
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86 ## |
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87 ## @noindent |
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88 ## The following options affect the appearance of tic marks. |
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89 ## |
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90 ## @table @code |
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91 ## @item "on" |
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92 ## Turn tic marks and labels on for all axes. |
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93 ## @item "off" |
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94 ## Turn tic marks off for all axes. |
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95 ## @item "tic[xyz]" |
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96 ## Turn tic marks on for all axes, or turn them on for the |
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97 ## specified axes and off for the remainder. |
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98 ## @item "label[xyz]" |
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99 ## Turn tic labels on for all axes, or turn them on for the |
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100 ## specified axes and off for the remainder. |
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101 ## @item "nolabel" |
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102 ## Turn tic labels off for all axes. |
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103 ## @end table |
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104 ## Note, if there are no tic marks for an axis, there can be no labels. |
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105 ## |
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106 ## @noindent |
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107 ## The following options affect the direction of increasing values on |
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108 ## the axes. |
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109 ## |
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110 ## @table @code |
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111 ## @item "ij" |
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112 ## Reverse y-axis, so lower values are nearer the top. |
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113 ## @item "xy" |
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114 ## Restore y-axis, so higher values are nearer the top. |
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115 ## @end table |
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116 ## |
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117 ## @end deftypefn |
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118 |
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119 ## Author: jwe |
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120 |
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121 function curr_axis = axis (ax, varargin) |
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122 |
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123 ## This may not be correct if someone has used the gnuplot interface |
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124 ## directly... |
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125 |
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126 global __current_axis__ = [-10, 10, -10, 10]; |
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127 |
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128 ## To return curr_axis properly, octave needs to take control of scaling. |
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129 ## It isn't hard to compute good axis limits: |
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130 ## scale = 10 ^ floor (log10 (max - min) - 1); |
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131 ## r = scale * [floor (min / scale), ceil (max / scale)]; |
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132 ## However, with axis("manual") there is little need to know the current |
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133 ## limits. |
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134 |
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135 if (nargin == 0) |
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136 if (nargout == 0) |
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137 gset autoscale; |
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138 else |
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139 curr_axis = __current_axis__; |
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140 endif |
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141 |
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142 elseif (isstr (ax)) |
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143 ax = tolower (ax); |
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144 len = length (ax); |
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145 |
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146 ## 'matrix mode' to reverse the y-axis |
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147 if (strcmp (ax, "ij")) |
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148 gset yrange [] reverse; |
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149 elseif (strcmp (ax, "xy")) |
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150 gset yrange [] noreverse; |
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151 |
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152 ## aspect ratio |
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153 elseif (strcmp (ax, "image")) |
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154 gset size ratio -1; |
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155 gset autoscale; ## XXX FIXME XXX should be the same as "tight" |
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156 elseif (strcmp (ax, "equal")) |
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157 gset size ratio -1; |
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158 elseif (strcmp (ax, "square")) |
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159 gset size ratio 1; |
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160 elseif (strcmp (ax, "normal")) |
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161 gset size noratio; |
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162 |
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163 |
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164 ## axis limits |
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165 elseif (len >= 4 && strcmp (ax(1:4), "auto")) |
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166 if (len > 4) |
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167 eval (sprintf ("gset autoscale %s;", ax(5:len))); |
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168 else |
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169 gset autoscale; |
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170 endif |
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171 elseif (strcmp (ax, "manual")) |
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172 ## fixes the axis limits, like axis(axis) should; |
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173 gset xrange [] writeback; |
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174 gset yrange [] writeback; |
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175 gset zrange [] writeback; |
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176 ## XXX FIXME XXX if writeback were set in plot, no need to replot here. |
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177 replot; |
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178 gset noautoscale x; |
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179 gset noautoscale y; |
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180 gset noautoscale z; |
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181 elseif (strcmp (ax, "tight")) |
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182 ## XXX FIXME XXX if tight, plot must set ranges to limits of the |
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183 ## all the data on the current plot, even if from a previous call. |
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184 ## Instead, just let gnuplot do as it likes. |
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185 gset autoscale; |
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186 |
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187 |
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188 ## tic marks |
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189 elseif (strcmp (ax, "on")) |
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190 gset xtics; |
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191 gset ytics; |
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192 gset ztics; |
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193 gset format; |
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194 elseif (strcmp (ax, "off")) |
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195 gset noxtics; |
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196 gset noytics; |
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197 gset noztics; |
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198 elseif (strcmp (ax, "tic")) |
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199 gset xtics; |
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200 gset ytics; |
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201 gset ztics; |
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202 elseif (len > 3 && strcmp (ax(1:3), "tic")) |
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203 if (any (ax == "x")) |
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204 gset xtics; |
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205 else |
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206 gset noxtics; |
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207 endif |
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208 if (any (ax == "y")) |
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209 gset ytics; |
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210 else |
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211 gset noytics; |
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212 endif |
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213 if (any (ax == "z")) |
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214 gset ztics; |
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215 else |
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216 gset noztics; |
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217 endif |
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218 elseif (strcmp (ax, "label")) |
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219 gset format; |
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220 elseif (strcmp (ax, "nolabel")) |
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221 gset format "\\0"; |
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222 elseif (len > 5 && strcmp (ax(1:5), "label")) |
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223 if (any (ax == "x")) |
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224 gset format x; |
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225 else |
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226 gset format x "\\0"; |
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227 endif |
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228 if (any (ax == "y")) |
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229 gset format y; |
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230 else |
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231 gset format y "\\0"; |
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232 endif |
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233 if (any (ax == "z")) |
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234 gset format z; |
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235 else |
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236 gset format z "\\0"; |
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237 endif |
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238 |
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239 else |
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240 warning ("unknown axis option '%s'", ax); |
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241 endif |
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242 |
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243 elseif (isvector (ax)) |
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244 |
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245 len = length (ax); |
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246 |
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247 if (len != 2 && len != 4 && len != 6) |
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248 error ("axis: expecting vector with 2, 4, or 6 elements"); |
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249 endif |
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250 |
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251 __current_axis__ = reshape (ax, 1, len); |
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252 |
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253 if (len > 1) |
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254 eval (sprintf ("gset xrange [%g:%g];", ax(1), ax(2))); |
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255 endif |
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256 |
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257 if (len > 3) |
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258 eval (sprintf ("gset yrange [%g:%g];", ax(3), ax(4))); |
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259 endif |
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260 |
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261 if (len > 5) |
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262 eval (sprintf ("gset zrange [%g:%g];", ax(5), ax(6))); |
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263 endif |
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264 |
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265 else |
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266 error ("axis: expecting no args, or a vector with 2, 4, or 6 elements"); |
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267 endif |
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268 |
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269 if (nargin > 1) |
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270 axis (varargin{:}); |
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271 endif |
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272 endfunction |
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273 |
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274 %!demo |
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275 %! t=0:0.01:2*pi; x=sin(t); |
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276 %! |
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277 %! subplot(221); title("normal plot"); |
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278 %! plot(t, x, ";;"); |
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279 %! |
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280 %! subplot(222); title("square plot"); |
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281 %! axis("square"); plot(t, x, ";;"); |
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282 %! |
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283 %! subplot(223); title("equal plot"); |
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284 %! axis("equal"); plot(t, x, ";;"); |
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285 %! |
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286 %! subplot(224); title("normal plot again"); |
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287 %! axis("normal"); plot(t, x, ";;"); |
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288 |
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289 %!demo |
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290 %! t=0:0.01:2*pi; x=sin(t); |
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291 %! |
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292 %! subplot(121); title("ij plot"); |
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293 %! axis("ij"); plot(t, x, ";;"); |
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294 %! |
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295 %! subplot(122); title("xy plot"); |
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296 %! axis("xy"); plot(t, x, ";;"); |
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297 |
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298 %!demo |
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299 %! t=0:0.01:2*pi; x=sin(t); |
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300 %! |
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301 %! subplot(331); title("x tics & labels"); |
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302 %! axis("ticx"); plot(t, x, ";;"); |
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303 %! |
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304 %! subplot(332); title("y tics & labels"); |
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305 %! axis("ticy"); plot(t, x, ";;"); |
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306 %! |
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307 %! subplot(334); title("x & y tics, x labels"); |
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308 %! axis("labelx","tic"); plot(t, x, ";;"); |
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309 %! |
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310 %! subplot(335); title("x & y tics, y labels"); |
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311 %! axis("labely","tic"); plot(t, x, ";;"); |
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312 %! |
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313 %! subplot(337); title("x tics, no labels"); |
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314 %! axis("nolabel","ticx"); plot(t, x, ";;"); |
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315 %! |
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316 %! subplot(338); title("y tics, no labels"); |
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317 %! axis("nolabel","ticy"); plot(t, x, ";;"); |
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318 %! |
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319 %! subplot(333); title("no tics or labels"); |
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320 %! axis("off"); plot(t, x, ";;"); |
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321 %! |
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322 %! subplot(336); title("all tics but no labels"); |
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323 %! axis("nolabel","tic"); plot(t, x, ";;"); |
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324 %! |
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325 %! subplot(339); title("all tics & labels"); |
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326 %! axis("on"); plot(t, x, ";;"); |
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327 |
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328 %!demo |
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329 %! t=0:0.01:2*pi; x=sin(t); |
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330 %! |
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331 %! subplot(321); title("axes at [0 3 0 1]") |
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332 %! axis([0,3,0,1]); plot(t, x, ";;"); |
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333 %! |
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334 %! subplot(322); title("auto"); |
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335 %! axis("auto"); plot(t, x, ";;"); |
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336 %! |
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337 %! subplot(323); title("manual"); |
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338 %! plot(t, x, ";sine [0:2pi];"); hold on; |
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339 %! axis("manual"); |
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340 %! plot(-3:3,-3:3, ";line (-3,-3)->(3,3);"); hold off; |
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341 %! |
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342 %! subplot(324); title("axes at [0 3 0 1], then autox"); |
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343 %! axis([0,3,0,1]); axis("autox"); |
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344 %! plot(t, x, ";sine [0:2pi];"); |
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345 %! |
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346 %! subplot(325); title("axes at [3 6 0 1], then autoy"); |
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347 %! axis([3,6,0,1]); axis("autoy"); |
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348 %! plot(t, x, ";sine [0:2p];"); |
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349 %! |
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350 %! subplot(326); title("tight"); |
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351 %! axis("tight"); plot(t, x, ";;"); |
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352 %! % The last plot should not have any whitespace outside the data |
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353 %! % limits, but "tight" isn't implemented yet. |
