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1 ## Copyright (C) 1996 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} {} plot3 (@var{args}) |
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22 ## |
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23 ## This function produces three-dimensional plots. Many different |
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24 ## combinations of arguments are possible. The simplest form is |
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25 ## |
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26 ## @example |
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27 ## plot3 (@var{x}, @var{y}, @var{z}) |
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28 ## @end example |
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29 ## |
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30 ## @noindent |
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31 ## where the arguments are taken to be the vertices of the points to be |
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32 ## plotted in three dimensions. If all arguments are vectors of the same |
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33 ## length, then a single continuous line is drawn. If all arguments are |
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34 ## matrices, then each column of the matrices is treated as a seperate |
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35 ## line. No attempt is made to transpose the arguments to make the |
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36 ## number of rows match. |
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37 ## |
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38 ## Additionally, only two arguments can be given as |
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39 ## |
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40 ## @example |
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41 ## plot3 (@var{x}, @var{c}) |
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42 ## @end example |
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43 ## |
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44 ## where the real and imaginary parts of the second argument are used as |
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45 ## the @var{y} and @var{z} coordinates, respectively. |
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46 ## |
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47 ## If only one argument is given, as |
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48 ## |
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49 ## @example |
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50 ## plot3 (@var{c}) |
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51 ## @end example |
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52 ## |
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53 ## the real and imaginary parts of the argument are used as the @var{y} |
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54 ## and @var{z} values, and they are plotted versus their index. |
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55 ## |
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56 ## To save a plot, in one of several image formats such as PostScript |
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57 ## or PNG, use the @code{print} command. |
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58 ## |
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59 ## An optional format argument can be given as |
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60 ## |
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61 ## @example |
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62 ## plot3 (@var{x}, @var{y}, @var{y}, @var{fmt}) |
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63 ## @end example |
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64 ## |
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65 ## If the @var{fmt} argument is supplied, it is interpreted as |
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66 ## follows. If @var{fmt} is missing, the default gnuplot line style |
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67 ## is assumed. |
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68 ## |
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69 ## @table @samp |
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70 ## @item - |
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71 ## Set lines plot style (default). |
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72 ## |
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73 ## @item . |
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74 ## Set dots plot style. |
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75 ## |
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76 ## @item @@ |
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77 ## Set points plot style. |
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78 ## |
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79 ## @item -@@ |
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80 ## Set linespoints plot style. |
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81 ## |
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82 ## @item ^ |
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83 ## Set impulses plot style. |
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84 ## |
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85 ## @item L |
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86 ## Set steps plot style. |
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87 ## |
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88 ## @item @var{n} |
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89 ## Interpreted as the plot color if @var{n} is an integer in the range 1 to |
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90 ## 6. |
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91 ## |
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92 ## @item @var{nm} |
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93 ## If @var{nm} is a two digit integer and @var{m} is an integer in the |
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94 ## range 1 to 6, @var{m} is interpreted as the point style. This is only |
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95 ## valid in combination with the @code{@@} or @code{-@@} specifiers. |
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96 ## |
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97 ## @item @var{c} |
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98 ## If @var{c} is one of @code{"k"}, @code{"r"}, @code{"g"}, @code{"b"}, |
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99 ## @code{"m"}, @code{"c"}, or @code{"w"}, it is interpreted as the plot |
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100 ## color (black, red, green, blue, magenta, cyan, or white). |
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101 ## |
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102 ## @item ";title;" |
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103 ## Here @code{"title"} is the label for the key. |
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104 ## |
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105 ## @item + |
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106 ## @itemx * |
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107 ## @itemx o |
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108 ## @itemx x |
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109 ## Used in combination with the points or linespoints styles, set the point |
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110 ## style. |
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111 ## @end table |
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112 ## |
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113 ## The color line styles have the following meanings on terminals that |
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114 ## support color. |
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115 ## |
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116 ## @example |
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117 ## Number Gnuplot colors (lines)points style |
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118 ## 1 red * |
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119 ## 2 green + |
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120 ## 3 blue o |
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121 ## 4 magenta x |
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122 ## 5 cyan house |
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123 ## 6 brown there exists |
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124 ## @end example |
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125 ## |
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126 ## The @var{fmt} argument can also be used to assign key titles. |
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127 ## To do so, include the desired title between semi-colons after the |
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128 ## formatting sequence described above, e.g. "+3;Key Title;" |
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129 ## Note that the last semi-colon is required and will generate an error if |
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130 ## it is left out. |
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131 ## |
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132 ## Arguments can also be given in groups of three as |
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133 ## |
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134 ## @example |
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135 ## plot3 (@var{x1}, @var{y1}, @var{y1}, @var{x2}, @var{y2}, @var{y2}, @dots{}) |
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136 ## @end example |
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137 ## |
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138 ## @noindent |
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139 ## where each set of three arguments is treated as a seperate line or |
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140 ## set of lines in three dimensions. |
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141 ## |
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142 ## To plot multiple one- or two-argument groups, separate each group with an |
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143 ## empty format string, as |
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144 ## |
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145 ## @example |
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146 ## plot3 (@var{x1}, @var{c1}, '', @var{c2}, '', @dots{}) |
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147 ## @end example |
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148 ## |
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149 ## An example of the use of plot3 is |
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150 ## |
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151 ## @example |
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152 ## @group |
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153 ## z = [0:0.05:5]; |
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154 ## plot3(cos(2*pi*z), sin(2*pi*z), z, ";helix;"); |
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155 ## plot3(z, exp(2i*pi*z), ";complex sinusoid;"); |
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156 ## @end group |
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157 ## @end example |
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158 ## |
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159 ## @seealso{plot, semilogx, semilogy, loglog, polar, mesh, contour, __pltopt__ |
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160 ## bar, stairs, errorbar, replot, xlabel, ylabel, title, print} |
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161 ## @end deftypefn |
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162 |
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163 ## Author: Paul Kienzle |
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164 ## (modified from __plt__.m) |
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165 |
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166 function plot3 (varargin) |
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167 |
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168 hold_state = ishold (); |
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169 |
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170 unwind_protect |
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171 |
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172 x_set = 0; |
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173 y_set = 0; |
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174 z_set = 0; |
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175 |
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176 ## Gather arguments, decode format, and plot lines. |
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177 for arg = 1:nargin |
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178 new = varargin{arg}; |
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179 |
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180 if (ischar (new)) |
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181 if (! z_set) |
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182 if (! y_set) |
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183 if (! x_set) |
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184 error ("plot3: needs x, [ y, [ z ] ]"); |
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185 else |
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186 z = imag (x); |
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187 y = real (x); |
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188 y_set = 1; |
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189 z_set = 1; |
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190 if (rows(x) > 1) |
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191 x = repmat ((1:rows(x))', 1, columns(x)); |
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192 else |
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193 x = 1:columns(x); |
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194 endif |
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195 endif |
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196 else |
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197 z = imag (y); |
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198 y = real (y); |
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199 z_set = 1; |
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200 endif |
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201 endif |
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202 fmt = __pltopt__ ("plot3", new); |
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203 |
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204 if (isvector (x) && isvector (y)) |
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205 if (isvector (z)) |
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206 x = x(:); |
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207 y = y(:); |
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208 z = z(:); |
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209 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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210 error ("plot3: [length(x), length(y)] must match size(z)"); |
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211 else |
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212 [x, y] = meshgrid (x, y); |
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213 endif |
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214 endif |
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215 |
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216 if (any (size (x) != size (y)) || any (size (x) != size (z))) |
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217 error ("plot3: x, y, and z must have the same shape"); |
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218 endif |
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219 |
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220 unwind_protect |
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221 __gnuplot_raw__ ("set nohidden3d;\n") |
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222 __gnuplot_set__ parametric; |
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223 |
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224 __plt3__ ([([x; NaN*ones(1,size(x,2))])(:), ... |
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225 ([y; NaN*ones(1,size(y,2))])(:), ... |
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226 ([z; NaN*ones(1,size(z,2))])(:)], "", fmt); |
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227 |
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228 unwind_protect_cleanup |
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229 __gnuplot_set__ noparametric; |
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230 end_unwind_protect |
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231 |
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232 hold ("on"); |
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233 x_set = 0; |
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234 y_set = 0; |
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235 z_set = 0; |
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236 elseif (! x_set) |
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237 x = new; |
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238 x_set = 1; |
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239 elseif (! y_set) |
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240 y = new; |
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241 y_set = 1; |
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242 elseif (! z_set) |
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243 z = new; |
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244 z_set = 1; |
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245 else |
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246 if (isvector (x) && isvector (y)) |
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247 if (isvector (z)) |
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248 x = x(:); |
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249 y = y(:); |
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250 z = z(:); |
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251 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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252 error ("plot3: [length(x), length(y)] must match size(z)"); |
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253 else |
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254 [x, y] = meshgrid (x, y); |
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255 endif |
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256 endif |
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257 |
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258 if (any (size (x) != size (y)) || any (size (x) != size (z))) |
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259 error ("plot3: x, y, and z must have the same shape"); |
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260 endif |
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261 |
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262 unwind_protect |
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263 __gnuplot_raw__ ("set nohidden3d;\n") |
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264 __gnuplot_set__ parametric; |
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265 |
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266 __plt3__ ([([x; NaN*ones(1,size(x,2))])(:), ... |
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267 ([y; NaN*ones(1,size(y,2))])(:), ... |
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268 ([z; NaN*ones(1,size(z,2))])(:)]); |
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269 |
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270 unwind_protect_cleanup |
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271 __gnuplot_set__ noparametric; |
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272 end_unwind_protect |
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273 |
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274 hold ("on"); |
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275 x = new; |
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276 y_set = 0; |
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277 z_set = 0; |
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278 endif |
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279 |
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280 endfor |
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281 |
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282 ## Handle last plot. |
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283 |
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284 if (x_set) |
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285 if (y_set) |
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286 if (! z_set) |
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287 z = imag (y); |
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288 y = real (y); |
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289 z_set = 1; |
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290 endif |
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291 else |
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292 z = imag (x); |
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293 y = real (x); |
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294 y_set = 1; |
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295 z_set = 1; |
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296 if (rows (x) > 1) |
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297 x = repmat ((1:rows (x))', 1, columns(x)); |
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298 else |
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299 x = 1:columns(x); |
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300 endif |
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301 endif |
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302 |
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303 if (isvector (x) && isvector (y)) |
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304 if (isvector (z)) |
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305 x = x(:); |
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306 y = y(:); |
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307 z = z(:); |
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308 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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309 error ("plot3: [length(x), length(y)] must match size(z)"); |
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310 else |
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311 [x, y] = meshgrid (x, y); |
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312 endif |
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313 endif |
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314 |
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315 if (any (size (x) != size (y)) || any (size (x) != size (z))) |
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316 error ("plot3: x, y, and z must have the same shape"); |
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317 endif |
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318 |
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319 unwind_protect |
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320 __gnuplot_raw__ ("set nohidden3d;\n") |
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321 __gnuplot_set__ parametric; |
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322 |
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323 __plt3__ ([([x; NaN*ones(1,size(x,2))])(:), ... |
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324 ([y; NaN*ones(1,size(y,2))])(:), ... |
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325 ([z; NaN*ones(1,size(z,2))])(:)]); |
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326 unwind_protect_cleanup |
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327 __gnuplot_set__ noparametric; |
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328 end_unwind_protect |
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329 endif |
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330 |
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331 unwind_protect_cleanup |
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332 |
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333 if (! hold_state) |
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334 hold ("off"); |
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335 endif |
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336 |
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337 end_unwind_protect |
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338 |
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339 endfunction |
