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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 ## See @code{__pltopt__} for a description of the optional format |
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60 ## argument. |
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61 ## |
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62 ## Arguments can also be given in groups of three as |
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63 ## |
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64 ## @example |
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65 ## plot3 (@var{x1}, @var{y1}, @var{z1}, @var{x2}, @var{y2}, @var{z2}, @dots{}) |
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66 ## @end example |
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67 ## |
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68 ## @noindent |
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69 ## where each set of three arguments is treated as a seperate line or |
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70 ## set of lines in three dimensions. |
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71 ## |
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72 ## To plot multiple one- or two-argument groups, separate each group with an |
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73 ## empty format string, as |
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74 ## |
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75 ## @example |
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76 ## plot3 (@var{x1}, @var{c1}, '', @var{c2}, '', @dots{}) |
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77 ## @end example |
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78 ## |
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79 ## An example of the use of plot3 is |
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80 ## |
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81 ## @example |
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82 ## @group |
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83 ## z = [0:0.05:5]; |
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84 ## plot3(cos(2*pi*z), sin(2*pi*z), z, ";helix;"); |
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85 ## plot3(z, exp(2i*pi*z), ";complex sinusoid;"); |
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86 ## @end group |
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87 ## @end example |
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88 ## |
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89 ## @seealso{plot, semilogx, semilogy, loglog, polar, mesh, contour, __pltopt__ |
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90 ## bar, stairs, errorbar, xlabel, ylabel, title, print} |
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91 ## @end deftypefn |
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92 |
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93 ## Author: Paul Kienzle |
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94 ## (modified from __plt__.m) |
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95 |
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96 function retval = plot3 (varargin) |
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97 |
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98 x_set = 0; |
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99 y_set = 0; |
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100 z_set = 0; |
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101 |
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102 idx = 0; |
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103 |
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104 ## Gather arguments, decode format, and plot lines. |
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105 for arg = 1:nargin |
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106 new = varargin{arg}; |
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107 |
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108 if (ischar (new)) |
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109 if (! z_set) |
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110 if (! y_set) |
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111 if (! x_set) |
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112 error ("plot3: needs x, [ y, [ z ] ]"); |
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113 else |
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114 z = imag (x); |
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115 y = real (x); |
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116 y_set = 1; |
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117 z_set = 1; |
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118 if (rows(x) > 1) |
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119 x = repmat ((1:rows(x))', 1, columns(x)); |
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120 else |
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121 x = 1:columns(x); |
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122 endif |
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123 endif |
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124 else |
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125 z = imag (y); |
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126 y = real (y); |
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127 z_set = 1; |
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128 endif |
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129 endif |
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130 options = __pltopt__ ("plot3", new); |
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131 |
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132 if (isvector (x) && isvector (y)) |
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133 if (isvector (z)) |
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134 x = x(:); |
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135 y = y(:); |
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136 z = z(:); |
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137 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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138 error ("plot3: [length(x), length(y)] must match size(z)"); |
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139 else |
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140 [x, y] = meshgrid (x, y); |
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141 endif |
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142 endif |
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143 |
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144 if (! size_equal (x, y) || ! size_equal (x, z)) |
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145 error ("plot3: x, y, and z must have the same shape"); |
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146 endif |
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147 |
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148 key = options.key; |
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149 if (! isempty (key)) |
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150 set (gca (), "key", "on"); |
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151 endif |
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152 |
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153 tmp(++idx) = line (x(:), y(:), z(:), "keylabel", key, |
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154 "color", options.color, |
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155 "linestyle", options.linestyle, |
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156 "marker", options.marker); |
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157 |
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158 x_set = 0; |
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159 y_set = 0; |
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160 z_set = 0; |
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161 elseif (! x_set) |
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162 x = new; |
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163 x_set = 1; |
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164 elseif (! y_set) |
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165 y = new; |
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166 y_set = 1; |
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167 elseif (! z_set) |
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168 z = new; |
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169 z_set = 1; |
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170 else |
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171 if (isvector (x) && isvector (y)) |
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172 if (isvector (z)) |
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173 x = x(:); |
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174 y = y(:); |
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175 z = z(:); |
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176 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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177 error ("plot3: [length(x), length(y)] must match size(z)"); |
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178 else |
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179 [x, y] = meshgrid (x, y); |
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180 endif |
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181 endif |
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182 |
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183 if (! size_equal (x, y) || ! size_equal (x, z)) |
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184 error ("plot3: x, y, and z must have the same shape"); |
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185 endif |
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186 |
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187 tmp(++idx) = line (x(:), y(:), z(:)); |
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188 |
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189 x = new; |
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190 y_set = 0; |
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191 z_set = 0; |
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192 endif |
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193 |
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194 endfor |
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195 |
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196 ## Handle last plot. |
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197 |
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198 if (x_set) |
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199 if (y_set) |
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200 if (! z_set) |
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201 z = imag (y); |
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202 y = real (y); |
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203 z_set = 1; |
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204 endif |
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205 else |
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206 z = imag (x); |
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207 y = real (x); |
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208 y_set = 1; |
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209 z_set = 1; |
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210 if (rows (x) > 1) |
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211 x = repmat ((1:rows (x))', 1, columns(x)); |
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212 else |
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213 x = 1:columns(x); |
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214 endif |
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215 endif |
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216 |
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217 if (isvector (x) && isvector (y)) |
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218 if (isvector (z)) |
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219 x = x(:); |
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220 y = y(:); |
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221 z = z(:); |
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222 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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223 error ("plot3: [length(x), length(y)] must match size(z)"); |
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224 else |
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225 [x, y] = meshgrid (x, y); |
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226 endif |
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227 endif |
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228 |
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229 if (! size_equal (x, y) || ! size_equal (x, z)) |
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230 error ("plot3: x, y, and z must have the same shape"); |
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231 endif |
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232 |
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233 tmp(++idx) = line (x(:), y(:), z(:)); |
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234 |
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235 endif |
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236 |
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237 set (gca (), "view", [-37.5, 30]); |
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238 |
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239 if (nargout > 0 && idx > 0) |
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240 retval = tmp; |
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241 endif |
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242 |
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243 endfunction |
