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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 newplot (); |
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99 |
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100 x_set = 0; |
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101 y_set = 0; |
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102 z_set = 0; |
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103 property_set = 0; |
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104 fmt_set = 0; |
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105 properties = {}; |
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106 |
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107 idx = 0; |
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108 |
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109 ## Gather arguments, decode format, and plot lines. |
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110 arg = 0; |
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111 while (arg++ < nargin) |
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112 new = varargin{arg}; |
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113 new_cell = varargin(arg); |
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114 |
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115 if (property_set) |
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116 properties = [properties, new_cell]; |
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117 property_set = 0; |
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118 continue; |
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119 endif |
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120 |
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121 if (ischar (new)) |
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122 if (! z_set) |
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123 if (! y_set) |
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124 if (! x_set) |
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125 error ("plot3: needs x, [ y, [ z ] ]"); |
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126 else |
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127 z = imag (x); |
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128 y = real (x); |
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129 y_set = 1; |
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130 z_set = 1; |
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131 if (rows(x) > 1) |
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132 x = repmat ((1:rows(x))', 1, columns(x)); |
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133 else |
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134 x = 1:columns(x); |
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135 endif |
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136 endif |
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137 else |
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138 z = imag (y); |
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139 y = real (y); |
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140 z_set = 1; |
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141 endif |
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142 endif |
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143 |
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144 if (! fmt_set) |
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145 [options, valid] = __pltopt__ ("plot3", new, false); |
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146 if (! valid) |
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147 properties = [properties, new_cell]; |
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148 property_set = 1; |
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149 continue; |
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150 else |
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151 fmt_set = 1; |
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152 while (arg < nargin && ischar (varargin{arg+1})) |
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153 if (nargin - arg < 2) |
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154 error ("plot3: properties must appear followed by a value"); |
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155 endif |
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156 properties = [properties, varargin(arg:arg+1)]; |
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157 arg += 2; |
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158 endwhile |
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159 endif |
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160 else |
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161 properties = [properties, new_cell]; |
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162 property_set = 1; |
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163 continue; |
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164 endif |
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165 |
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166 if (isvector (x) && isvector (y)) |
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167 if (isvector (z)) |
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168 x = x(:); |
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169 y = y(:); |
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170 z = z(:); |
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171 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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172 error ("plot3: [length(x), length(y)] must match size(z)"); |
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173 else |
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174 [x, y] = meshgrid (x, y); |
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175 endif |
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176 endif |
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177 |
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178 if (! size_equal (x, y) || ! size_equal (x, z)) |
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179 error ("plot3: x, y, and z must have the same shape"); |
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180 endif |
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181 |
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182 key = options.key; |
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183 if (! isempty (key)) |
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184 set (gca (), "key", "on"); |
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185 endif |
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186 color = options.color; |
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187 if (isempty (options.color)) |
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188 color = __next_line_color__ (); |
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189 endif |
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190 |
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191 tmp(++idx) = line (x(:), y(:), z(:), "keylabel", key, "color", color, |
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192 "linestyle", options.linestyle, |
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193 "marker", options.marker, properties{:}); |
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194 |
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195 x_set = 0; |
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196 y_set = 0; |
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197 z_set = 0; |
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198 fmt_set = 0; |
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199 properties = {}; |
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200 elseif (! x_set) |
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201 x = new; |
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202 x_set = 1; |
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203 elseif (! y_set) |
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204 y = new; |
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205 y_set = 1; |
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206 elseif (! z_set) |
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207 z = new; |
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208 z_set = 1; |
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209 else |
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210 if (isvector (x) && isvector (y)) |
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211 if (isvector (z)) |
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212 x = x(:); |
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213 y = y(:); |
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214 z = z(:); |
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215 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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216 error ("plot3: [length(x), length(y)] must match size(z)"); |
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217 else |
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218 [x, y] = meshgrid (x, y); |
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219 endif |
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220 endif |
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221 |
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222 if (! size_equal (x, y) || ! size_equal (x, z)) |
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223 error ("plot3: x, y, and z must have the same shape"); |
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224 endif |
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225 |
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226 options = __default_plot_options__ (); |
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227 key = options.key; |
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228 if (! isempty (key)) |
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229 set (gca (), "key", "on"); |
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230 endif |
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231 color = options.color; |
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232 if (isempty (color)) |
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233 color = __next_line_color__ (); |
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234 endif |
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235 |
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236 tmp(++idx) = line (x(:), y(:), z(:), "keylabel", key, "color", color, |
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237 "linestyle", options.linestyle, |
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238 "marker", options.marker, properties{:}); |
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239 |
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240 x = new; |
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241 y_set = 0; |
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242 z_set = 0; |
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243 fmt_set = 0; |
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244 properties = {}; |
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245 endif |
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246 |
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247 endwhile |
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248 |
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249 if (property_set) |
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250 error ("plot3: properties must appear followed by a value"); |
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251 endif |
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252 |
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253 ## Handle last plot. |
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254 |
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255 if (x_set) |
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256 if (y_set) |
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257 if (! z_set) |
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258 z = imag (y); |
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259 y = real (y); |
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260 z_set = 1; |
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261 endif |
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262 else |
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263 z = imag (x); |
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264 y = real (x); |
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265 y_set = 1; |
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266 z_set = 1; |
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267 if (rows (x) > 1) |
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268 x = repmat ((1:rows (x))', 1, columns(x)); |
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269 else |
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270 x = 1:columns(x); |
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271 endif |
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272 endif |
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273 |
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274 if (isvector (x) && isvector (y)) |
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275 if (isvector (z)) |
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276 x = x(:); |
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277 y = y(:); |
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278 z = z(:); |
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279 elseif (length (x) == rows (z) && length (y) == columns (z)) |
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280 error ("plot3: [length(x), length(y)] must match size(z)"); |
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281 else |
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282 [x, y] = meshgrid (x, y); |
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283 endif |
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284 endif |
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285 |
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286 if (! size_equal (x, y) || ! size_equal (x, z)) |
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287 error ("plot3: x, y, and z must have the same shape"); |
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288 endif |
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289 |
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290 options = __default_plot_options__ (); |
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291 key = options.key; |
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292 if (! isempty (key)) |
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293 set (gca (), "key", "on"); |
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294 endif |
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295 color = options.color; |
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296 if (isempty (color)) |
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297 color = __next_line_color__ (); |
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298 endif |
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299 |
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300 tmp(++idx) = line (x(:), y(:), z(:), "keylabel", key, "color", color, |
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301 "linestyle", options.linestyle, |
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302 "marker", options.marker, properties{:}); |
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303 endif |
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304 |
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305 set (gca (), "view", [-37.5, 30]); |
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306 |
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307 if (nargout > 0 && idx > 0) |
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308 retval = tmp; |
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309 endif |
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310 |
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311 endfunction |
