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annotate doc/interpreter/geometryimages.m @ 20351:d8992a16643c

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doc: Clean up m-files which generate images for Manual. * geometryimages.m, interpimages.m, plotimages.m, sparseimages.m, splineimages.m: Use the same style throughout the mi-files. Obey Octave coding conventions.
author Rik <rik@octave.org>
date Thu, 09 Jul 2015 21:38:57 -0700
parents c3c1fb44f9b5
children b439ccc9a162
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
19731
4197fc428c7d maint: Update copyright notices for 2015.
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2007-2015 David Bateman
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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
fd42779a8428 [project @ 2007-10-13 00:52:12 by jwe]
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 function geometryimages (d, nm, typ)
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20 graphics_toolkit ("gnuplot");
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21 set_print_size ();
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22 hide_output ();
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23 outfile = fullfile (d, [nm "." typ]);
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24 if (strcmp (typ, "png"))
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25 set (0, "defaulttextfontname", "*");
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26 endif
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27 if (strcmp (typ, "eps"))
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28 d_typ = "-depsc2";
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29 else
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30 d_typ = ["-d" typ];
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31 endif
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32
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33 if (! __have_feature__ ("QHULL")
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34 && any (strcmp (nm, {"voronoi", "griddata", "convhull", "delaunay", ...
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35 "triplot"})))
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36 sombreroimage (nm, typ, d_typ);
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37 elseif (strcmp (typ, "txt"))
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38 image_as_txt (d, nm);
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39 elseif (strcmp (nm, "voronoi"))
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40 rand ("state", 9);
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41 x = rand (10, 1);
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42 y = rand (10, 1);
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43 tri = delaunay (x, y);
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44 [vx, vy] = voronoi (x, y, tri);
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45 triplot (tri, x, y, "b");
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46 hold on;
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47 plot (vx, vy, "r");
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48 [r, c] = tri2circ (tri(end,:), x, y);
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49 pc = [-1:0.01:1];
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50 xc = r * sin (pi*pc) + c(1);
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51 yc = r * cos (pi*pc) + c(2);
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52 plot (xc, yc, "g-", "LineWidth", 3);
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53 axis ([0, 1, 0, 1]);
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54 legend ("Delaunay Triangulation", "Voronoi Diagram");
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55 print (outfile, d_typ);
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56 elseif (strcmp (nm, "triplot"))
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57 rand ("state", 2)
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58 x = rand (20, 1);
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59 y = rand (20, 1);
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60 tri = delaunay (x, y);
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61 triplot (tri, x, y);
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62 print (outfile, d_typ);
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63 elseif (strcmp (nm, "griddata"))
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64 rand ("state", 1);
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65 x = 2 * rand (1000,1) - 1;
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66 y = 2 * rand (size (x)) - 1;
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67 z = sin (2 * (x.^2 + y.^2));
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68 [xx,yy] = meshgrid (linspace (-1,1,32));
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69 zz = griddata (x, y, z, xx, yy);
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70 mesh (xx, yy, zz);
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71 print (outfile, d_typ);
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72 elseif (strcmp (nm, "convhull"))
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73 x = -3:0.05:3;
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74 y = abs (sin (x));
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75 k = convhull (x, y);
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76 plot (x(k),y(k),'r-', x,y,'b+');
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77 axis ([-3.05, 3.05, -0.05, 1.05]);
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78 print (outfile, d_typ);
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79 elseif (strcmp (nm, "delaunay"))
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80 rand ("state", 1);
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81 x = rand (1, 10);
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82 y = rand (1, 10);
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83 T = delaunay (x, y);
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84 X = [ x(T(:,1)); x(T(:,2)); x(T(:,3)); x(T(:,1)) ];
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85 Y = [ y(T(:,1)); y(T(:,2)); y(T(:,3)); y(T(:,1)) ];
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86 axis ([0, 1, 0, 1]);
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87 plot (X,Y,"b", x,y,"r*");
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88 print (outfile, d_typ);
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89 elseif (strcmp (nm, "inpolygon"))
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90 randn ("state", 2);
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91 x = randn (100, 1);
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92 y = randn (100, 1);
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93 vx = cos (pi * [-1 : 0.1: 1]);
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94 vy = sin (pi * [-1 : 0.1 : 1]);
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95 in = inpolygon (x, y, vx, vy);
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96 plot (vx, vy, x(in), y(in), "r+", x(!in), y(!in), "bo");
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97 axis ([-2, 2, -2, 2]);
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98 print (outfile, d_typ);
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99 else
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100 error ("unrecognized plot requested");
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101 endif
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102 hide_output ();
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103 endfunction
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104
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105 function [r, c] = tri2circ (tri, xx, yy)
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106 x = xx(tri);
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107 y = yy(tri);
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108 m = (y(1:end-1) - y(2:end)) ./ (x(1:end-1) - x(2:end));
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109 xc = (prod(m) .* (y(1) - y(end)) + m(end)*(x(1)+x(2)) - m(1)*(x(2)+x(3))) ...
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110 ./ (2 * (m(end) - m(1)));
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111 yc = - (xc - (x(2) + x(3))./2) ./ m(end) + (y(2) + y(3)) / 2;
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112 c = [xc, yc];
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113 r = sqrt ((xc - x(1)).^2 + (yc - y(1)).^2);
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114 endfunction
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115
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116 function sombreroimage (nm, typ, d_typ)
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117 if (strcmp (typ, "txt"))
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118 fid = fopen ([nm ".txt"], "wt");
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119 fputs (fid, "+-----------------------------+\n");
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120 fputs (fid, "| Image unavailable because |\n");
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121 fputs (fid, "| of a missing QHULL library. |\n");
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122 fputs (fid, "+-----------------------------+\n");
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123 fclose (fid);
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124 return;
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125 else
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126 hide_output ();
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127 [x, y, z] = sombrero ();
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128 unwind_protect
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129 mesh (x, y, z);
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130 title ("Sorry, graphics not available because Octave was\\ncompiled without the QHULL library.");
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131 unwind_protect_cleanup
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132 print (outfile, d_typ);
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133 hide_output ();
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134 end_unwind_protect
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135 endif
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Rik <rik@octave.org>
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136 endfunction
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137
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Rik <rdrider0-list@yahoo.com>
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138 function set_print_size ()
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139 image_size = [5.0, 3.5]; # in inches, 16:9 format
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140 border = 0; # For postscript use 50/72
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141 set (0, "defaultfigurepapertype", "<custom>");
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142 set (0, "defaultfigurepaperorientation", "landscape");
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143 set (0, "defaultfigurepapersize", image_size + 2*border);
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Rik <rdrider0-list@yahoo.com>
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144 set (0, "defaultfigurepaperposition", [border, border, image_size]);
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3c500bc71e14 [project @ 2007-08-25 00:35:33 by dbateman]
dbateman
parents:
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145 endfunction
3c500bc71e14 [project @ 2007-08-25 00:35:33 by dbateman]
dbateman
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146
3c500bc71e14 [project @ 2007-08-25 00:35:33 by dbateman]
dbateman
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147 ## Use this function before plotting commands and after every call to
3c500bc71e14 [project @ 2007-08-25 00:35:33 by dbateman]
dbateman
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148 ## print since print() resets output to stdout (unfortunately, gnpulot
3c500bc71e14 [project @ 2007-08-25 00:35:33 by dbateman]
dbateman
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149 ## can't pop output as it can the terminal type).
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Rik <rdrider0-list@yahoo.com>
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150 function hide_output ()
20351
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Rik <rik@octave.org>
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151 hf = figure (1);
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Rik <rik@octave.org>
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152 set (hf, "visible", "off");
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dbateman
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153 endfunction
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16e61aecddc1 [project @ 2007-12-05 20:50:47 by jwe]
jwe
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154
16e61aecddc1 [project @ 2007-12-05 20:50:47 by jwe]
jwe
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155 ## generate something for the texinfo @image command to process
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John W. Eaton <jwe@octave.org>
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156 function image_as_txt (d, nm)
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157 fid = fopen (fullfile (d, [nm ".txt"]), "wt");
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jwe
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158 fputs (fid, "\n");
16e61aecddc1 [project @ 2007-12-05 20:50:47 by jwe]
jwe
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159 fputs (fid, "+---------------------------------+\n");
16e61aecddc1 [project @ 2007-12-05 20:50:47 by jwe]
jwe
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160 fputs (fid, "| Image unavailable in text mode. |\n");
16e61aecddc1 [project @ 2007-12-05 20:50:47 by jwe]
jwe
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161 fputs (fid, "+---------------------------------+\n");
16e61aecddc1 [project @ 2007-12-05 20:50:47 by jwe]
jwe
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162 fclose (fid);
16e61aecddc1 [project @ 2007-12-05 20:50:47 by jwe]
jwe
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163 endfunction
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Rik <rik@octave.org>
parents: 16994
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164