Mercurial > octave-nkf
annotate doc/interpreter/geometryimages.m @ 19751:606b05352351
Backout cset 59ad278cfb98, use gnuplot for building doc images.
Until OpenGL supports TeX we need to keep using gnuplot.
| author | Rik <rik@octave.org> |
|---|---|
| date | Sun, 15 Feb 2015 07:13:09 -0800 |
| parents | 1170c849952b |
| children | 4e15a4c331e7 |
| rev | line source |
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1 ## Copyright (C) 2007-2015 David Bateman |
| 7018 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 6832 | 19 function geometryimages (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 (); |
| 7257 | 23 if (strcmp (typ, "png")) |
| 24 set (0, "defaulttextfontname", "*"); | |
| 25 endif | |
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26 if (strcmp (typ, "eps")) |
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27 d_typ = "-depsc2"; |
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28 else |
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29 d_typ = ["-d" typ]; |
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30 endif |
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31 |
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32 if (! __have_feature__ ("QHULL") |
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33 && any (strcmp (nm, {"voronoi", "griddata", "convhull", "delaunay", ... |
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34 "triplot"}))) |
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35 sombreroimage (nm, typ, d_typ); |
| 7262 | 36 elseif (strcmp (typ, "txt")) |
| 37 image_as_txt (nm); | |
| 6855 | 38 elseif (strcmp (nm, "voronoi")) |
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39 rand ("state", 9); |
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40 x = rand (10, 1); |
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41 y = rand (10, 1); |
| 6832 | 42 tri = delaunay (x, y); |
| 43 [vx, vy] = voronoi (x, y, tri); | |
| 44 triplot (tri, x, y, "b"); | |
| 45 hold on; | |
| 46 plot (vx, vy, "r"); | |
| 47 [r, c] = tri2circ (tri(end,:), x, y); | |
| 48 pc = [-1:0.01:1]; | |
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49 xc = r * sin (pi*pc) + c(1); |
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50 yc = r * cos (pi*pc) + c(2); |
| 6832 | 51 plot (xc, yc, "g-", "LineWidth", 3); |
| 52 axis([0, 1, 0, 1]); | |
| 53 legend ("Delaunay Triangulation", "Voronoi Diagram"); | |
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54 print ([nm "." typ], d_typ); |
| 6832 | 55 elseif (strcmp (nm, "triplot")) |
| 56 rand ("state", 2) | |
| 57 x = rand (20, 1); | |
| 58 y = rand (20, 1); | |
| 59 tri = delaunay (x, y); | |
| 60 triplot (tri, x, y); | |
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61 print ([nm "." typ], d_typ); |
| 6832 | 62 elseif (strcmp (nm, "griddata")) |
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63 rand ("state", 1); |
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64 x = 2 * rand (1000,1) - 1; |
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65 y = 2 * rand (size (x)) - 1; |
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66 z = sin (2 * (x.^2 + y.^2)); |
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67 [xx,yy] = meshgrid (linspace (-1,1,32)); |
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68 griddata (x,y,z,xx,yy); |
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69 print ([nm "." typ], d_typ); |
| 6832 | 70 elseif (strcmp (nm, "convhull")) |
| 71 x = -3:0.05:3; | |
| 72 y = abs (sin (x)); | |
| 73 k = convhull (x, y); | |
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74 plot (x(k),y(k),'r-', x,y,'b+'); |
| 6832 | 75 axis ([-3.05, 3.05, -0.05, 1.05]); |
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76 print ([nm "." typ], d_typ); |
| 6832 | 77 elseif (strcmp (nm, "delaunay")) |
| 78 rand ("state", 1); | |
| 6847 | 79 x = rand (1, 10); |
| 80 y = rand (1, 10); | |
| 6832 | 81 T = delaunay (x, y); |
| 82 X = [ x(T(:,1)); x(T(:,2)); x(T(:,3)); x(T(:,1)) ]; | |
| 83 Y = [ y(T(:,1)); y(T(:,2)); y(T(:,3)); y(T(:,1)) ]; | |
| 84 axis ([0, 1, 0, 1]); | |
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85 plot (X,Y,"b", x,y,"r*"); |
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86 print ([nm "." typ], d_typ); |
| 6847 | 87 elseif (strcmp (nm, "inpolygon")) |
| 88 randn ("state", 2); | |
| 89 x = randn (100, 1); | |
| 90 y = randn (100, 1); | |
| 91 vx = cos (pi * [-1 : 0.1: 1]); | |
| 92 vy = sin (pi * [-1 : 0.1 : 1]); | |
| 93 in = inpolygon (x, y, vx, vy); | |
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94 plot (vx, vy, x(in), y(in), "r+", x(!in), y(!in), "bo"); |
| 6847 | 95 axis ([-2, 2, -2, 2]); |
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96 print ([nm "." typ], d_typ); |
| 6832 | 97 else |
| 98 error ("unrecognized plot requested"); | |
| 99 endif | |
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100 hide_output (); |
| 6832 | 101 endfunction |
| 102 | |
| 103 function [r, c] = tri2circ (tri, xx, yy) | |
| 104 x = xx(tri); | |
| 105 y = yy(tri); | |
| 106 m = (y(1:end-1) - y(2:end)) ./ (x(1:end-1) - x(2:end)); | |
| 107 xc = (prod(m) .* (y(1) - y(end)) + m(end)*(x(1)+x(2)) - m(1)*(x(2)+x(3))) ... | |
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108 ./ (2 * (m(end) - m(1))); |
| 6832 | 109 yc = - (xc - (x(2) + x(3))./2) ./ m(end) + (y(2) + y(3)) / 2; |
| 110 c = [xc, yc]; | |
| 111 r = sqrt ((xc - x(1)).^2 + (yc - y(1)).^2); | |
| 112 endfunction | |
| 113 | |
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114 function set_print_size () |
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115 image_size = [5.0, 3.5]; # in inches, 16:9 format |
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116 border = 0; # For postscript use 50/72 |
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117 set (0, "defaultfigurepapertype", "<custom>"); |
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118 set (0, "defaultfigurepaperorientation", "landscape"); |
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119 set (0, "defaultfigurepapersize", image_size + 2*border); |
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120 set (0, "defaultfigurepaperposition", [border, border, image_size]); |
| 6832 | 121 endfunction |
| 122 | |
| 123 ## Use this function before plotting commands and after every call to | |
| 124 ## print since print() resets output to stdout (unfortunately, gnpulot | |
| 125 ## can't pop output as it can the terminal type). | |
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126 function hide_output () |
| 6832 | 127 f = figure (1); |
| 128 set (f, "visible", "off"); | |
| 129 endfunction | |
| 6855 | 130 |
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131 function sombreroimage (nm, typ, d_typ) |
| 6855 | 132 if (strcmp (typ, "txt")) |
| 133 fid = fopen (sprintf ("%s.txt", nm), "wt"); | |
| 134 fputs (fid, "+-----------------------------+\n"); | |
| 135 fputs (fid, "| Image unavailable because |\n"); | |
| 136 fputs (fid, "| of a missing QHULL library. |\n"); | |
| 137 fputs (fid, "+-----------------------------+\n"); | |
| 138 fclose (fid); | |
| 139 return; | |
| 140 else ## if (!strcmp (typ, "txt")) | |
| 141 | |
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142 hide_output (); |
| 6855 | 143 |
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144 [x, y, z] = sombrero (); |
| 6855 | 145 unwind_protect |
| 146 mesh (x, y, z); | |
| 147 title ("Sorry, graphics not available because octave was\\ncompiled without the QHULL library."); | |
| 148 unwind_protect_cleanup | |
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149 print ([nm "." typ], d_typ); |
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150 hide_output (); |
| 6855 | 151 end_unwind_protect |
| 152 endif | |
| 153 endfunction | |
| 7262 | 154 |
| 155 ## generate something for the texinfo @image command to process | |
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156 function image_as_txt (nm) |
| 7262 | 157 fid = fopen (sprintf ("%s.txt", nm), "wt"); |
| 158 fputs (fid, "\n"); | |
| 159 fputs (fid, "+---------------------------------+\n"); | |
| 160 fputs (fid, "| Image unavailable in text mode. |\n"); | |
| 161 fputs (fid, "+---------------------------------+\n"); | |
| 162 fclose (fid); | |
| 163 endfunction | |
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164 |