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annotate scripts/plot/draw/surfl.m @ 19627:446c46af4b42 stable

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strip trailing whitespace from most source files * Makefile.am, NEWS, build-aux/common.mk, configure.ac, doc/Makefile.am, doc/doxyhtml/Makefile.am, doc/interpreter/Makefile.am, doc/interpreter/arith.txi, doc/interpreter/audio.txi, doc/interpreter/basics.txi, doc/interpreter/bugs.txi, doc/interpreter/container.txi, doc/interpreter/cp-idx.txi, doc/interpreter/data.txi, doc/interpreter/debug.txi, doc/interpreter/diagperm.txi, doc/interpreter/diffeq.txi, doc/interpreter/doccheck/README, doc/interpreter/doccheck/spellcheck, doc/interpreter/emacs.txi, doc/interpreter/errors.txi, doc/interpreter/eval.txi, doc/interpreter/expr.txi, doc/interpreter/external.txi, doc/interpreter/fn-idx.txi, doc/interpreter/func.txi, doc/interpreter/geometry.txi, doc/interpreter/geometryimages.m, doc/interpreter/gpl.txi, doc/interpreter/grammar.txi, doc/interpreter/gui.txi, doc/interpreter/image.txi, doc/interpreter/install.txi, doc/interpreter/interp.txi, doc/interpreter/interpimages.m, 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scripts/statistics/distributions/unifrnd.m, scripts/statistics/distributions/wblrnd.m, scripts/statistics/models/module.mk, scripts/statistics/tests/kruskal_wallis_test.m, scripts/strings/base2dec.m, scripts/strings/deblank.m, scripts/strings/dec2base.m, scripts/strings/dec2bin.m, scripts/strings/dec2hex.m, scripts/strings/mat2str.m, scripts/strings/ostrsplit.m, scripts/strings/regexptranslate.m, scripts/strings/str2num.m, scripts/strings/strcat.m, scripts/strings/strjoin.m, scripts/strings/strsplit.m, scripts/strings/strtok.m, scripts/strings/strtrim.m, scripts/strings/strtrunc.m, scripts/strings/substr.m, scripts/testfun/__run_test_suite__.m, scripts/testfun/speed.m, scripts/testfun/test.m, scripts/time/asctime.m, scripts/time/datenum.m, scripts/time/datevec.m, scripts/time/weekday.m, src/Makefile.am, test/Makefile.am, test/build-bc-overload-tests.sh, test/build-sparse-tests.sh, test/jit.tst, test/line-continue.tst: Strip trailing whitespace.
author John W. Eaton <jwe@octave.org>
date Tue, 20 Jan 2015 08:26:57 -0500
parents d63878346099
children 0e1f5a750d00
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1 ## Copyright (C) 2009-2013 Kai Habel
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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 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 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} surfl (@var{z})
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21 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z})
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22 ## @deftypefnx {Function File} {} surfl (@dots{}, @var{lsrc})
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23 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{lsrc}, @var{P})
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24 ## @deftypefnx {Function File} {} surfl (@dots{}, "cdata")
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25 ## @deftypefnx {Function File} {} surfl (@dots{}, "light")
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26 ## @deftypefnx {Function File} {} surfl (@var{hax}, @dots{})
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27 ## @deftypefnx {Function File} {@var{h} =} surfl (@dots{})
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28 ##
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29 ## Plot a 3-D surface using shading based on various lighting models.
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30 ##
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31 ## The surface mesh is plotted using shaded rectangles. The vertices of the
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32 ## rectangles [@var{x}, @var{y}] are typically the output of @code{meshgrid}.
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33 ## over a 2-D rectangular region in the x-y plane. @var{z} determines the
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34 ## height above the plane of each vertex. If only a single @var{z} matrix is
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35 ## given, then it is plotted over the meshgrid
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36 ## @code{@var{x} = 1:columns (@var{z}), @var{y} = 1:rows (@var{z})}.
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37 ## Thus, columns of @var{z} correspond to different @var{x} values and rows
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38 ## of @var{z} correspond to different @var{y} values.
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39 ##
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40 ## The default lighting mode @qcode{"cdata"}, changes the cdata property of the
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41 ## surface object to give the impression of a lighted surface.
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42 ## @strong{Warning:} The alternative mode @qcode{"light"} mode which creates a
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43 ## light object to illuminate the surface is not implemented (yet).
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44 ##
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45 ## The light source location can be specified using @var{lsrc}. It can be given
17122
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46 ## as a 2-element vector [azimuth, elevation] in degrees, or as a 3-element
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47 ## vector [lx, ly, lz]. The default value is rotated 45 degrees
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48 ## counterclockwise to the current view.
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49 ##
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50 ## The material properties of the surface can specified using a 4-element
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51 ## vector @var{P} = [@var{AM} @var{D} @var{SP} @var{exp}] which defaults to
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52 ## @var{p} = [0.55 0.6 0.4 10].
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53 ##
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54 ## @table @asis
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55 ## @item @qcode{"AM"} strength of ambient light
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56 ##
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57 ## @item @qcode{"D"} strength of diffuse reflection
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58 ##
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59 ## @item @qcode{"SP"} strength of specular reflection
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60 ##
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61 ## @item @qcode{"EXP"} specular exponent
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62 ## @end table
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63 ##
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64 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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65 ## rather than the current axes returned by @code{gca}.
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66 ##
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67 ## The optional return value @var{h} is a graphics handle to the created
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68 ## surface object.
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69 ##
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70 ## Example:
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71 ##
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72 ## @example
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73 ## @group
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74 ## colormap (bone (64));
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75 ## surfl (peaks);
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76 ## shading interp;
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77 ## @end group
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78 ## @end example
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79 ## @seealso{diffuse, specular, surf, shading, colormap, caxis}
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80 ## @end deftypefn
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81
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82 ## Author: Kai Habel <kai.habel@gmx.de>
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83
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84 function h = surfl (varargin)
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85
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86 [hax, varargin, nargin] = __plt_get_axis_arg__ ("surfl", varargin{:});
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87
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88 if (nargin == 0)
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89 print_usage ();
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90 endif
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91
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92 ## Check for lighting type.
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93 use_cdata = true;
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94 if (ischar (varargin{end}))
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95 switch (tolower (varargin{end}))
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96 case "light"
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97 warning ("surfl: light method not supported (yet), using cdata method instead");
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98 ## This can be implemented when light objects are supported.
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99 use_cdata = false;
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100 case "cdata"
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101 use_cdata = true;
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102 otherwise
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103 error ("surfl: unknown lighting method");
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104 endswitch
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105 varargin(end) = [];
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106 endif
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107
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108 ## Check for reflection properties argument.
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109 ##
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110 ## r = [ambient light strength,
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111 ## diffuse reflection strength,
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112 ## specular reflection strength,
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113 ## specular shine]
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114 if (isnumeric (varargin{end}) && length (varargin{end}) == 4)
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115 r = varargin{end};
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116 varargin(end) = [];
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117 else
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118 ## Default values.
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119 r = [0.55, 0.6, 0.4, 10];
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120 endif
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121
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122 ## Check for light vector (lv) argument.
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123 have_lv = false;
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124 if (isnumeric (varargin{end}))
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125 len = numel (varargin{end});
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126 lastarg = varargin{end};
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127 if (len == 3)
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128 lv = lastarg;
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129 varargin(end) = [];
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130 have_lv = true;
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131 elseif (len == 2)
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132 [lv(1), lv(2), lv(3)] = sph2cart ((lastarg(1) - 90) * pi/180,
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133 lastarg(2) * pi/180,
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134 1.0);
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135 varargin(end) = [];
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136 have_lv = true;
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137 endif
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138 endif
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139
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140 oldfig = [];
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141 if (! isempty (hax))
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142 oldfig = get (0, "currentfigure");
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143 endif
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144 unwind_protect
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145 hax = newplot (hax);
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146
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147 htmp = surface (varargin{:});
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148 if (! ishold (hax))
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149 set (hax, "view", [-37.5, 30],
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150 "xgrid", "on", "ygrid", "on", "zgrid", "on", "clim", [0 1]);
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151 endif
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152
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153 ## Get view vector (vv).
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154 [az, el] = view ();
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155 vv = sph2cart ((az - 90) * pi/180.0, el * pi/180.0, 1.0);
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156
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157 if (! have_lv)
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158 ## Calculate light vector (lv) from view vector.
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159 phi = pi / 4; # 45 degrees
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160 R = [cos(phi), -sin(phi), 0;
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161 sin(phi), cos(phi), 0;
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162 0, 0, 1];
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163 lv = (R * vv.').';
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164 endif
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165
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166 vn = get (htmp, "vertexnormals");
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167 dar = get (hax, "plotboxaspectratio");
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168 vn(:,:,1) *= dar(1);
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169 vn(:,:,2) *= dar(2);
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170 vn(:,:,3) *= dar(3);
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171
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172 ## Normalize vn.
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173 vn ./= repmat (sqrt (sumsq (vn, 3)), [1, 1, 3]);
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174 [nr, nc] = size (get (htmp, "zdata"));
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175
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176 ## Ambient, diffuse, and specular term.
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177 cdata = ( r(1) * ones (nr, nc)
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178 + r(2) * diffuse (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv)
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179 + r(3) * specular (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv, vv, r(4)));
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180 cdata ./= sum (r(1:3));
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181
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182 set (htmp, "cdata", cdata);
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183
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184 unwind_protect_cleanup
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185 if (! isempty (oldfig))
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186 set (0, "currentfigure", oldfig);
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187 endif
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188 end_unwind_protect
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189
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190 if (nargout > 0)
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191 h = htmp;
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192 endif
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193
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194 endfunction
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195
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196
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197 %!demo
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198 %! clf;
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199 %! [X,Y,Z] = sombrero ();
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200 %! colormap (copper (64));
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201 %! surfl (X,Y,Z);
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202 %! shading interp;
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203 %! title ('surfl() with defaults');
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204
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205 %!demo
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206 %! clf;
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207 %! [X,Y,Z] = sombrero ();
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208 %! colormap (copper (64));
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209 %! [az, el] = view ();
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210 %! surfl (X,Y,Z, [az+225,el], [0.2 0.6 0.4 25]);
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211 %! shading interp;
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212 %! title ('surfl() with lighting vector and material properties');
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213