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annotate scripts/plot/surfl.m @ 17182:c3c1ebfaa7dc

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maint: Use common indentation for switch statement. * scripts/general/interp1.m, scripts/geometry/delaunay.m, scripts/help/__unimplemented__.m, scripts/image/cmunique.m, scripts/miscellaneous/edit.m, scripts/optimization/fzero.m, scripts/optimization/sqp.m, scripts/plot/__gnuplot_drawnow__.m, scripts/plot/hidden.m, scripts/plot/legend.m, scripts/plot/print.m, scripts/plot/printd.m, scripts/plot/private/__contour__.m, scripts/plot/private/__fltk_print__.m, scripts/plot/private/__gnuplot_print__.m, scripts/plot/private/__go_draw_axes__.m, scripts/plot/private/__print_parse_opts__.m, scripts/signal/periodogram.m, scripts/sparse/bicg.m, test/slice.tst, test/switch.tst: Use common indentation for switch statement.
author Rik <rik@octave.org>
date Sun, 04 Aug 2013 15:11:34 -0700
parents fd9a8b1a8768
children df4c4b7708a4
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1 ## Copyright (C) 2009-2012 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{x}, @var{y}, @var{z})
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21 ## @deftypefnx {Function File} {} surfl (@var{z})
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22 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{L})
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23 ## @deftypefnx {Function File} {} surfl (@var{x}, @var{y}, @var{z}, @var{L}, @var{P})
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24 ## @deftypefnx {Function File} {} surfl (@dots{}, "light")
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25 ## @deftypefnx {Function File} {} surfl (@var{hax}, @dots{})
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26 ## @deftypefnx {Function File} {@var{h} =} surfl (@dots{})
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27 ##
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28 ## Plot a 3-D surface using shading based on various lighting models.
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29 ##
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30 ## The surface mesh is plotted using shaded rectangles. The vertices of the
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31 ## rectangles [@var{x}, @var{y}] are typically the output of @code{meshgrid}.
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32 ## over a 2-D rectangular region in the x-y plane. @var{z} determines the
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33 ## height above the plane of each vertex. If only a single @var{z} matrix is
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34 ## given, then it is plotted over the meshgrid
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35 ## @code{@var{x} = 1:columns (@var{z}), @var{y} = 1:rows (@var{z})}.
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36 ## Thus, columns of @var{z} correspond to different @var{x} values and rows
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37 ## of @var{z} correspond to different @var{y} values.
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38 ##
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39 ## The default lighting mode "cdata", changes the cdata property of the
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40 ## surface object to give the impression of a lighted surface.
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41 ## @strong{Warning:} The alternative mode "light" mode which creates a light
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42 ## object to illuminate the surface is not implemented (yet).
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43 ##
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44 ## The light source location can be specified using @var{L}. It can be given
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45 ## as a 2-element vector [azimuth, elevation] in degrees, or as a 3-element
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46 ## vector [lx, ly, lz]. The default value is rotated 45 degrees
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47 ## counterclockwise to the current view.
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48 ##
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49 ## The material properties of the surface can specified using a 4-element
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50 ## vector @var{P} = [@var{AM} @var{D} @var{SP} @var{exp}] which defaults to
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51 ## @var{p} = [0.55 0.6 0.4 10].
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52 ##
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53 ## @table @asis
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54 ## @item "AM" strength of ambient light
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55 ##
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56 ## @item "D" strength of diffuse reflection
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57 ##
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58 ## @item "SP" strength of specular reflection
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59 ##
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60 ## @item "EXP" specular exponent
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61 ## @end table
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62 ##
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63 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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64 ## rather than the current axes returned by @code{gca}.
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65 ##
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66 ## The optional return value @var{h} is a graphics handle to the created
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67 ## surface object.
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68 ##
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69 ## Example:
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70 ##
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71 ## @example
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72 ## @group
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73 ## colormap (bone (64));
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74 ## surfl (peaks);
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75 ## shading interp;
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76 ## @end group
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77 ## @end example
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78 ## @seealso{diffuse, specular, surf, shading, colormap, caxis}
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79 ## @end deftypefn
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80
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81 ## Author: Kai Habel <kai.habel@gmx.de>
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82
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83 function h = surfl (varargin)
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84
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85 [hax, varargin, nargin] = __plt_get_axis_arg__ ("surfl", varargin{:});
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86
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87 if (nargin == 0)
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88 print_usage ();
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89 endif
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90
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91 ## Check for lighting type.
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92 use_cdata = true;
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93 if (ischar (varargin{end}))
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94 switch (tolower (varargin{end}))
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95 case "light"
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96 warning ("light method not supported (yet), using cdata method instead");
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97 ## This can be implemented when light objects are supported.
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98 use_cdata = false;
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99 case "cdata"
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100 use_cdata = true;
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101 otherwise
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102 error ("surfl: unknown lighting method");
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103 endswitch
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104 varargin(end) = [];
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105 endif
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106
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107 ## Check for reflection properties argument.
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108 ##
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109 ## r = [ambient light strength,
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110 ## diffuse reflection strength,
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111 ## specular reflection strength,
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112 ## specular shine]
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113 if (isnumeric (varargin{end}) && length (varargin{end}) == 4)
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114 r = varargin{end};
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115 varargin(end) = [];
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116 else
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117 ## Default values.
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118 r = [0.55, 0.6, 0.4, 10];
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119 endif
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120
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121 ## Check for light vector (lv) argument.
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122 have_lv = false;
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123 if (isnumeric (varargin{end}))
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124 len = numel (varargin{end});
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125 lastarg = varargin{end};
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126 if (len == 3)
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127 lv = lastarg;
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128 varargin(end) = [];
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129 have_lv = true;
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130 elseif (len == 2)
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131 [lv(1), lv(2), lv(3)] = sph2cart ((lastarg(1) - 90) * pi/180,
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132 lastarg(2) * pi/180,
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133 1.0);
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134 varargin(end) = [];
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135 have_lv = true;
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136 endif
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137 endif
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138
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139 oldfig = ifelse (isempty (hax), [], get (0, "currentfigure"));
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140 unwind_protect
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141 hax = newplot (hax);
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142
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143 htmp = surface (varargin{:});
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144 if (! ishold (hax))
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145 set (hax, "view", [-37.5, 30],
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146 "xgrid", "on", "ygrid", "on", "zgrid", "on", "clim", [0 1]);
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147 endif
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148
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149 ## Get view vector (vv).
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150 [az, el] = view ();
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151 vv = sph2cart ((az - 90) * pi/180.0, el * pi/180.0, 1.0);
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152
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153 if (! have_lv)
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154 ## Calculate light vector (lv) from view vector.
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155 Phi = 45.0 / 180.0 * pi;
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156 R = [cos(Phi), -sin(Phi), 0;
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157 sin(Phi), cos(Phi), 0;
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158 0, 0, 1];
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159 lv = (R * vv.').';
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160 endif
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161
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162 vn = get (htmp, "vertexnormals");
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163 dar = get (hax, "plotboxaspectratio");
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164 vn(:,:,1) *= dar(1);
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165 vn(:,:,2) *= dar(2);
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166 vn(:,:,3) *= dar(3);
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167
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168 ## Normalize vn.
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169 vn = vn ./ repmat (sqrt (sumsq (vn, 3)), [1, 1, 3]);
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170 [nr, nc] = size (get (htmp, "zdata"));
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171
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172 ## Ambient, diffuse, and specular term.
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173 cdata = ( r(1) * ones (nr, nc)
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174 + r(2) * diffuse (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv)
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175 + r(3) * specular (vn(:,:,1), vn(:,:,2), vn(:,:,3), lv, vv, r(4)));
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176
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177 set (htmp, "cdata", cdata ./ sum (r(1:3)));
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178
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179 unwind_protect_cleanup
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180 if (! isempty (oldfig))
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181 set (0, "currentfigure", oldfig);
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182 endif
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183 end_unwind_protect
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184
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185 if (nargout > 0)
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186 h = htmp;
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187 endif
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188
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189 endfunction
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190
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191
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192 %!demo
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193 %! clf;
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194 %! [X,Y,Z] = sombrero ();
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195 %! colormap (copper (64));
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196 %! surfl (X,Y,Z);
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197 %! shading interp;
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198 %! title ('surfl with defaults');
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199
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200 %!demo
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201 %! clf;
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202 %! [X,Y,Z] = sombrero ();
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203 %! colormap (copper (64));
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204 %! [az, el] = view ();
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205 %! surfl (X,Y,Z, [az+225,el], [0.2 0.6 0.4 25]);
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206 %! shading interp;
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207 %! title ('surfl with lighting vector and material properties');
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208