--- /dev/null
+## Copyright (C) 2009-2012 Martin Helm
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING. If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {[@var{cd}] =} isocolors (@var{c}, @var{v})
+## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@var{x}, @var{y}, @var{z}, @var{c}, @var{v})
+## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@var{x}, @var{y}, @var{z}, @var{r}, @var{g}, @var{b}, @var{v})
+## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@var{r}, @var{g}, @var{b}, @var{v})
+## @deftypefnx {Function File} {[@var{cd}] =} isocolors (@dots{}, @var{p})
+## @deftypefnx {Function File} {} isocolors (@dots{})
+##
+## If called with one output argument and the first input argument
+## @var{c} is a three-dimensional array that contains color values and
+## the second input argument @var{v} keeps the vertices of a geometry
+## then return a matrix @var{cd} with color data information for the
+## geometry at computed points
+## @command{[x, y, z] = meshgrid (1:l, 1:m, 1:n)}. The output argument
+## @var{cd} can be taken to manually set FaceVertexCData of a patch.
+##
+## If called with further input arguments @var{x}, @var{y} and @var{z}
+## which are three--dimensional arrays of the same size than @var{c}
+## then the color data is taken at those given points. Instead of the
+## color data @var{c} this function can also be called with RGB values
+## @var{r}, @var{g}, @var{b}. If input argumnets @var{x}, @var{y},
+## @var{z} are not given then again @command{meshgrid} computed values
+## are taken.
+##
+## Optionally, the patch handle @var{p} can be given as the last input
+## argument to all variations of function calls instead of the vertices
+## data @var{v}. Finally, if no output argument is given then directly
+## change the colors of a patch that is given by the patch handle
+## @var{p}.
+##
+## For example:
+##
+## @example
+## function [] = isofinish (p)
+## set (gca, "PlotBoxAspectRatioMode", "manual", ...
+## "PlotBoxAspectRatio", [1 1 1]);
+## set (p, "FaceColor", "interp");
+## ## set (p, "FaceLighting", "flat");
+## ## light ("Position", [1 1 5]); ## Available with JHandles
+## endfunction
+##
+## N = 15; # Increase number of vertices in each direction
+## iso = .4; # Change isovalue to .1 to display a sphere
+## lin = linspace (0, 2, N);
+## [x, y, z] = meshgrid (lin, lin, lin);
+## c = abs ((x-.5).^2 + (y-.5).^2 + (z-.5).^2);
+## figure (); # Open another figure window
+##
+## subplot (2,2,1); view (-38, 20);
+## [f, v] = isosurface (x, y, z, c, iso);
+## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
+## cdat = rand (size (c)); # Compute random patch color data
+## isocolors (x, y, z, cdat, p); # Directly set colors of patch
+## isofinish (p); # Call user function isofinish
+##
+## subplot (2,2,2); view (-38, 20);
+## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
+## [r, g, b] = meshgrid (lin, 2-lin, 2-lin);
+## cdat = isocolors (x, y, z, c, v); # Compute color data vertices
+## set (p, "FaceVertexCData", cdat); # Set color data manually
+## isofinish (p);
+##
+## subplot (2,2,3); view (-38, 20);
+## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
+## cdat = isocolors (r, g, b, c, p); # Compute color data patch
+## set (p, "FaceVertexCData", cdat); # Set color data manually
+## isofinish (p);
+##
+## subplot (2,2,4); view (-38, 20);
+## p = patch ("Faces", f, "Vertices", v, "EdgeColor", "none");
+## r = g = b = repmat ([1:N] / N, [N, 1, N]); # Black to white
+## cdat = isocolors (x, y, z, r, g, b, v);
+## set (p, "FaceVertexCData", cdat);
+## isofinish (p);
+## @end example
+##
+## @seealso{isosurface, isonormals}
+##
+## @end deftypefn
+
+## Author: Martin Helm <martin@mhelm.de>
+
+function varargout = isocolors(varargin)
+ calc_rgb = false;
+ switch (nargin)
+ case 2
+ c = varargin{1};
+ vp = varargin{2};
+ x = 1:size (c, 2);
+ y = 1:size (c, 1);
+ z = 1:size (c, 3);
+ case 4
+ calc_rgb = true;
+ R = varargin{1};
+ G = varargin{2};
+ B = varargin{3};
+ vp = varargin{4};
+ x = 1:size (R, 1);
+ y = 1:size (R, 2);
+ z = 1:size (R, 3);
+ case 5
+ x = varargin{1};
+ y = varargin{2};
+ z = varargin{3};
+ c = varargin{4};
+ vp = varargin{5};
+ case 7
+ calc_rgb = true;
+ x = varargin{1};
+ y = varargin{2};
+ z = varargin{3};
+ R = varargin{4};
+ G = varargin{5};
+ B = varargin{6};
+ vp = varargin{7};
+ otherwise
+ print_usage ();
+ endswitch
+ if (ismatrix (vp) && size (vp,2) == 3)
+ pa = [];
+ v = vp;
+ elseif ( ishandle (vp) )
+ pa = vp;
+ v = get (pa, "Vertices");
+ else
+ error ("isocolors: last argument is not a vertex list or patch handle");
+ endif
+ if (calc_rgb)
+ new_col = zeros (size (v, 1), 3);
+ new_col(:,1) = __interp_cube__ (x, y, z, R, v, "values" );
+ new_col(:,2) = __interp_cube__ (x, y, z, G, v, "values" );
+ new_col(:,3) = __interp_cube__ (x, y, z, B, v, "values" );
+ else
+ new_col = __interp_cube__ (x, y, z, c, v, "values" );
+ endif
+ switch (nargout)
+ case 0
+ if (!isempty (pa))
+ set (pa, "FaceVertexCData", new_col);
+ endif
+ case 1
+ varargout = {new_col};
+ otherwise
+ print_usage ();
+ endswitch
+endfunction
+
+%!test
+%! [x, y, z] = meshgrid (0:.5:2, 0:.5:2, 0:.5:2);
+%! c = (x-.5).^2 + (y-.5).^2 + (z-.5).^2;
+%! [f, v] = isosurface (x, y, z, c, .4);
+%! cdat = isocolors (x, y, z, c, v);
+%! assert (size (cdat, 1) == size (v, 1));
+## Can't create a patch handle for tests without a figure
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff