Mercurial > octave
view scripts/plot/draw/isocolors.m @ 25054:6652d3823428 stable
maint: Update copyright dates in all source files.
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 30 Mar 2018 09:19:05 -0400 |
parents | 194eb4bd202b |
children | 00f796120a6d |
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## Copyright (C) 2009-2018 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 ## <https://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {} {@var{cdat} =} isocolors (@var{c}, @var{v}) ## @deftypefnx {} {@var{cdat} =} isocolors (@var{x}, @var{y}, @var{z}, @var{c}, @var{v}) ## @deftypefnx {} {@var{cdat} =} isocolors (@var{x}, @var{y}, @var{z}, @var{r}, @var{g}, @var{b}, @var{v}) ## @deftypefnx {} {@var{cdat} =} isocolors (@var{r}, @var{g}, @var{b}, @var{v}) ## @deftypefnx {} {@var{cdat} =} isocolors (@dots{}, @var{p}) ## @deftypefnx {} {} isocolors (@dots{}) ## ## Compute isosurface colors. ## ## If called with one output argument, and the first input argument @var{c} ## is a three-dimensional array that contains indexed color values, and the ## second input argument @var{v} are the vertices of an isosurface geometry, ## then return a matrix @var{cdat} with color data information for the geometry ## at computed points @code{[x, y, z] = meshgrid (1:l, 1:m, 1:n)}. The output ## argument @var{cdat} can be used to manually set the ## @qcode{"FaceVertexCData"} property of an isosurface patch object. ## ## If called with additional input arguments @var{x}, @var{y} and @var{z} which ## are three-dimensional arrays of the same size as @var{c} then the ## color data is taken at those specified points. ## ## Instead of indexed color data @var{c}, @code{isocolors} can also be called ## with RGB values @var{r}, @var{g}, @var{b}. If input arguments @var{x}, ## @var{y}, @var{z} are not given then @code{meshgrid} computed values are ## used. ## ## Optionally, a patch handle @var{p} can be given as the last input argument ## to all function call variations and the vertex data will be extracted ## from the isosurface patch object. Finally, if no output argument is given ## then the colors of the patch given by the patch handle @var{p} are changed. ## ## @seealso{isosurface, isonormals} ## @end deftypefn ## Author: Martin Helm <martin@mhelm.de> function cdat = 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 (isnumeric (vp) && columns (vp) == 3) pa = []; v = vp; elseif (isgraphics (vp, "patch")) pa = vp; v = get (pa, "Vertices"); else error ("isocolors: last argument must be a vertex list or patch handle"); endif if (calc_rgb) new_colors = zeros (rows (v), 3); new_colors(:,1) = __interp_cube__ ("isocolors", x, y, z, R, v, "values"); new_colors(:,2) = __interp_cube__ ("isocolors", x, y, z, G, v, "values"); new_colors(:,3) = __interp_cube__ ("isocolors", x, y, z, B, v, "values"); else new_colors = __interp_cube__ ("isocolors", x, y, z, c, v, "values"); endif if (nargout == 0) if (! isempty (pa)) set (pa, "FaceVertexCData", new_colors); endif else cdat = new_colors; endif endfunction %!demo %! function isofinish (p) %! set (gca, "PlotBoxAspectRatioMode", "manual", ... %! "PlotBoxAspectRatio", [1 1 1]); %! set (p, "FaceColor", "interp"); %! set (p, "FaceLighting", "flat"); %! light ("Position", [1 1 5]); %! 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); %! clf; %! %! 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 color data %! isocolors (x, y, z, cdat, p); # Directly set colors of patch %! title ("random colors for patch handle"); %! isofinish (p); %! %! 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 %! title ('random colors for "FaceVertexCData"'); %! 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 for patch %! set (p, "FaceVertexCData", cdat); # Set color data manually %! title ('random RGB colors for "FaceVertexCData"'); %! 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); %! title ('gray shades for "FaceVertexCData"'); %! isofinish (p); %!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 (rows (cdat) == rows (v)); ## Test input validation %!error isocolors () %!error isocolors (1) %!error isocolors (1,2,3) %!error isocolors (1,2,3,4,5,6) %!error isocolors (1,2,3,4,5,6,7,8) %!error <last argument must be a vertex list> isocolors (1, {1}) %!error <last argument must be a vertex list> isocolors (1, [1 2 3 4]) %!error <last argument must be a .*patch handle> isocolors (1, 0)