Mercurial > octave
view scripts/plot/shrinkfaces.m @ 17281:bc924baa2c4e
doc: Add new @qcode macro for code samples which are quoted.
Macro handles options ("on") or properties ("position") more elegantly
than @code{"text"}.
* doc/interpreter/macros.texi: Add new @qcode macro.
* doc/interpreter/tips.txi: Add documentation about @qcode macro.
* doc/interpreter/basics.txi, doc/interpreter/container.txi,
doc/interpreter/emacs.txi, doc/interpreter/errors.txi,
doc/interpreter/eval.txi, doc/interpreter/expr.txi,
doc/interpreter/external.txi, doc/interpreter/func.txi,
doc/interpreter/grammar.txi, doc/interpreter/image.txi,
doc/interpreter/install.txi, doc/interpreter/interp.txi,
doc/interpreter/io.txi, doc/interpreter/matrix.txi,
doc/interpreter/numbers.txi, doc/interpreter/oop.txi,
doc/interpreter/package.txi, doc/interpreter/plot.txi,
doc/interpreter/quad.txi, doc/interpreter/sparse.txi,
doc/interpreter/strings.txi, doc/interpreter/system.txi,
doc/interpreter/vectorize.txi, libinterp/corefcn/balance.cc,
libinterp/corefcn/bitfcns.cc, libinterp/corefcn/cellfun.cc,
libinterp/corefcn/conv2.cc, libinterp/corefcn/data.cc,
libinterp/corefcn/debug.cc, libinterp/corefcn/defaults.cc,
libinterp/corefcn/dirfns.cc, libinterp/corefcn/dlmread.cc,
libinterp/corefcn/error.cc, libinterp/corefcn/file-io.cc,
libinterp/corefcn/find.cc, libinterp/corefcn/gammainc.cc,
libinterp/corefcn/graphics.cc, libinterp/corefcn/help.cc,
libinterp/corefcn/hex2num.cc, libinterp/corefcn/input.cc,
libinterp/corefcn/load-path.cc, libinterp/corefcn/load-save.cc,
libinterp/corefcn/ls-oct-ascii.cc, libinterp/corefcn/lu.cc,
libinterp/corefcn/luinc.cc, libinterp/corefcn/matrix_type.cc,
libinterp/corefcn/oct-hist.cc, libinterp/corefcn/pager.cc,
libinterp/corefcn/pr-output.cc, libinterp/corefcn/pt-jit.cc,
libinterp/corefcn/qz.cc, libinterp/corefcn/rand.cc,
libinterp/corefcn/regexp.cc, libinterp/corefcn/schur.cc,
libinterp/corefcn/sighandlers.cc, libinterp/corefcn/sparse.cc,
libinterp/corefcn/spparms.cc, libinterp/corefcn/str2double.cc,
libinterp/corefcn/svd.cc, libinterp/corefcn/symtab.cc,
libinterp/corefcn/syscalls.cc, libinterp/corefcn/toplev.cc,
libinterp/corefcn/tril.cc, libinterp/corefcn/typecast.cc,
libinterp/corefcn/utils.cc, libinterp/corefcn/variables.cc,
libinterp/dldfcn/__init_fltk__.cc, libinterp/dldfcn/chol.cc,
libinterp/dldfcn/colamd.cc, libinterp/dldfcn/fftw.cc, libinterp/dldfcn/qr.cc,
libinterp/dldfcn/symbfact.cc, libinterp/octave-value/ov-base.cc,
libinterp/octave-value/ov-fcn-handle.cc,
libinterp/octave-value/ov-fcn-inline.cc, libinterp/octave-value/ov-java.cc,
libinterp/octave-value/ov-range.cc, libinterp/octave-value/ov-struct.cc,
libinterp/octave-value/ov-usr-fcn.cc, libinterp/parse-tree/oct-parse.in.yy,
libinterp/parse-tree/pt-binop.cc, libinterp/parse-tree/pt-eval.cc,
libinterp/parse-tree/pt-mat.cc, scripts/@ftp/ftp.m,
scripts/deprecated/java_convert_matrix.m, scripts/deprecated/java_debug.m,
scripts/deprecated/java_unsigned_conversion.m, scripts/deprecated/shell_cmd.m,
scripts/general/dblquad.m, scripts/general/display.m,
scripts/general/genvarname.m, scripts/general/idivide.m,
scripts/general/interp1.m, scripts/general/interp2.m,
scripts/general/interp3.m, scripts/general/interpn.m, scripts/general/isa.m,
scripts/general/profexplore.m, scripts/general/profile.m,
scripts/general/quadgk.m, scripts/general/randi.m, scripts/general/structfun.m,
scripts/general/subsindex.m, scripts/general/triplequad.m,
scripts/geometry/griddata.m, scripts/geometry/griddata3.m,
scripts/geometry/griddatan.m, scripts/geometry/voronoi.m, scripts/help/help.m,
scripts/help/lookfor.m, scripts/image/cmpermute.m, scripts/image/colormap.m,
scripts/image/image.m, scripts/image/imagesc.m, scripts/image/imfinfo.m,
scripts/image/imformats.m, scripts/image/imread.m, scripts/image/imshow.m,
scripts/image/imwrite.m, scripts/image/ind2gray.m, scripts/image/lines.m,
scripts/image/rgb2ind.m, scripts/image/spinmap.m, scripts/io/dlmwrite.m,
scripts/io/strread.m, scripts/io/textread.m, scripts/io/textscan.m,
scripts/java/javaclasspath.m, scripts/java/usejava.m,
scripts/miscellaneous/bzip2.m, scripts/miscellaneous/computer.m,
scripts/miscellaneous/copyfile.m, scripts/miscellaneous/debug.m,
scripts/miscellaneous/dos.m, scripts/miscellaneous/edit.m,
scripts/miscellaneous/gzip.m, scripts/miscellaneous/license.m,
scripts/miscellaneous/mkoctfile.m, scripts/miscellaneous/movefile.m,
scripts/miscellaneous/parseparams.m, scripts/miscellaneous/unix.m,
scripts/optimization/fminbnd.m, scripts/optimization/fminsearch.m,
scripts/optimization/fminunc.m, scripts/optimization/fsolve.m,
scripts/optimization/fzero.m, scripts/optimization/glpk.m,
scripts/optimization/lsqnonneg.m, scripts/optimization/optimset.m,
scripts/optimization/pqpnonneg.m, scripts/pkg/pkg.m, scripts/plot/allchild.m,
scripts/plot/ancestor.m, scripts/plot/area.m, scripts/plot/axis.m,
scripts/plot/bar.m, scripts/plot/barh.m, scripts/plot/box.m,
scripts/plot/caxis.m, scripts/plot/cla.m, scripts/plot/clabel.m,
scripts/plot/clf.m, scripts/plot/close.m, scripts/plot/colorbar.m,
scripts/plot/daspect.m, scripts/plot/ezmesh.m, scripts/plot/ezmeshc.m,
scripts/plot/ezsurf.m, scripts/plot/ezsurfc.m, scripts/plot/findall.m,
scripts/plot/findobj.m, scripts/plot/gcbo.m, scripts/plot/gcf.m,
scripts/plot/gco.m, scripts/plot/grid.m, scripts/plot/guihandles.m,
scripts/plot/hdl2struct.m, scripts/plot/hidden.m, scripts/plot/hold.m,
scripts/plot/isonormals.m, scripts/plot/isosurface.m, scripts/plot/legend.m,
scripts/plot/mesh.m, scripts/plot/meshc.m, scripts/plot/meshz.m,
scripts/plot/newplot.m, scripts/plot/orient.m, scripts/plot/pareto.m,
scripts/plot/patch.m, scripts/plot/pbaspect.m, scripts/plot/pcolor.m,
scripts/plot/plot.m, scripts/plot/print.m,
scripts/plot/private/__add_default_menu__.m, scripts/plot/quiver.m,
scripts/plot/quiver3.m, scripts/plot/refreshdata.m, scripts/plot/saveas.m,
scripts/plot/scatter.m, scripts/plot/scatter3.m, scripts/plot/shading.m,
scripts/plot/shrinkfaces.m, scripts/plot/slice.m, scripts/plot/stem.m,
scripts/plot/stem3.m, scripts/plot/struct2hdl.m, scripts/plot/subplot.m,
scripts/plot/surf.m, scripts/plot/surfc.m, scripts/plot/surfl.m,
scripts/plot/tetramesh.m, scripts/plot/uigetfile.m, scripts/plot/uimenu.m,
scripts/plot/uiputfile.m, scripts/plot/waterfall.m, scripts/plot/whitebg.m,
scripts/plot/xlim.m, scripts/plot/ylim.m, scripts/plot/zlim.m,
scripts/polynomial/conv.m, scripts/polynomial/polyout.m,
scripts/polynomial/splinefit.m, scripts/set/ismember.m, scripts/set/powerset.m,
scripts/set/setdiff.m, scripts/set/union.m, scripts/set/unique.m,
scripts/signal/detrend.m, scripts/signal/filter2.m, scripts/signal/freqz.m,
scripts/signal/periodogram.m, scripts/signal/spectral_adf.m,
scripts/signal/spectral_xdf.m, scripts/sparse/eigs.m, scripts/sparse/svds.m,
scripts/specfun/legendre.m, scripts/special-matrix/gallery.m,
scripts/statistics/base/mean.m, scripts/statistics/base/moment.m,
scripts/statistics/tests/cor_test.m,
scripts/statistics/tests/kolmogorov_smirnov_test.m,
scripts/statistics/tests/kolmogorov_smirnov_test_2.m,
scripts/statistics/tests/kruskal_wallis_test.m,
scripts/statistics/tests/prop_test_2.m, scripts/statistics/tests/sign_test.m,
scripts/statistics/tests/t_test.m, scripts/statistics/tests/t_test_2.m,
scripts/statistics/tests/t_test_regression.m,
scripts/statistics/tests/u_test.m, scripts/statistics/tests/var_test.m,
scripts/statistics/tests/welch_test.m,
scripts/statistics/tests/wilcoxon_test.m, scripts/statistics/tests/z_test.m,
scripts/statistics/tests/z_test_2.m, scripts/strings/base2dec.m,
scripts/strings/index.m, scripts/strings/isstrprop.m,
scripts/strings/mat2str.m, scripts/strings/regexptranslate.m,
scripts/strings/rindex.m, scripts/strings/str2num.m, scripts/strings/strcat.m,
scripts/strings/strjust.m, scripts/strings/strmatch.m,
scripts/strings/validatestring.m, scripts/testfun/demo.m,
scripts/testfun/example.m, scripts/testfun/test.m, scripts/time/addtodate.m,
scripts/time/asctime.m, scripts/time/datestr.m, scripts/time/datetick.m,
scripts/time/weekday.m, scripts/ui/errordlg.m, scripts/ui/helpdlg.m,
scripts/ui/inputdlg.m, scripts/ui/listdlg.m, scripts/ui/msgbox.m,
scripts/ui/questdlg.m, scripts/ui/warndlg.m: Use new @qcode macro.
author | Rik <rik@octave.org> |
---|---|
date | Mon, 19 Aug 2013 20:46:38 -0700 |
parents | eaab03308c0b |
children |
line wrap: on
line source
## Copyright (C) 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} {} shrinkfaces (@var{p}, @var{sf}) ## @deftypefnx {Function File} {@var{nfv} =} shrinkfaces (@var{p}, @var{sf}) ## @deftypefnx {Function File} {@var{nfv} =} shrinkfaces (@var{fv}, @var{sf}) ## @deftypefnx {Function File} {@var{nfv} =} shrinkfaces (@var{f}, @var{v}, @var{sf}) ## @deftypefnx {Function File} {[@var{nf}, @var{nv}] =} shrinkfaces (@dots{}) ## ## Reduce the faces area for a given patch, structure or explicit faces ## and points matrices by a scale factor @var{sf}. The structure ## @var{fv} must contain the fields @qcode{"faces"} and @qcode{"vertices"}. ## If the factor @var{sf} is omitted then a default of 0.3 is used. ## ## Given a patch handle as the first input argument and no output ## parameters, perform the shrinking of the patch faces in place and ## redraw the patch. ## ## If called with one output argument, return a structure with fields ## @qcode{"faces"}, @qcode{"vertices"}, and @qcode{"facevertexcdata"} ## containing the data after shrinking which can then directly be used as an ## input argument for the @code{patch} function. ## ## Performing the shrinking on faces which are not convex can lead to ## undesired results. ## ## For example, ## ## @example ## @group ## [phi r] = meshgrid (linspace (0, 1.5*pi, 16), linspace (1, 2, 4)); ## tri = delaunay (phi(:), r(:)); ## v = [r(:).*sin(phi(:)) r(:).*cos(phi(:))]; ## clf () ## p = patch ("Faces", tri, "Vertices", v, "FaceColor", "none"); ## fv = shrinkfaces (p); ## patch (fv) ## axis equal ## grid on ## @end group ## @end example ## ## @noindent ## draws a triangulated 3/4 circle and the corresponding shrunken ## version. ## @seealso{patch} ## @end deftypefn ## Author: Martin Helm <martin@mhelm.de> function [nf, nv] = shrinkfaces (varargin) if (nargin < 1 || nargin > 3 || nargout > 2) print_usage (); endif sf = 0.3; p = varargin{1}; colors = []; if (ishandle (p) && nargin < 3) faces = get (p, "Faces"); vertices = get (p, "Vertices"); colors = get (p, "FaceVertexCData"); if (nargin == 2) sf = varargin{2}; endif elseif (isstruct (p) && nargin < 3) faces = p.faces; vertices = p.vertices; if (isfield (p, "facevertexcdata")) colors = p.facevertexcdata; endif if (nargin == 2) sf = varargin{2}; endif elseif (ismatrix (p) && nargin >= 2 && ismatrix (varargin{2})) faces = p; vertices = varargin{2}; if (nargin == 3) sf = varargin{3}; endif else print_usage (); endif if (! isscalar (sf) || sf <= 0) error ("shrinkfaces: scale factor must be a positive scalar"); endif n = columns (vertices); if (n < 2 || n > 3) error ("shrinkfaces: only 2-D and 3-D patches are supported"); endif m = columns (faces); if (m < 3) error ("shrinkfaces: faces must consist of at least 3 vertices"); endif v = vertices(faces'(:), :); if (isempty (colors) || rows (colors) == rows (faces)) c = colors; elseif (rows (colors) == rows (vertices)) c = colors(faces'(:), :); else ## Discard inconsistent color data. c = []; endif sv = rows (v); ## we have to deal with a probably very large number of vertices, so ## use sparse we use as midpoint (1/m, ..., 1/m) in generalized ## barycentric coordinates. midpoints = full (kron ( speye (sv / m), ones (m, m) / m) * sparse (v)); v = sqrt (sf) * (v - midpoints) + midpoints; f = reshape (1:sv, m, sv / m)'; switch (nargout) case 0 if (ishandle (p)) ## avoid exceptions set (p, "FaceVertexCData", [], "CData", []); set (p, "Vertices", v, "Faces", f, "FaceVertexCData", c); else nf = struct ("faces", f, "vertices", v, "facevertexcdata", c); endif case 1 nf = struct ("faces", f, "vertices", v, "facevertexcdata", c); case 2 nf = f; nv = v; endswitch endfunction %!demo %! clf; %! faces = [1 2 3; 1 3 4]; %! vertices = [0 0; 1 0; 1 1; 0 1]; %! patch ('Faces', faces, 'Vertices', vertices, 'FaceColor', 'none'); %! fv = shrinkfaces (faces, vertices, 0.25); %! patch (fv); %! axis equal; %!demo %! clf; %! faces = [1 2 3 4; 5 6 7 8]; %! vertices = [0 0; 1 0; 2 1; 1 1; 2 0; 3 0; 4 1; 3.5 1]; %! patch ('Faces', faces, 'Vertices', vertices, 'FaceColor', 'none'); %! fv = shrinkfaces (faces, vertices, 0.25); %! patch (fv); %! axis equal; %! grid on; %!demo %! clf; %! faces = [1 2 3 4]; %! vertices = [-1 2; 0 0; 1 2; 0 1]; %! patch ('Faces', faces, 'Vertices', vertices, 'FaceColor', 'none'); %! fv = shrinkfaces (faces, vertices, 0.25); %! patch (fv); %! axis equal; %! grid on; %! title 'faces which are not convex are clearly not allowed' %!demo %! clf; %! [phi r] = meshgrid (linspace (0, 1.5*pi, 16), linspace (1, 2, 4)); %! tri = delaunay (phi(:), r(:)); %! v = [r(:).*sin(phi(:)) r(:).*cos(phi(:))]; %! p = patch ('Faces', tri, 'Vertices', v, 'FaceColor', 'none'); %! fv = shrinkfaces (p); %! patch (fv); %! axis equal; %! grid on; %!demo %! clf; %! N = 10; % N intervals per axis %! [x, y, z] = meshgrid (linspace (-4,4,N+1)); %! val = x.^3 + y.^3 + z.^3; %! fv = isosurface (x, y, z, val, 3, z); %! %! p = patch ('Faces', fv.faces, 'Vertices', fv.vertices, 'FaceVertexCData', ... %! fv.facevertexcdata, 'FaceColor', 'interp', 'EdgeColor', 'black'); %! axis equal; %! view (115, 30); %! drawnow; %! shrinkfaces (p, 0.6); %!shared faces, vertices, nfv, nfv2 %! faces = [1 2 3]; %! vertices = [0 0 0; 1 0 0; 1 1 0]; %! nfv = shrinkfaces (faces, vertices, 0.7); %! nfv2 = shrinkfaces (nfv, 1/0.7); %!assert (isfield (nfv, "faces")) %!assert (isfield (nfv, "vertices")) %!assert (size (nfv.faces), [1 3]) %!assert (size (nfv.vertices), [3 3]) %!assert (norm (nfv2.vertices - vertices), 0, 2*eps)