Mercurial > octave-nkf
diff scripts/plot/draw/shrinkfaces.m @ 17572:7bb76a22cde1
maint: Split scripts/plot directory into 4 pieces.
scripts/gui : user-interface functions
scripts/plot/appearance : functions controlling plot appearance
scripts/plot/draw : plotting functions which produce graphs
scripts/plot/util : low-level plotting functions and utilities.
* scripts/gui/guidata.m, scripts/gui/guihandles.m, scripts/gui/module.mk,
scripts/gui/private/__file_filter__.m,
scripts/gui/private/__fltk_file_filter__.m,
scripts/gui/private/__is_function__.m, scripts/gui/private/__uigetdir_fltk__.m,
scripts/gui/private/__uigetfile_fltk__.m,
scripts/gui/private/__uiobject_split_args__.m,
scripts/gui/private/__uiputfile_fltk__.m, scripts/gui/uicontextmenu.m,
scripts/gui/uicontrol.m, scripts/gui/uigetdir.m, scripts/gui/uigetfile.m,
scripts/gui/uimenu.m, scripts/gui/uipanel.m, scripts/gui/uipushtool.m,
scripts/gui/uiputfile.m, scripts/gui/uiresume.m, scripts/gui/uitoggletool.m,
scripts/gui/uitoolbar.m, scripts/gui/uiwait.m, scripts/gui/waitbar.m,
scripts/gui/waitforbuttonpress.m: Moved from scripts/plot to scripts/gui
* scripts/plot/appearance/__clabel__.m,
scripts/plot/appearance/__getlegenddata__.m, scripts/plot/appearance/axis.m,
scripts/plot/appearance/box.m, scripts/plot/appearance/caxis.m,
scripts/plot/appearance/clabel.m, scripts/plot/appearance/daspect.m,
scripts/plot/appearance/diffuse.m, scripts/plot/appearance/grid.m,
scripts/plot/appearance/gtext.m, scripts/plot/appearance/hidden.m,
scripts/plot/appearance/legend.m,
scripts/plot/appearance/orient.m, scripts/plot/appearance/pbaspect.m,
scripts/plot/appearance/private/__axis_label__.m,
scripts/plot/appearance/private/__axis_limits__.m,
scripts/plot/appearance/shading.m, scripts/plot/appearance/specular.m,
scripts/plot/appearance/text.m, scripts/plot/appearance/title.m,
scripts/plot/appearance/view.m, scripts/plot/appearance/whitebg.m,
scripts/plot/appearance/xlabel.m, scripts/plot/appearance/xlim.m,
scripts/plot/appearance/ylabel.m, scripts/plot/appearance/ylim.m,
scripts/plot/appearance/zlabel.m, scripts/plot/appearance/zlim.m:
Moved from scripts/plot to subdir appearance.
* scripts/plot/draw/area.m, scripts/plot/draw/bar.m, scripts/plot/draw/barh.m,
scripts/plot/draw/colorbar.m, scripts/plot/draw/comet.m,
scripts/plot/draw/comet3.m, scripts/plot/draw/compass.m,
scripts/plot/draw/contour.m, scripts/plot/draw/contour3.m,
scripts/plot/draw/contourc.m, scripts/plot/draw/contourf.m,
scripts/plot/draw/cylinder.m, scripts/plot/draw/ellipsoid.m,
scripts/plot/draw/errorbar.m, scripts/plot/draw/ezcontour.m,
scripts/plot/draw/ezcontourf.m, scripts/plot/draw/ezmesh.m,
scripts/plot/draw/ezmeshc.m, scripts/plot/draw/ezplot.m,
scripts/plot/draw/ezplot3.m, scripts/plot/draw/ezpolar.m,
scripts/plot/draw/ezsurf.m, scripts/plot/draw/ezsurfc.m,
scripts/plot/draw/feather.m, scripts/plot/draw/fill.m,
scripts/plot/draw/fplot.m, scripts/plot/draw/hist.m,
scripts/plot/draw/isocolors.m, scripts/plot/draw/isonormals.m,
scripts/plot/draw/isosurface.m, scripts/plot/draw/line.m,
scripts/plot/draw/loglog.m, scripts/plot/draw/loglogerr.m,
scripts/plot/draw/mesh.m, scripts/plot/draw/meshc.m, scripts/plot/draw/meshz.m,
scripts/plot/draw/pareto.m,
scripts/plot/draw/patch.m, scripts/plot/draw/pcolor.m,
scripts/plot/draw/peaks.m, scripts/plot/draw/pie.m, scripts/plot/draw/pie3.m,
scripts/plot/draw/plot.m, scripts/plot/draw/plot3.m,
scripts/plot/draw/plotmatrix.m, scripts/plot/draw/plotyy.m,
scripts/plot/draw/polar.m, scripts/plot/draw/private/__add_datasource__.m,
scripts/plot/draw/private/__bar__.m, scripts/plot/draw/private/__contour__.m,
scripts/plot/draw/private/__errcomm__.m,
scripts/plot/draw/private/__errplot__.m,
scripts/plot/draw/private/__ezplot__.m,
scripts/plot/draw/private/__interp_cube__.m,
scripts/plot/draw/private/__line__.m,
scripts/plot/draw/private/__marching_cube__.m,
scripts/plot/draw/private/__patch__.m, scripts/plot/draw/private/__pie__.m,
scripts/plot/draw/private/__plt__.m, scripts/plot/draw/private/__quiver__.m,
scripts/plot/draw/private/__scatter__.m, scripts/plot/draw/private/__stem__.m,
scripts/plot/draw/quiver.m, scripts/plot/draw/quiver3.m,
scripts/plot/draw/rectangle.m, scripts/plot/draw/ribbon.m,
scripts/plot/draw/rose.m, scripts/plot/draw/scatter.m,
scripts/plot/draw/scatter3.m, scripts/plot/draw/semilogx.m,
scripts/plot/draw/semilogxerr.m, scripts/plot/draw/semilogy.m,
scripts/plot/draw/semilogyerr.m, scripts/plot/draw/shrinkfaces.m,
scripts/plot/draw/slice.m, scripts/plot/draw/sombrero.m,
scripts/plot/draw/sphere.m, scripts/plot/draw/stairs.m,
scripts/plot/draw/stem.m, scripts/plot/draw/stem3.m,
scripts/plot/draw/stemleaf.m, scripts/plot/draw/surf.m,
scripts/plot/draw/surface.m, scripts/plot/draw/surfc.m,
scripts/plot/draw/surfl.m, scripts/plot/draw/surfnorm.m,
scripts/plot/draw/tetramesh.m, scripts/plot/draw/trimesh.m,
scripts/plot/draw/triplot.m, scripts/plot/draw/trisurf.m,
scripts/plot/draw/waterfall.m: Moved from plot/ to subdir draw.
* scripts/plot/util/__actual_axis_position__.m,
scripts/plot/util/__default_plot_options__.m,
scripts/plot/util/__gnuplot_drawnow__.m,
scripts/plot/util/__next_line_color__.m,
scripts/plot/util/__next_line_style__.m,
scripts/plot/util/__plt_get_axis_arg__.m, scripts/plot/util/__pltopt__.m,
scripts/plot/util/allchild.m, scripts/plot/util/ancestor.m,
scripts/plot/util/axes.m, scripts/plot/util/cla.m, scripts/plot/util/clf.m,
scripts/plot/util/close.m, scripts/plot/util/closereq.m,
scripts/plot/util/colstyle.m, scripts/plot/util/copyobj.m,
scripts/plot/util/figure.m, scripts/plot/util/findall.m,
scripts/plot/util/findfigs.m, scripts/plot/util/findobj.m,
scripts/plot/util/gca.m, scripts/plot/util/gcbf.m, scripts/plot/util/gcbo.m,
scripts/plot/util/gcf.m, scripts/plot/util/gco.m, scripts/plot/util/ginput.m,
scripts/plot/util/gnuplot_binary.in, scripts/plot/util/graphics_toolkit.m,
scripts/plot/util/hdl2struct.m, scripts/plot/util/hggroup.m,
scripts/plot/util/hold.m, scripts/plot/util/isaxes.m,
scripts/plot/util/isfigure.m, scripts/plot/util/ishghandle.m,
scripts/plot/util/ishold.m, scripts/plot/util/isprop.m,
scripts/plot/util/linkprop.m, scripts/plot/util/meshgrid.m,
scripts/plot/util/ndgrid.m,
scripts/plot/util/newplot.m, scripts/plot/util/print.m,
scripts/plot/util/printd.m, scripts/plot/util/private/__add_default_menu__.m,
scripts/plot/util/private/__fltk_ginput__.m,
scripts/plot/util/private/__fltk_print__.m,
scripts/plot/util/private/__ghostscript__.m,
scripts/plot/util/private/__gnuplot_get_var__.m,
scripts/plot/util/private/__gnuplot_ginput__.m,
scripts/plot/util/private/__gnuplot_has_feature__.m,
scripts/plot/util/private/__gnuplot_has_terminal__.m,
scripts/plot/util/private/__gnuplot_open_stream__.m,
scripts/plot/util/private/__gnuplot_print__.m,
scripts/plot/util/private/__gnuplot_version__.m,
scripts/plot/util/private/__go_draw_axes__.m,
scripts/plot/util/private/__go_draw_figure__.m,
scripts/plot/util/private/__print_parse_opts__.m,
scripts/plot/util/private/__tight_eps_bbox__.m, scripts/plot/util/refresh.m,
scripts/plot/util/refreshdata.m, scripts/plot/util/saveas.m,
scripts/plot/util/shg.m, scripts/plot/util/struct2hdl.m,
scripts/plot/util/subplot.m: Moved from plot to subdir util.
* etc/HACKING: Updated directory structure info.
* scripts/Makefile.am, scripts/plot/appearance/module.mk,
scripts/plot/draw/module.mk, scripts/plot/util/module.mk:
Added new directories to build system.
author | Rik <rik@octave.org> |
---|---|
date | Fri, 04 Oct 2013 17:09:08 -0700 |
parents | scripts/plot/shrinkfaces.m@bc924baa2c4e |
children | d63878346099 |
line wrap: on
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/scripts/plot/draw/shrinkfaces.m Fri Oct 04 17:09:08 2013 -0700 @@ -0,0 +1,218 @@ +## 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) +