X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fgeometry-1.5.0%2Fgeom2d%2FmedianLine.m;fp=octave_packages%2Fgeometry-1.5.0%2Fgeom2d%2FmedianLine.m;h=1f1409b744af05b5d363f2bf84034bb1fdd232c1;hp=0000000000000000000000000000000000000000;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/geometry-1.5.0/geom2d/medianLine.m b/octave_packages/geometry-1.5.0/geom2d/medianLine.m
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+%% Copyright (c) 2011, INRA
+%% 2003-2011, David Legland <david.legland@grignon.inra.fr>
+%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+%%
+%% All rights reserved.
+%% (simplified BSD License)
+%%
+%% Redistribution and use in source and binary forms, with or without
+%% modification, are permitted provided that the following conditions are met:
+%%
+%% 1. Redistributions of source code must retain the above copyright notice, this
+%%    list of conditions and the following disclaimer.
+%%
+%% 2. Redistributions in binary form must reproduce the above copyright notice,
+%%    this list of conditions and the following disclaimer in the documentation
+%%    and/or other materials provided with the distribution.
+%%
+%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+%% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+%% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+%% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+%% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+%% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+%% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+%% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+%% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+%% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+%% POSSIBILITY OF SUCH DAMAGE.
+%%
+%% The views and conclusions contained in the software and documentation are
+%% those of the authors and should not be interpreted as representing official
+%% policies, either expressed or implied, of copyright holder.
+
+%% -*- texinfo -*-
+%% @deftypefn {Function File} {@var{line} = } medianLine (@var{p1}, @var{p2})
+%% @deftypefnx {Function File} {@var{line} = } medianLine (@var{pts})
+%% @deftypefnx {Function File} {@var{line} = } medianLine (@var{edge})
+%% Create a median line between two points.
+%%
+%%   Create the median line of points @var{p1} and @var{p2}, that is the line containing
+%%   all points located at equal distance of @var{p1} and @var{p2}.
+%%
+%%   Creates the median line of 2 points, given as a 2*2 array @var{pts}. Array has
+%%   the form:
+%%   [ [ x1 y1 ] ; [ x2 y2 ] ]
+%%
+%%   Creates the median of the @var{edge}. @var{edge} is a 1*4 array, containing [X1 Y1]
+%%   coordinates of first point, and [X2 Y2], the coordinates of the second
+%%   point.
+%%
+%%   Example
+%%
+%%  @example
+%%   % Draw the median line of two points
+%%     P1 = [10 20];
+%%     P2 = [30 50];
+%%     med = medianLine(P1, P2);
+%%     figure; axis square; axis([0 100 0 100]);
+%%     drawEdge([P1 P2], 'linewidth', 2, 'color', 'k');
+%%     drawLine(med)
+%%
+%%   % Draw the median line of an edge
+%%     P1 = [50 60];
+%%     P2 = [80 30];
+%%     edge = createEdge(P1, P2);
+%%     figure; axis square; axis([0 100 0 100]);
+%%     drawEdge(edge, 'linewidth', 2)
+%%     med = medianLine(edge);
+%%     drawLine(med)
+%% @end example
+%%
+%%   @seealso{lines2d, createLine, orthogonalLine}
+%% @end deftypefn
+
+function lin = medianLine(varargin)
+
+  nargs = length(varargin);
+  x0 = 0;
+  y0 = 0;
+  dx = 0;
+  dy = 0;
+
+  if nargs == 1
+      tab = varargin{1};
+      if size(tab, 2)==2
+          % input is an array of two points
+          x0 = tab(1,1);
+          y0 = tab(1,2);
+          dx = tab(2,1)-x0;
+          dy = tab(2,2)-y0;
+      else
+          % input is an edge
+          x0 = tab(:, 1);
+          y0 = tab(:, 2);
+          dx = tab(:, 3) - tab(:, 1);
+          dy = tab(:, 4) - tab(:, 2);
+      end
+
+  elseif nargs==2
+      % input is given as two points, or two point arrays
+      p1 = varargin{1};
+      p2 = varargin{2};
+      x0 = p1(:, 1);
+      y0 = p1(:, 2);
+      dx = bsxfun(@minus, p2(:, 1), x0);
+      dy = bsxfun(@minus, p2(:, 2), y0);
+
+  else
+      error('Too many input arguments');
+  end
+
+  % compute median using middle point of the edge, and the direction vector
+  % rotated by 90 degrees counter-clockwise
+  lin = [bsxfun(@plus, x0, dx/2), bsxfun(@plus, y0, dy/2), -dy, dx];
+
+endfunction
+
+%!shared privpath
+%! privpath = [fileparts(which('geom2d_Contents')) filesep() 'private'];
+
+%!test
+%!  addpath (privpath,'-end')
+%!  p1 = [0 0];
+%!  p2 = [10 0];
+%!  exp = [5 0 0 10];
+%!  lin = medianLine(p1, p2);
+%!  assertElementsAlmostEqual(exp, lin);
+%!  rmpath (privpath);
+
+%!test
+%!  addpath (privpath,'-end')
+%!  p1 = [0 0];
+%!  p2 = [10 0];
+%!  exp = [5 0 0 10];
+%!  lin = medianLine([p1 p2]);
+%!  assertElementsAlmostEqual(exp, lin);
+%!  rmpath (privpath);
+
+%!test
+%!  addpath (privpath,'-end')
+%!  p1 = [0 0; 10 10];
+%!  p2 = [10 0;10 20];
+%!  exp = [5 0 0 10; 10 15 -10 0];
+%!  lin = medianLine(p1, p2);
+%!  assertElementsAlmostEqual(exp, lin);
+%!  rmpath (privpath);