1 %% Copyright (c) 2011, INRA
2 %% 2004-2011, David Legland <david.legland@grignon.inra.fr>
3 %% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
5 %% All rights reserved.
6 %% (simplified BSD License)
8 %% Redistribution and use in source and binary forms, with or without
9 %% modification, are permitted provided that the following conditions are met:
11 %% 1. Redistributions of source code must retain the above copyright notice, this
12 %% list of conditions and the following disclaimer.
14 %% 2. Redistributions in binary form must reproduce the above copyright notice,
15 %% this list of conditions and the following disclaimer in the documentation
16 %% and/or other materials provided with the distribution.
18 %% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 %% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 %% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 %% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 %% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 %% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 %% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 %% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 %% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 %% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 %% POSSIBILITY OF SUCH DAMAGE.
30 %% The views and conclusions contained in the software and documentation are
31 %% those of the authors and should not be interpreted as representing official
32 %% policies, either expressed or implied, of copyright holder.
35 %% @deftypefn {Function File} {@var{dist} = } distancePointLine (@var{point}, @var{line})
36 %% Minimum distance between a point and a line
38 %% D = distancePointLine(POINT, LINE)
39 %% Return the euclidean distance between line LINE and point POINT.
41 %% LINE has the form : [x0 y0 dx dy], and POINT is [x y].
43 %% If LINE is N-by-4 array, result is N-by-1 array computes for each line.
45 %% If POINT is N-by-2, then result is computed for each point.
47 %% If both POINT and LINE are array, result is N-by-1, computed for each
48 %% corresponding point and line.
51 %% @seealso{lines2d, points2d, distancePoints, distancePointEdge}
54 function dist = distancePointLine(point, line)
56 if size(line, 1)==1 && size(point, 1)>1
57 line = repmat(line, [size(point, 1) 1]);
60 if size(point, 1)==1 && size(line, 1)>1
61 point = repmat(point, [size(line, 1) 1]);
67 % compute position of points projected on line
68 tp = ((point(:, 2) - line(:, 2)).*dy + (point(:, 1) - line(:, 1)).*dx) ./ (dx.*dx+dy.*dy);
69 p0 = line(:, 1:2) + [tp tp].*[dx dy];
72 % compute distances between points and their projections
74 dist = sqrt(sum(dx.*dx, 2));