1 %% Copyright (c) 2011, INRA
2 %% 2003-2011, David Legland <david.legland@grignon.inra.fr>
3 %% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
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35 %% @deftypefn {Function File} {@var{b} = } isPointOnLine (@var{point}, @var{line})
36 %% Test if a point belongs to a line
38 %% B = isPointOnLine(POINT, LINE)
39 %% with POINT being [xp yp], and LINE being [x0 y0 dx dy].
40 %% Returns 1 if point lies on the line, 0 otherwise.
42 %% If POINT is an N*2 array of points, B is a N*1 array of booleans.
44 %% If LINE is a N*4 array of line, B is a 1*N array of booleans.
46 %% @seealso {lines2d, points2d, isPointOnEdge, isPointOnRay, angle3Points}
49 function b = isPointOnLine(point, line, varargin)
51 % extract computation tolerance
57 % number of lines and of points
61 % adapt the size of inputs
62 x0 = repmat(line(:,1)', Np, 1);
63 y0 = repmat(line(:,2)', Np, 1);
64 dx = repmat(line(:,3)', Np, 1);
65 dy = repmat(line(:,4)', Np, 1);
66 xp = repmat(point(:,1), 1, Nl);
67 yp = repmat(point(:,2), 1, Nl);
69 % test if lines are colinear
70 b = abs((xp-x0).*dy-(yp-y0).*dx)./hypot(dx, dy) < tol;