/usr/share/octave/packages/geometry-1.7.0/geom2d/isPointOnLine.m is in octave-geometry 1.7.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | ## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## All rights reserved.
##
## 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 AUTHOR 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.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{b} = } isPointOnLine (@var{point}, @var{line})
## Test if a point belongs to a line
##
## B = isPointOnLine(POINT, LINE)
## with POINT being [xp yp], and LINE being [x0 y0 dx dy].
## Returns 1 if point lies on the line, 0 otherwise.
##
## If POINT is an N*2 array of points, B is a N*1 array of booleans.
##
## If LINE is a N*4 array of line, B is a 1*N array of booleans.
##
## @seealso {lines2d, points2d, isPointOnEdge, isPointOnRay, angle3Points}
## @end deftypefn
function b = isPointOnLine(point, line, varargin)
# extract computation tolerance
tol = 1e-14;
if ~isempty(varargin)
tol = varargin{1};
end
# number of lines and of points
Nl = size(line, 1);
Np = size(point, 1);
# adapt the size of inputs
x0 = repmat(line(:,1)', Np, 1);
y0 = repmat(line(:,2)', Np, 1);
dx = repmat(line(:,3)', Np, 1);
dy = repmat(line(:,4)', Np, 1);
xp = repmat(point(:,1), 1, Nl);
yp = repmat(point(:,2), 1, Nl);
# test if lines are colinear
b = abs((xp-x0).*dy-(yp-y0).*dx)./hypot(dx, dy) < tol;
endfunction
|