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## Copyright (C) 2024 David Legland
## 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.
##
## 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 the copyright holders.
function index = findPoint(coord, points, varargin)
%FINDPOINT Find index of a point in an set from its coordinates.
%
% IND = findPoint(POINT, ARRAY)
% Returns the index of point whose coordinates match the 1-by-2 row array
% POINT in the N-by-2 array ARRAY. If the point is not found, returns 0.
% If several points are found, keep only the first one.
%
% If POINT is a M-by-2 array, the result is a M-by-1 array, containing
% the index in the array of each point given by COORD, or 0 if the point
% is not found.
%
% IND = findPoint(POINT, ARRAY, TOL)
% use specified tolerance, to find point within a distance of TOL.
% Default tolerance is zero.
%
% See also
% points2d, minDistancePoints, distancePoints, findClosestPoint
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2003-07-17
% Copyright 2003-2023 INRA - TPV URPOI - BIA IMASTE
% number of points
np = size(coord, 1);
% allocate memory for result
index = zeros(np, 1);
% specify the tolerance
tol = 0;
if ~isempty(varargin)
tol = varargin{1};
end
if tol == 0
for i = 1:np
% indices of matches
ind = find(points(:,1) == coord(i,1) & points(:,2) == coord(i,2));
% format current result
if isempty(ind)
index(i) = 0;
else
index(i) = ind(1);
end
end
else
for i = 1:np
% indices of matches
ind = find(sqrt(sum(bsxfun(@minus, points, coord) .^ 2, 2)) <= tol);
% format current result
if isempty(ind)
index(i) = 0;
else
index(i) = ind(1);
end
end
end
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