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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 polygons = splitPolygons(polygon)
%SPLITPOLYGONS Convert a NaN separated polygon list to a cell array of polygons.
%
% POLYGONS = splitPolygons(POLYGON);
% POLYGON is a N-by-2 array of points, possibly with pairs of NaN values.
% The functions separates each component separated by NaN values, and
% returns a cell array of polygons.
%
% See also
% polygons2d
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2007-10-12, using Matlab 7.4.0.287 (R2007a)
% Copyright 2007-2023 INRA - BIA PV Nantes - MIAJ Jouy-en-Josas
if iscell(polygon)
% case of a cell array
polygons = polygon;
elseif sum(isnan(polygon(:))) == 0
% single polygon -> no break
polygons = {polygon};
else
% find indices of NaN couples
inds = find(sum(isnan(polygon), 2) > 0);
% number of polygons
N = length(inds) + 1;
polygons = cell(N, 1);
% iterate over NaN-separated regions to create new polygon
inds = [0; inds; size(polygon, 1)+1];
for i = 1:N
polygons{i} = polygon((inds(i)+1):(inds(i+1)-1), :);
end
end
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