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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 edges = polygonEdges(poly)
%POLYGONEDGES Return the edges of a simple or multiple polygon.
%
% EDGES = polygonEdges(POLY)
% Return the set of edges of the polygon specified by POLY. POLY may be
% either a simple polygon given as a N-by-2 array of vertices, or a
% multiple polygon given by a cell array of linear rings, each ring being
% given as N-by-2 array of vertices.
%
%
% Example
% poly = [50 10;60 10;60 20;50 20];
% polygonEdges(poly)
% ans =
% 50 10 60 10
% 60 10 60 20
% 60 20 50 20
% 50 20 50 10
%
% See also
% polygons2d, polygonVertices
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2017-08-29, using Matlab 9.1.0.441655 (R2016b)
% Copyright 2017-2023 INRA - Cepia Software Platform
% test presence of NaN values
if isnumeric(poly) && any(isnan(poly(:)))
poly = splitPolygons(poly);
end
% create the array of polygon edges
if iscell(poly)
% process multiple polygons
edges = zeros(0, 4);
for i = 1:length(poly)
pol = poly{i};
N = size(pol, 1);
edges = [edges; pol(1:N, :) pol([2:N 1], :)]; %#ok<AGROW>
end
else
% get edges of a simple polygon
N = size(poly, 1);
edges = [poly(1:N, :) poly([2:N 1], :)];
end
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