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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 pts2 = grFaceToPolygon(varargin)
%GRFACETOPOLYGON Compute the polygon corresponding to a graph face.
%
% PTS2 = grFaceToPolygon(NODES, EDGES, FACES, INDF)
% PTS2 = grFaceToPolygon(NODES, FACES, INDF)
% Where NODES, EDGES, and FACES are internal data of graph, and INDF is
% the index of the face to extract. The result is the (ordered) set of
% points composing the face.
%
%
% PTS2 = grFaceToPolygon(GRAPH, INDF)
% use structure representation for graph. The structure GRAPH must
% contain data for fields 'nodes' and 'faces'.
%
% If several indices face indices are specified, result is a cell array
% of polygons.
%
% The number of columns of PTS2 is the same as for NODES.
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2005-11-30
% Copyright 2005-2023 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
if length(varargin)==2
% argument is a graph structure
graph = varargin{1};
nodes = graph.nodes;
faces = graph.faces;
indf = varargin{2};
elseif length(varargin)==3
% arguments are nodes, faces and indices
nodes = varargin{1};
faces = varargin{2};
indf = varargin{3};
elseif length(varargin)==4
% arguments are nodes, edges, faces and indices, we forget edges
nodes = varargin{1};
faces = varargin{3};
indf = varargin{4};
end
if iscell(faces)
% faces is a cell array
if length(indf)==1
face = faces{indf};
pts2 = nodes(face, :);
else
pts2 = cell(length(indf), 1);
for i=1:length(indf)
face = faces{indf(i)};
pts2{i} = nodes(face, :);
end
end
else
% faces is an indices array: all faces have same number of vertices
if length(indf)==1
face = faces(indf, :);
pts2 = nodes(face, :);
else
pts2 = cell(length(indf), 1);
for i=1:length(indf)
face = faces(indf(i), :);
pts2{i} = nodes(face, :);
end
end
end
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