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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 varargout = grMergeMultipleNodes(varargin)
%GRMERGEMULTIPLENODES Simplify a graph by merging multiple nodes.
%
% OUTPUT = grMergeMultipleNodes(INPUT);
% simplify the graph INPUT, and return the result in the graph OUTPUT.
% format for input can be one of
% nodes, edges
%
% Two steps in the procedure :
% * first remove multiple nodes. find all nodes with same coords, and
% keep only one
% * remove edges that link same nodes
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2004-08-09
% Copyright 2004-2023 INRA - TPV URPOI - BIA IMASTE
%% process input arguments
n = [];
e = [];
f = [];
% extract data of the graph
var = varargin{1};
if iscell(var)
% graph is stored as a cell array : first cell is nodes, second one is
% edges, and third is faces
n = var{1};
if length(var)>1
e = var{2};
end
if length(var)>2
f = var{3};
end
elseif isstruct(var)
% graph is stored as a structure, with fields 'nodes', 'edges', and
% eventually 'faces'.
n = var.nodes;
e = var.edges;
if isfield(var, 'faces')
f = var.faces;
end
elseif length(varargin)>1
% graph is stored as set of variables : nodes, edges, and eventually
% faces
n = varargin{1};
e = varargin{2};
if length(varargin)==3
f = varargin{3};
end
end
%% Main processing
% simplify graph to remove multiple nodes, and adapt edges and faces
% indices
% simplify nodes
[n, i, j] = unique(n, 'rows'); %#ok<ASGLU>
% change edges indices and remove double edges (undirected graph)
for i = 1:length(e(:))
e(i) = j(e(i)); %#ok<AGROW>
end
e = unique(sort(e, 2), 'rows');
% change faces indices
if iscell(f)
% faces stored as cell array (irregular mesh)
for k = 1:length(f)
face = f{k};
for i = 1:length(face(:))
face(i) = j(face(i));
end
f{k} = face; %#ok<AGROW>
end
else
% faces indices stored as regular array (square or triangle mesh).
for i = 1:length(f(:))
f(i) = j(f(i)); %#ok<AGROW>
end
end
%% process output depending on how many arguments are needed
if nargout == 1
out{1} = n;
out{2} = e;
varargout{1} = out;
end
if nargout == 2
varargout{1} = n;
varargout{2} = e;
end
if nargout == 3
varargout{1} = n;
varargout{2} = e;
varargout{3} = f;
end
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