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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 = drawGraphEdges(varargin)
%DRAWGRAPHEDGES Draw edges of a graph.
%
% drawGraphEdges(NODES, EDGES)
% Draws a graph specified by a set of nodes (array N-by-2 or N-by-3,
% corresponding to coordinate of each node), and a set of edges (an array
% Ne-by-2, containing to the first and the second node of each edge).
%
% drawGraphEdges(..., SEDGES)
% Specifies the draw mode for each element, as in the classical 'plot'
% function.
% Default drawing is a blue line for edges.
%
%
% H = drawGraphEdges(...)
% Returns handle to the set of edges.
%
% See also
% graphs, drawGraph, fillGraphFaces
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2005-11-24
% Copyright 2005-2023 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
%% Input argument processing
% initialisations
e = [];
% check input arguments number
if nargin == 0
help drawGraphEdges;
return;
end
% extract handle of axis to draw on
if isAxisHandle(varargin{1})
ax = varargin{1};
varargin(1) = [];
else
ax = gca;
end
% First extract the graph structure
var = varargin{1};
if iscell(var)
% TODO: should consider array of graph structures.
% graph is stored as a cell array: first cell is nodes, second one is
% edges, and third one is faces
n = var{1};
if length(var) > 1
e = var{2};
end
varargin(1) = [];
elseif isstruct(var)
% graph is stored as a structure, with fields 'nodes', 'edges'
n = var.nodes;
e = var.edges;
varargin(1) = [];
else
% graph is stored as set of variables: nodes + edges
n = varargin{1};
e = varargin{2};
varargin(1:2) = [];
end
% check if there are edges to draw
if size(e, 1) == 0
return;
end
% setup default drawing style if not specified
if isempty(varargin)
varargin = {'-b'};
end
%% main drawing processing
if size(n, 2) == 2
% Draw 2D edges
x = [n(e(:,1), 1) n(e(:,2), 1)]';
y = [n(e(:,1), 2) n(e(:,2), 2)]';
he = plot(ax, x, y, varargin{:});
elseif size(n, 2) == 3
% Draw 3D edges
x = [n(e(:,1), 1) n(e(:,2), 1)]';
y = [n(e(:,1), 2) n(e(:,2), 2)]';
z = [n(e(:,1), 3) n(e(:,2), 3)]';
he = plot3(ax, x, y, z, varargin{:});
end
%% format output arguments
if nargout == 1
varargout = {he};
end
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