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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 = drawDirectedEdges(nodes, edges, varargin)
%DRAWDIRECTEDEDGES Draw edges with arrow indicating direction.
%
% usage:
% drawDirectedEdges(NODES, EDGES);
% Draw edges joining nodes at position NODES, using a small arrow mark to
% depict the direction of the edges?
%
%
% drawDirectedEdges(NODES, EDGES, DIRECT)
% Also specifies the base direction of all edges. DIRECT is true by
% default. If DIRECT is false all edges are inverted.
%
% H = drawDirectedEdges(NODES, EDGES)
% Returns handles to each of the lines created.
%
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2003-03-12
% Copyright 2003-2023 INRA - TPV URPOI - BIA IMASTE
% determinate direction of arrows
direct = true;
if ~isempty(varargin)
direct = varargin{1};
end
% prepare display
hold on;
% iterate on edges to draw
h = zeros(length(edges),1);
for ie = 1:length(edges)
p1 = edges(ie, 1);
p2 = edges(ie, 2);
h(ie*4) = line([nodes(p1,1) nodes(p2,1)], [nodes(p1,2) nodes(p2,2)]);
% position of middles of edge
xm = (nodes(p1,1) + nodes(p2,1))/2;
ym = (nodes(p1,2) + nodes(p2,2))/2;
% orientation of edge
theta = atan2(nodes(p2,2) - nodes(p1,2), nodes(p2,1) - nodes(p1,1)) + (direct==0)*pi;
% pin of the arrow
xa0 = xm + 10*cos(theta);
ya0 = ym + 10*sin(theta);
% right side of the arrow
xa1 = xm + 3*cos(theta-pi/2);
ya1 = ym + 3*sin(theta-pi/2);
% left side of the arrow
xa2 = xm + 3*cos(theta+pi/2);
ya2 = ym + 3*sin(theta+pi/2);
h(ie*4+1) = line([xa1 xa0], [ya1 ya0]);
h(ie*4+2) = line([xa2 xa0], [ya2 ya0]);
end
if nargout == 1
varargout(1) = {h};
end
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