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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 len = edgeLength(varargin)
%EDGELENGTH Return length of an edge.
%
% L = edgeLength(EDGE);
% Returns the length of an edge, with parametric representation:
% [x1 y1 x2 y2].
%
% The function also works for several edges, in this case input is a
% N-by-4 array, containing parametric representation of each edge, and
% output is a N-by-1 array containing length of each edge.
%
% See also
% edges2d, edgeAngle
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2004-02-19
% Copyright 2004-2023 INRA - TPV URPOI - BIA IMASTE
if nargin == 1
% input is an edge [X1 Y1 X2 Y2]
edge = varargin{1};
len = hypot(edge(:,3)-edge(:,1), edge(:,4)-edge(:,2));
elseif nargin == 2
% input are two points [X1 Y1] and [X2 Y2]
p1 = varargin{1};
p2 = varargin{2};
len = hypot(p2(:,1)-p1(:,1), p2(:,2)-p1(:,2));
end
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