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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 theta = lineAngle(varargin)
%LINEANGLE Computes angle between two straight lines.
%
% A = lineAngle(LINE);
% Returns the angle between horizontal, right-axis and the given line.
% Angle is given in radians, between 0 and 2*pi, in counter-clockwise
% direction.
%
% A = lineAngle(LINE1, LINE2);
% Returns the directed angle between the two lines. Angle is given in
% radians between 0 and 2*pi, in counter-clockwise direction.
%
% See also
% lines2d, angles2d, createLine, normalizeAngle
% ------
% Author: David Legland
% E-mail: david.legland@inrae.fr
% Created: 2003-10-31
% Copyright 2003-2023 INRA - TPV URPOI - BIA IMASTE
nargs = length(varargin);
if nargs == 1
% angle of one line with horizontal
line = varargin{1};
theta = mod(atan2(line(:,4), line(:,3)) + 2*pi, 2*pi);
elseif nargs==2
% angle between two lines
theta1 = lineAngle(varargin{1});
theta2 = lineAngle(varargin{2});
theta = mod(bsxfun(@minus, theta2, theta1)+2*pi, 2*pi);
end
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