/usr/share/octave/packages/geometry-1.7.0/geom2d/lineAngle.m is in octave-geometry 1.7.0-1build1.
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## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## 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
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## -*- texinfo -*-
## @deftypefn {Function File} {@var{theta} =} lineAngle(varargin)
## Computes angle between two straight lines
##
## A = lineAngle(LINE);
## Returns the angle between horizontal, right-axis and the given line.
## Angle is fiven 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.
##
## @seealso{lines2d, angles2d, createLine, normalizeAngle}
## @end deftypefn
function theta = lineAngle(varargin)
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
endfunction
# horizontal
%!test
%! line1 = createLine([2 3 1 0]);
%! assert (lineAngle(line1), 0, 1e-6);
%!test
%! line1 = createLine([2 3 0 1]);
%! assert (lineAngle(line1), pi/2, 1e-6);
%!test
%! line1 = createLine([2 3 1 1]);
%! assert (lineAngle(line1), pi/4, 1e-6);
%!test
%! line1 = createLine([2 3 5 -1]);
%! assert (lineAngle(line1), mod(atan2(-1, 5)+2*pi, 2*pi), 1e-6);
%!test
%! line1 = createLine([2 3 5000 -1000]);
%! assert (lineAngle(line1), mod(atan2(-1, 5)+2*pi, 2*pi), 1e-6);
%!test
%! line1 = createLine([2 3 -1 0]);
%! assert (lineAngle(line1), pi, 1e-6);
# test lineAngle with two parameters : angle between 2 lines
# check for 2 orthogonal lines
%!test
%! line1 = createLine([1 3 1 0]);
%! line2 = createLine([-2 -1 0 1]);
%! assert (lineAngle(line1, line2), pi/2, 1e-6);
%! assert (lineAngle(line2, line1), 3*pi/2, 1e-6);
# check for 2 orthogonal lines, with very different parametrizations
%!test
%! line1 = createLine([1 3 1 1]);
%! line2 = createLine([-2 -1 -1000 1000]);
%! assert (lineAngle(line1, line2), pi/2, 1e-6);
%! assert (lineAngle(line2, line1), 3*pi/2, 1e-6);
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