/usr/share/octave/packages/geometry-1.7.0/geom2d/angle3Points.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{alpha} =} angle3Points (@var{p1}, @var{p2}, @var{p3})
## Computes the angle between the points @var{p1}, @var{p2} and @var{p3}.
##
## @var{p1}, @var{p2} and @var{p3} are either [1x2] arrays, or [Nx2] arrays, in this case
## @var{alpha} is a [Nx1] array. The angle computed is the directed angle between line
## (@var{p2}@var{p1}) and line (@var{p2}@var{p3}).
##
## Result is always given in radians, between 0 and 2*pi.
##
## @seealso{points2d, angles2d, angle2points}
## @end deftypefn
function theta = angle3Points(varargin)
if length(varargin)==3
p1 = varargin{1};
p2 = varargin{2};
p3 = varargin{3};
elseif length(varargin)==1
var = varargin{1};
p1 = var(1,:);
p2 = var(2,:);
p3 = var(3,:);
end
# angle line (P2 P1)
theta = lineAngle(createLine(p2, p1), createLine(p2, p3));
endfunction
%!test
%! # all points inside window, possibly touching edges
%! p1 = [10 0];
%! p2 = [0 0];
%! p3 = [0 10];
%! angle_ = angle3Points(p1, p2, p3);
%! assert(pi/2, angle_,1e-6);
%! angle_ = angle3Points([p1; p2; p3]);
%! assert(pi/2, angle_, 1e-6);
%!test
%! p1 = [10 0; 20 0];
%! p2 = [0 0;0 0];
%! p3 = [0 10; 0 20];
%! angle_ = angle3Points(p1, p2, p3);
%! assert(2, size(angle_, 1));
%! assert([pi/2;pi/2], angle_, 1e-6);
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