Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / geometry-1.5.0 / geom2d / isLeftOriented.m

diff --git a/octave_packages/geometry-1.5.0/geom2d/isLeftOriented.m b/octave_packages/geometry-1.5.0/geom2d/isLeftOriented.m
new file mode 100644 (file)
index 0000000..a95e1a1
--- /dev/null
+++ b/octave_packages/geometry-1.5.0/geom2d/isLeftOriented.m
@@ -0,0 +1,59 @@
+%% Copyright (c) 2011, INRA
+%% 2005-2011, David Legland <david.legland@grignon.inra.fr>
+%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
+%%
+%% All rights reserved.
+%% (simplified BSD License)
+%%
+%% 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 COPYRIGHT HOLDER 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 copyright holder.
+
+%% -*- texinfo -*-
+%% @deftypefn {Function File} {@var{b} = } isLeftOriented (@var{point}, @var{line})
+%% Test if a point is on the left side of a line
+%%
+%%   B = isLeftOriented(POINT, LINE);
+%%   Returns TRUE if the point lies on the left side of the line with
+%%   respect to the line direction.
+%%
+%%   @seealso{lines2d, points2d, isCounterClockwise, isPointOnLine, distancePointLine}
+%% @end deftypefn
+
+function b = isLeftOriented(point, line)
+  Nl = size(line, 1);
+  Np = size(point, 1);
+
+  x0 = repmat(line(:,1)', Np, 1);
+  y0 = repmat(line(:,2)', Np, 1);
+  dx = repmat(line(:,3)', Np, 1);
+  dy = repmat(line(:,4)', Np, 1);
+  xp = repmat(point(:,1), 1, Nl);
+  yp = repmat(point(:,2), 1, Nl);
+
+
+  b = (xp-x0).*dy-(yp-y0).*dx < 0;
+
+endfunction