--- /dev/null
+%% 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{pt2} = } transformPoint (@var{pt1}, @var{Trans})
+%% @deftypefnx {Function File} {[@var{px2} @var{py2}]= } transformPoint (@var{px1}, @var{py1}, @var{Trans})
+%% Transform a point with an affine transform.
+%%
+%% where @var{pt1} has the form [xp yp], and @var{Trans} is a [2x2], [2x3] or [3x3]
+%% matrix, returns the point transformed with affine transform @var{Trans}.
+%%
+%% Format of @var{Trans} can be one of :
+%% [a b] , [a b c] , or [a b c]
+%% [d e] [d e f] [d e f]
+%% [0 0 1]
+%%
+%% Also works when @var{pt1} is a [Nx2] array of double. In this case, @var{pt2} has
+%% the same size as @var{pt1}.
+%%
+%% Also works when @var{px1} and @var{py1} are arrays the same size. The function
+%% transform each couple of (@var{px1}, @var{py1}), and return the result in
+%% (@var{px2}, @var{py2}), which is the same size as (@var{px1} @var{py1}).
+%%
+%% @seealso{points2d, transforms2d, createTranslation, createRotation}
+%% @end deftypefn
+
+function varargout = transformPoint(varargin)
+
+ if length(varargin)==2
+ var = varargin{1};
+ px = var(:,1);
+ py = var(:,2);
+ trans = varargin{2};
+ elseif length(varargin)==3
+ px = varargin{1};
+ py = varargin{2};
+ trans = varargin{3};
+ else
+ error('wrong number of arguments in "transformPoint"');
+ end
+
+
+ % compute position
+ px2 = px*trans(1,1) + py*trans(1,2);
+ py2 = px*trans(2,1) + py*trans(2,2);
+
+ % add translation vector, if exist
+ if size(trans, 2)>2
+ px2 = px2 + trans(1,3);
+ py2 = py2 + trans(2,3);
+ end
+
+
+ if nargout==0 || nargout==1
+ varargout{1} = [px2 py2];
+ elseif nargout==2
+ varargout{1} = px2;
+ varargout{2} = py2;
+ end
+
+endfunction
+