Add a useful package (from Source forge) for octave

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

diff --git a/octave_packages/geometry-1.5.0/geom2d/transformPoint.m b/octave_packages/geometry-1.5.0/geom2d/transformPoint.m
new file mode 100644 (file)
index 0000000..5038fc3
--- /dev/null
+++ b/octave_packages/geometry-1.5.0/geom2d/transformPoint.m
@@ -0,0 +1,92 @@
+%% 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
+