Add a useful package (from Source forge) for octave

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

diff --git a/octave_packages/geometry-1.5.0/geom2d/transformEdge.m b/octave_packages/geometry-1.5.0/geom2d/transformEdge.m
new file mode 100644 (file)
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+++ b/octave_packages/geometry-1.5.0/geom2d/transformEdge.m
@@ -0,0 +1,71 @@
+%% Copyright (c) 2011, INRA
+%% 2004-2011, 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{edge2} = } transformEdge (@var{edge1}, @var{T})
+%% Transform an edge with an affine transform.
+%%
+%%   Where @var{edge1} has the form [x1 y1 x2 y1], and @var{T} is a transformation
+%%   matrix, return the edge transformed with affine transform @var{T}. 
+%%
+%%   Format of 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{edge1} is a [Nx4] array of double. In this case, @var{edge2}
+%%   has the same size as @var{edge1}. 
+%%
+%%   @seealso{edges2d, transforms2d, transformPoint, translation, rotation}
+%% @end deftypefn
+
+function dest = transformEdge(edge, trans)
+
+  dest = zeros(size(edge));
+
+  % compute position
+  dest(:,1) = edge(:,1)*trans(1,1) + edge(:,2)*trans(1,2);
+  dest(:,2) = edge(:,1)*trans(2,1) + edge(:,2)*trans(2,2);
+  dest(:,3) = edge(:,3)*trans(1,1) + edge(:,3)*trans(1,2);
+  dest(:,4) = edge(:,4)*trans(2,1) + edge(:,4)*trans(2,2);
+
+  % add translation vector, if exist
+  if size(trans, 2)>2
+      dest(:,1) = dest(:,1)+trans(1,3);
+      dest(:,2) = dest(:,2)+trans(2,3);
+      dest(:,3) = dest(:,3)+trans(1,3);
+      dest(:,4) = dest(:,4)+trans(2,3);
+  end
+
+endfunction
+