1 %% Copyright (c) 2011, INRA
2 %% 2004-2011, David Legland <david.legland@grignon.inra.fr>
3 %% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
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35 %% @deftypefn {Function File} {@var{edge2} = } transformEdge (@var{edge1}, @var{T})
36 %% Transform an edge with an affine transform.
38 %% Where @var{edge1} has the form [x1 y1 x2 y1], and @var{T} is a transformation
39 %% matrix, return the edge transformed with affine transform @var{T}.
41 %% Format of TRANS can be one of :
42 %% [a b] , [a b c] , or [a b c]
43 %% [d e] [d e f] [d e f]
46 %% Also works when @var{edge1} is a [Nx4] array of double. In this case, @var{edge2}
47 %% has the same size as @var{edge1}.
49 %% @seealso{edges2d, transforms2d, transformPoint, translation, rotation}
52 function dest = transformEdge(edge, trans)
54 dest = zeros(size(edge));
57 dest(:,1) = edge(:,1)*trans(1,1) + edge(:,2)*trans(1,2);
58 dest(:,2) = edge(:,1)*trans(2,1) + edge(:,2)*trans(2,2);
59 dest(:,3) = edge(:,3)*trans(1,1) + edge(:,3)*trans(1,2);
60 dest(:,4) = edge(:,4)*trans(2,1) + edge(:,4)*trans(2,2);
62 % add translation vector, if exist
64 dest(:,1) = dest(:,1)+trans(1,3);
65 dest(:,2) = dest(:,2)+trans(2,3);
66 dest(:,3) = dest(:,3)+trans(1,3);
67 dest(:,4) = dest(:,4)+trans(2,3);