1 %% Copyright (c) 2011, INRA
2 %% 2009-2011, David Legland <david.legland@grignon.inra.fr>
3 %% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
5 %% All rights reserved.
6 %% (simplified BSD License)
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35 %% @deftypefn {Function File} {@var{T} = } function_name (@var{line})
36 %% Create the the 3x3 matrix of a line reflection.
38 %% Where @var{line} is given as [x0 y0 dx dy], return the affine tansform
39 %% corresponding to the desired line reflection.
41 %% @seealso{lines2d, transforms2d, transformPoint,
42 %% createTranslation, createHomothecy, createScaling}
45 function trans = createLineReflection(line)
47 % extract line parameters
53 % normalisation coefficient of line direction vector
54 delta = dx*dx + dy*dy;
56 % compute coefficients of transform
57 m00 = (dx*dx - dy*dy)/delta;
59 m02 = 2*dy*(dy*x0 - dx*y0)/delta;
61 m11 = (dy*dy - dx*dx)/delta;
62 m12 = 2*dx*(dx*y0 - dy*x0)/delta;
64 % create transformation
65 trans = [m00 m01 m02; m10 m11 m12; 0 0 1];