/usr/share/octave/packages/geometry-1.7.0/geom2d/transformLine.m is in octave-geometry 1.7.0-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | ## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## All rights reserved.
##
## 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
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##
## 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 AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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## -*- texinfo -*-
## @deftypefn {Function File} {@var{line2} = } transformLine (@var{line1}, @var{T})
## Transform a line with an affine transform.
##
## Returns the line @var{line1} transformed with affine transform @var{T}.
## @var{line1} has the form [x0 y0 dx dy], and @var{T} is a transformation
## matrix.
##
## Format of @var{T} 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{line1} is a [Nx4] array of double. In this case, @var{line2}
## has the same size as @var{line1}.
##
## @seealso{lines2d, transforms2d, transformPoint}
## @end deftypefn
function dest = transformLine(line, trans)
# isolate points
points1 = line(:, 1:2);
points2 = line(:, 1:2) + line(:, 3:4);
# transform points
points1 = transformPoint(points1, trans);
points2 = transformPoint(points2, trans);
dest = createLine(points1, points2);
endfunction
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