/usr/share/octave/packages/geometry-1.7.0/geom2d/parallelLine.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 | ## 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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## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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## -*- texinfo -*-
## @deftypefn {Function File} {@var{res} = } parallelLine (@var{line}, @var{point})
## @deftypefnx {Function File} {@var{res} = } parallelLine (@var{line}, @var{dist})
## Create a line parallel to another one.
##
## Returns the line with same direction vector than @var{line} and going through
## the point given by @var{point}.
## @var{line} is given as [x0 y0 dx dy] and @var{point} is [xp yp].
##
## Uses relative distance to specify position. The new line will be
## located at distance @var{dist}, counted positive in the right side of @var{line}
## and negative in the left side.
##
## @seealso{lines2d, orthogonalLine, distancePointLine}
## @end deftypefn
function res = parallelLine(line, point)
if size(point, 1)==1
# use a distance. Compute position of point located at distance DIST on
# the line orthogonal to the first one.
point = pointOnLine([line(:,1) line(:,2) line(:,4) -line(:,3)], point);
end
# normal case: compute line through a point with given direction
res = zeros(1, 4);
res(1:2) = point;
res(3:4) = line(3:4);
endfunction
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