1 %% Copyright (c) 2011, INRA
2 %% 2003-2011, 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{res} = } parallelLine (@var{line}, @var{point})
36 %% @deftypefnx {Function File} {@var{res} = } parallelLine (@var{line}, @var{dist})
37 %% Create a line parallel to another one.
39 %% Returns the line with same direction vector than @var{line} and going through
40 %% the point given by @var{point}.
41 %% @var{line} is given as [x0 y0 dx dy] and @var{point} is [xp yp].
43 %% Uses relative distance to specify position. The new line will be
44 %% located at distance @var{dist}, counted positive in the right side of @var{line}
45 %% and negative in the left side.
47 %% @seealso{lines2d, orthogonalLine, distancePointLine}
50 function res = parallelLine(line, point)
53 % use a distance. Compute position of point located at distance DIST on
54 % the line orthogonal to the first one.
55 point = pointOnLine([line(:,1) line(:,2) line(:,4) -line(:,3)], point);
58 % normal case: compute line through a point with given direction