/usr/share/octave/packages/geometry-1.7.0/geom2d/edgePosition.m is in octave-geometry 1.7.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | ## 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
## documentation and/or other materials provided with the distribution.
##
## 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
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{d} = } edgePosition (@var{point}, @var{edge})
## Return position of a point on an edge
##
## POS = edgePosition(POINT, EDGE);
## Computes position of point POINT on the edge EDGE, relative to the
## position of edge vertices.
## EDGE has the form [x1 y1 x2 y2],
## POINT has the form [x y], and is assumed to belong to edge.
## The position POS has meaning:
## POS<0: POINT is located before the first vertex
## POS=0: POINT is located on the first vertex
## 0<POS<1: POINT is located between the 2 vertices (on the edge)
## POS=1: POINT is located on the second vertex
## POS<0: POINT is located after the second vertex
##
## POS = edgePosition(POINT, EDGES);
## If EDGES is an array of NL edges, return NL positions, corresponding to
## each edge.
##
## POS = edgePosition(POINTS, EDGE);
## If POINTS is an array of NP points, return NP positions, corresponding
## to each point.
##
## POS = edgePosition(POINTS, EDGES);
## If POINTS is an array of NP points and edgeS is an array of NL edges,
## return an array of [NP NL] position, corresponding to each couple
## point-edge.
##
## @seealso{edges2d, createEdge, onEdge}
## @end deftypefn
function d = edgePosition(point, edge)
# number of points and of edges
Nl = size(edge, 1);
Np = size(point, 1);
if Np==Nl
dxl = edge(:, 3)-edge(:,1);
dyl = edge(:, 4)-edge(:,2);
dxp = point(:, 1) - edge(:, 1);
dyp = point(:, 2) - edge(:, 2);
d = (dxp.*dxl + dyp.*dyl)./(dxl.*dxl+dyl.*dyl);
else
# expand one of the array to have the same size
dxl = repmat((edge(:,3)-edge(:,1))', Np, 1);
dyl = repmat((edge(:,4)-edge(:,2))', Np, 1);
dxp = repmat(point(:,1), 1, Nl) - repmat(edge(:,1)', Np, 1);
dyp = repmat(point(:,2), 1, Nl) - repmat(edge(:,2)', Np, 1);
d = (dxp.*dxl + dyp.*dyl)./(dxl.*dxl+dyl.*dyl);
end
endfunction
|