/usr/share/octave/packages/geometry-1.7.0/geom2d/createEdge.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 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 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | ## 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
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## 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{edge} = } createEdge (@var{p1}, @var{p2})
## @deftypefnx {Function File} {@var{edge} = } createEdge (@var{x0}, @var{y0}, @var{dx}, @var{dy})
## @deftypefnx {Function File} {@var{edge} = } createEdge (@var{param})
## @deftypefnx {Function File} {@var{edge} = } createEdge (@var{line}, @var{d})
## Create an edge between two points, or from a line.
##
## The internal format for edge representation is given by coordinates of
## two points : [x1 y1 x2 y2].
## This function can serve as a line to edge converter.
##
##
## Returns the edge between the two given points @var{p1} and @var{p2}.
##
## Returns the edge going through point (@var{x0}, @var{y0}) and with direction
## vector (@var{dx},@var{dy}).
##
## When @var{param} is an array of 4 values, creates the edge going through the
## point (param(1) param(2)), and with direction vector given by
## (param(3) param(4)).
##
## When @var{line} is given, creates the edge contained in @var{line}, with same
## direction and start point, but with length given by @var{d}.
##
##
## Note: in all cases, parameters can be vertical arrays of the same
## dimension. The result is then an array of edges, of dimensions [N*4].
##
## @seealso{edges2d, lines2d, drawEdge, clipEdge}
## @end deftypefn
function edge = createEdge(varargin)
if length(varargin)==1
# Only one input parameter. It can be :
# - line angle
# - array of four parameters
# TODO : add control for arrays of lines.
var = varargin{1};
if size(var, 2)==4
# 4 parameters of the line in a single array.
#edge = var;
edge = zeros(size(var));
edge(:, 1:2) = var(:,1:2);
edge(:, 3:4) = edge(:, 1:2)+var(:,3:4);
elseif size(var, 2)==1
# 1 parameter : angle of the line, going through origin.
edge = [zeros(size(var,1)) zeros(size(var,1)) cos(var) sin(var)];
else
error('wrong number of dimension for arg1 : can be 1 or 4');
end
elseif length(varargin)==2
# 2 input parameters. They can be :
# - 2 points, then 2 arrays of 1*2 double,
# - a line, and a distance.
v1 = varargin{1};
v2 = varargin{2};
if size(v1, 2)==2
# first input parameter is first point, and second input is the
# second point.
#edge = [v1(:,1), v1(:,2), v2(:,1), v2(:,2)];
edge = [v1 v2];
else
# first input parameter is a line, and second one a distance.
angle = atan2(v1(:,4), v1(:,3));
edge = [v1(:,1), v1(:,2), v1(:,1)+v2.*cos(angle), v1(:,2)+v2.*sin(angle)];
end
elseif length(varargin)==3
# 3 input parameters :
# first one is a point belonging to the line,
# second and third ones are direction vector of the line (dx and dy).
p = varargin{1};
edge = [p(:,1) p(:,2) p(:,1)+varargin{2} p(:,2)+varargin{3}];
elseif length(varargin)==4
# 4 input parameters :
# they are x0, y0 (point belonging to line) and dx, dy (direction
# vector of the line).
# All parameters should have the same size.
edge = [varargin{1} varargin{2} varargin{1}+varargin{3} varargin{2}+varargin{4}];
else
error('Wrong number of arguments in ''createLine'' ');
end
endfunction
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