/usr/share/octave/packages/geometry-1.7.0/geom3d/drawSphericalEdge.m is in octave-geometry 1.7.0-1build1.
This file is owned by root:root, with mode 0o644.
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## 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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## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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## -*- texinfo -*-
## @deftypefn {Function File} drawSphericalEdge (@var{sphere}, @var{edge})
## Draw an edge on the surface of a sphere
##
## @var{edge} is given as a couple of 3D corodinates corresponding to edge
## extremities. The shortest spherical edge joining the two extremities is
## drawn on the current axes.
##
## @seealso{drawSphericalPolygon}
## @end deftypefn
function varargout = drawSphericalEdge(sphere, edge, varargin)
# extract data of the sphere
origin = sphere(:, 1:3);
# extremities of current edge
point1 = edge(1:3);
point2 = edge(4:6);
# compute plane containing current edge
plane = createPlane(origin, point1, point2);
# intersection of the plane with unit sphere
circle = intersectPlaneSphere(plane, sphere);
# find the position (in degrees) of the 2 vertices on the circle
angle1 = circle3dPosition(point1, circle);
angle2 = circle3dPosition(point2, circle);
# ensure angles are in right direction
if mod(angle2 - angle1 + 360, 360) > 180
tmp = angle1;
angle1 = angle2;
angle2 = tmp;
end
# compute angle extent of the circle arc
angleExtent = mod(angle2 - angle1 + 360, 360);
# create circle arc
arc = [circle angle1 angleExtent];
# draw the arc
h = drawCircleArc3d(arc, varargin{:});
if nargout > 0
varargout = {h};
end
endfunction
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