1 // moon.hxx -- model earth's moon
3 // Written by Durk Talsma. Originally started October 1997, for distribution
4 // with the FlightGear project. Version 2 was written in August and
5 // September 1998. This code is based upon algorithms and data kindly
6 // provided by Mr. Paul Schlyter. (pausch@saaf.se).
8 // Separated out rendering pieces and converted to ssg by Curt Olson,
11 // This library is free software; you can redistribute it and/or
12 // modify it under the terms of the GNU Library General Public
13 // License as published by the Free Software Foundation; either
14 // version 2 of the License, or (at your option) any later version.
16 // This library is distributed in the hope that it will be useful,
17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 // Library General Public License for more details.
21 // You should have received a copy of the GNU Library General Public
22 // License along with this library; if not, write to the
23 // Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 // Boston, MA 02111-1307, USA.
35 #include <simgear/misc/sg_path.hxx>
40 ssgTransform *moon_transform;
41 ssgSimpleState *orb_state;
42 ssgSimpleState *halo_state;
46 ssgVertexArray *halo_vl;
47 ssgTexCoordArray *halo_tl;
57 // build the moon object
58 ssgBranch *build( SGPath path, double moon_size );
60 // repaint the moon colors based on current value of moon_anglein
61 // degrees relative to verticle
62 // 0 degrees = high noon
63 // 90 degrees = moon rise/set
64 // 180 degrees = darkest midnight
65 bool repaint( double moon_angle );
67 // reposition the moon at the specified right ascension and
68 // declination, offset by our current position (p) so that it
69 // appears fixed at a great distance from the viewer. Also add in
70 // an optional rotation (i.e. for the current time of day.)
71 bool reposition( sgVec3 p, double angle,
72 double rightAscension, double declination,
77 #endif // _SG_MOON_HXX_