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 General Public License
22 // along with this program; if not, write to the Free Software
23 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
32 #include <osg/ref_ptr>
33 #include <osg/MatrixTransform>
34 #include <osg/Material>
36 #include <simgear/math/SGMath.hxx>
37 #include <simgear/structure/SGReferenced.hxx>
39 #include <simgear/misc/sg_path.hxx>
42 class SGMoon : public SGReferenced {
44 osg::ref_ptr<osg::MatrixTransform> moon_transform;
45 osg::ref_ptr<osg::Material> orb_material;
47 double prev_moon_angle;
57 // build the moon object
58 osg::Node *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( double rightAscension, double declination,
76 #endif // _SG_MOON_HXX_