1 // oursun.hxx -- model earth's sun
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.
33 #include <osg/MatrixTransform>
35 #include <simgear/structure/SGReferenced.hxx>
37 #include <simgear/misc/sg_path.hxx>
38 #include <simgear/props/props.hxx>
40 class SGSun : public SGReferenced {
42 osg::ref_ptr<osg::MatrixTransform> sun_transform;
44 osg::ref_ptr<osg::Vec4Array> sun_cl;
45 osg::ref_ptr<osg::Vec4Array> scene_cl;
46 osg::ref_ptr<osg::Vec4Array> ihalo_cl;
47 osg::ref_ptr<osg::Vec4Array> ohalo_cl;
50 double prev_sun_angle;
51 // distance of light traveling through the atmosphere
53 double sun_exp2_punch_through;
55 SGPropertyNode_ptr env_node;
65 // return the sun object
66 osg::Node* build( SGPath path, double sun_size, SGPropertyNode *property_tree_Node );
68 // repaint the sun colors based on current value of sun_anglein
69 // degrees relative to verticle
70 // 0 degrees = high noon
71 // 90 degrees = sun rise/set
72 // 180 degrees = darkest midnight
73 bool repaint( double sun_angle, double new_visibility );
75 // reposition the sun at the specified right ascension and
76 // declination, offset by our current position (p) so that it
77 // appears fixed at a great distance from the viewer. Also add in
78 // an optional rotation (i.e. for the current time of day.)
79 bool reposition( double rightAscension, double declination,
80 double sun_dist, double lat, double alt_asl, double sun_angle );
82 // retrun the current color of the sun
84 SGVec4f get_scene_color();
88 #endif // _SG_SUN_HXX_