/usr/include/simgear/scene/sky/oursun.hxx is in libsimgear-dev 3.4.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | // oursun.hxx -- model earth's sun
//
// Written by Durk Talsma. Originally started October 1997, for distribution
// with the FlightGear project. Version 2 was written in August and
// September 1998. This code is based upon algorithms and data kindly
// provided by Mr. Paul Schlyter. (pausch@saaf.se).
//
// Separated out rendering pieces and converted to ssg by Curt Olson,
// March 2000
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifndef _SG_SUN_HXX_
#define _SG_SUN_HXX_
#include <osg/Array>
#include <osg/Node>
#include <osg/MatrixTransform>
#include <simgear/structure/SGReferenced.hxx>
#include <simgear/misc/sg_path.hxx>
#include <simgear/props/props.hxx>
class SGSun : public SGReferenced {
osg::ref_ptr<osg::MatrixTransform> sun_transform;
osg::ref_ptr<osg::Vec4Array> sun_cl;
osg::ref_ptr<osg::Vec4Array> scene_cl;
osg::ref_ptr<osg::Vec4Array> ihalo_cl;
osg::ref_ptr<osg::Vec4Array> ohalo_cl;
double visibility;
double prev_sun_angle;
// distance of light traveling through the atmosphere
double path_distance;
double sun_exp2_punch_through;
double horizon_angle;
SGPropertyNode_ptr env_node;
public:
// Constructor
SGSun( void );
// Destructor
~SGSun( void );
// return the sun object
osg::Node* build( SGPath path, double sun_size, SGPropertyNode *property_tree_Node );
// repaint the sun colors based on current value of sun_anglein
// degrees relative to verticle
// 0 degrees = high noon
// 90 degrees = sun rise/set
// 180 degrees = darkest midnight
bool repaint( double sun_angle, double new_visibility );
// reposition the sun at the specified right ascension and
// declination, offset by our current position (p) so that it
// appears fixed at a great distance from the viewer. Also add in
// an optional rotation (i.e. for the current time of day.)
bool reposition( double rightAscension, double declination,
double sun_dist, double lat, double alt_asl, double sun_angle );
// retrun the current color of the sun
SGVec4f get_color();
SGVec4f get_scene_color();
};
#endif // _SG_SUN_HXX_
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