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