92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
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// viewer_lookat.hxx -- class for managing a "look at" viewer in
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// the flightgear world.
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//
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// Written by Curtis Olson, started October 2000.
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//
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// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// 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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// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#ifndef _VIEWER_LOOKAT_HXX
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#define _VIEWER_LOOKAT_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include "viewer.hxx"
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// Define a structure containing view information
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class FGViewerLookAt: public FGViewer {
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private:
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// up vector for the view (usually point straight up through the
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// top of the aircraft
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sgVec3 view_up;
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// the vector pointing straight out the nose of the aircraft
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sgVec3 view_forward;
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// Transformation matrix for the view direction offset relative to
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// the AIRCRAFT matrix
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sgMat4 VIEW_OFFSET;
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// sg versions of our friendly matrices
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sgMat4 LOCAL, TRANS, LARC_TO_SSG;
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// Update the view volume, position, and orientation
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void update();
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public:
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// Constructor
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FGViewerLookAt( void );
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// Destructor
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~FGViewerLookAt( void );
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//////////////////////////////////////////////////////////////////////
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// setter functions
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//////////////////////////////////////////////////////////////////////
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inline void set_view_forward( sgVec3 vf ) {
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set_dirty();
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sgCopyVec3( view_forward, vf );
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}
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inline void set_view_up( sgVec3 vf ) {
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set_dirty();
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sgCopyVec3( view_up, vf );
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}
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//////////////////////////////////////////////////////////////////////
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// accessor functions
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//////////////////////////////////////////////////////////////////////
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inline float *get_view_forward() { return view_forward; }
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inline float *get_view_up() { return view_up; }
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//////////////////////////////////////////////////////////////////////
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// derived values accessor functions
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//////////////////////////////////////////////////////////////////////
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};
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#endif // _VIEWER_LOOKAT_HXX
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