// viewer.hxx -- class for managing a viewer in the flightgear world. // // Written by Curtis Olson, started August 1997. // overhaul started October 2000. // // Copyright (C) 1997 - 2000 Curtis L. Olson - curt@flightgear.org // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License as // published by the Free Software Foundation; either version 2 of the // License, or (at your option) any later version. // // This program 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 // 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., 675 Mass Ave, Cambridge, MA 02139, USA. // // $Id$ #ifndef _VIEWER_HXX #define _VIEWER_HXX #ifndef __cplusplus # error This library requires C++ #endif #include #include // plib include // Define a structure containing view information class FGViewer { private: // flag forcing a recalc of derived view parameters bool dirty; protected: // the current view offset angle from forward (rotated about the // view_up vector) double view_offset; // the goal view offset angle (used for smooth view changes) double goal_view_offset; // geodetic view position sgdVec3 geod_view_pos; // absolute view position in earth coordinates sgdVec3 abs_view_pos; // view position in opengl world coordinates (this is the // abs_view_pos translated to scenery.center) sgVec3 view_pos; // radius to sea level from center of the earth (m) double sea_level_radius; // cartesion coordinates of current lon/lat if at sea level // translated to scenery.center sgVec3 zero_elev; // pilot offset from center of gravity. The X axis is positive // out the tail, Y is out the right wing, and Z is positive up. // Distances in meters of course. sgVec3 pilot_offset; // vector in cartesian coordinates from current position to the // postion on the earth's surface the sun is directly over sgVec3 to_sun; // surface direction to go to head towards sun sgVec3 surface_to_sun; // vector in cartesian coordinates from current position to the // postion on the earth's surface the moon is directly over sgVec3 to_moon; // surface direction to go to head towards moon sgVec3 surface_to_moon; // surface vector heading south sgVec3 surface_south; // surface vector heading east (used to unambiguously align sky // with sun) sgVec3 surface_east; // world up vector (normal to the plane tangent to the earth's // surface at the spot we are directly above sgVec3 world_up; // sg versions of our friendly matrices sgMat4 VIEW, VIEW_ROT, UP; inline void set_dirty() { dirty = true; } inline void set_clean() { dirty = false; } // Update the view volume, position, and orientation virtual void update(); public: // Constructor FGViewer( void ); // Destructor virtual ~FGViewer( void ); ////////////////////////////////////////////////////////////////////// // setter functions ////////////////////////////////////////////////////////////////////// inline void set_view_offset( double a ) { set_dirty(); view_offset = a; } inline void inc_view_offset( double amt ) { set_dirty(); view_offset += amt; } inline void set_goal_view_offset( double a) { set_dirty(); goal_view_offset = a; } inline void set_geod_view_pos( double lon, double lat, double alt ) { // data should be in radians and meters asl set_dirty(); // cout << "set_geod_view_pos = " << lon << ", " << lat << ", " << alt // << endl; sgdSetVec3( geod_view_pos, lon, lat, alt ); } inline void set_pilot_offset( float x, float y, float z ) { set_dirty(); sgSetVec3( pilot_offset, x, y, z ); } inline void set_sea_level_radius( double r ) { // data should be in meters from the center of the earth set_dirty(); sea_level_radius = r; } ////////////////////////////////////////////////////////////////////// // accessor functions ////////////////////////////////////////////////////////////////////// inline bool is_dirty() const { return dirty; } inline double get_view_offset() const { return view_offset; } inline double get_goal_view_offset() const { return goal_view_offset; } inline double *get_geod_view_pos() { return geod_view_pos; } inline float *get_pilot_offset() { return pilot_offset; } inline double get_sea_level_radius() const { return sea_level_radius; } ////////////////////////////////////////////////////////////////////// // derived values accessor functions ////////////////////////////////////////////////////////////////////// inline double *get_abs_view_pos() { if ( dirty ) { update(); } return abs_view_pos; } inline float *get_view_pos() { if ( dirty ) { update(); } return view_pos; } inline float *get_zero_elev() { if ( dirty ) { update(); } return zero_elev; } inline float *get_surface_south() { if ( dirty ) { update(); } return surface_south; } inline float *get_surface_east() { if ( dirty ) { update(); } return surface_east; } inline float *get_world_up() { if ( dirty ) { update(); } return world_up; } inline const sgVec4 *get_VIEW() { if ( dirty ) { update(); } return VIEW; } inline const sgVec4 *get_VIEW_ROT() { if ( dirty ) { update(); } return VIEW_ROT; } inline const sgVec4 *get_UP() { if ( dirty ) { update(); } return UP; } ////////////////////////////////////////////////////////////////////// // need to fix these ////////////////////////////////////////////////////////////////////// inline float *get_to_sun() { return to_sun; } inline void set_to_sun( float x, float y, float z ) { sgSetVec3( to_sun, x, y, z ); } inline float *get_surface_to_sun() { return surface_to_sun; } inline void set_surface_to_sun( float x, float y, float z) { sgSetVec3( surface_to_sun, x, y, z ); } inline float *get_to_moon() { return to_moon; } inline void set_to_moon( float x, float y, float z) { sgSetVec3( to_moon, x, y, z ); } inline float *get_surface_to_moon() { return surface_to_moon; } inline void set_surface_to_moon( float x, float y, float z) { sgSetVec3( surface_to_moon, x, y, z ); } }; #endif // _VIEWER_HXX