1 // viewer.hxx -- class for managing a viewer in the flightgear world.
3 // Written by Curtis Olson, started August 1997.
4 // overhaul started October 2000.
6 // Copyright (C) 1997 - 2000 Curtis L. Olson - curt@flightgear.org
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 # error This library requires C++
33 #include <simgear/compiler.h>
35 #include <plib/sg.h> // plib include
38 // Define a structure containing view information
51 // flag forcing a recalc of derived view parameters
58 // the current view offset angle from forward (rotated about the
62 // the goal view offset angle (used for smooth view changes)
63 double goal_view_offset;
65 // geodetic view position
66 sgdVec3 geod_view_pos;
68 // absolute view position in earth coordinates
71 // view position in opengl world coordinates (this is the
72 // abs_view_pos translated to scenery.center)
75 // radius to sea level from center of the earth (m)
76 double sea_level_radius;
78 // cartesion coordinates of current lon/lat if at sea level
79 // translated to scenery.center
82 // pilot offset from center of gravity. The X axis is positive
83 // out the tail, Y is out the right wing, and Z is positive up.
84 // Distances in meters of course.
87 // vector in cartesian coordinates from current position to the
88 // postion on the earth's surface the sun is directly over
91 // surface direction to go to head towards sun
92 sgVec3 surface_to_sun;
94 // vector in cartesian coordinates from current position to the
95 // postion on the earth's surface the moon is directly over
98 // surface direction to go to head towards moon
99 sgVec3 surface_to_moon;
101 // surface vector heading south
102 sgVec3 surface_south;
104 // surface vector heading east (used to unambiguously align sky
108 // world up vector (normal to the plane tangent to the earth's
109 // surface at the spot we are directly above
112 // sg versions of our friendly matrices
113 sgMat4 VIEW, VIEW_ROT, UP;
115 inline void set_dirty() { dirty = true; }
116 inline void set_clean() { dirty = false; }
118 // Update the view volume, position, and orientation
119 virtual void update();
127 virtual ~FGViewer( void );
129 //////////////////////////////////////////////////////////////////////
131 //////////////////////////////////////////////////////////////////////
132 inline void set_view_offset( double a ) {
136 inline void inc_view_offset( double amt ) {
140 inline void set_goal_view_offset( double a) {
142 goal_view_offset = a;
144 inline void set_geod_view_pos( double lon, double lat, double alt ) {
145 // data should be in radians and meters asl
147 // cout << "set_geod_view_pos = " << lon << ", " << lat << ", " << alt
149 sgdSetVec3( geod_view_pos, lon, lat, alt );
151 inline void set_pilot_offset( float x, float y, float z ) {
153 sgSetVec3( pilot_offset, x, y, z );
155 inline void set_sea_level_radius( double r ) {
156 // data should be in meters from the center of the earth
158 sea_level_radius = r;
161 //////////////////////////////////////////////////////////////////////
162 // accessor functions
163 //////////////////////////////////////////////////////////////////////
164 inline int get_type() const { return _type ; }
165 inline int is_a( int t ) const { return get_type() == t ; }
166 inline bool is_dirty() const { return dirty; }
167 inline double get_view_offset() const { return view_offset; }
168 inline double get_goal_view_offset() const { return goal_view_offset; }
169 inline double *get_geod_view_pos() { return geod_view_pos; }
170 inline float *get_pilot_offset() { return pilot_offset; }
171 inline double get_sea_level_radius() const { return sea_level_radius; }
173 //////////////////////////////////////////////////////////////////////
174 // derived values accessor functions
175 //////////////////////////////////////////////////////////////////////
176 inline double *get_abs_view_pos() {
177 if ( dirty ) { update(); }
180 inline float *get_view_pos() {
181 if ( dirty ) { update(); }
184 inline float *get_zero_elev() {
185 if ( dirty ) { update(); }
188 inline float *get_surface_south() {
189 if ( dirty ) { update(); }
190 return surface_south;
192 inline float *get_surface_east() {
193 if ( dirty ) { update(); }
196 inline float *get_world_up() {
197 if ( dirty ) { update(); }
200 inline const sgVec4 *get_VIEW() {
201 if ( dirty ) { update(); }
204 inline const sgVec4 *get_VIEW_ROT() {
205 if ( dirty ) { update(); }
208 inline const sgVec4 *get_UP() {
209 if ( dirty ) { update(); }
213 //////////////////////////////////////////////////////////////////////
215 //////////////////////////////////////////////////////////////////////
216 inline float *get_to_sun() { return to_sun; }
217 inline void set_to_sun( float x, float y, float z ) {
218 sgSetVec3( to_sun, x, y, z );
220 inline float *get_surface_to_sun() { return surface_to_sun; }
221 inline void set_surface_to_sun( float x, float y, float z) {
222 sgSetVec3( surface_to_sun, x, y, z );
224 inline float *get_to_moon() { return to_moon; }
225 inline void set_to_moon( float x, float y, float z) {
226 sgSetVec3( to_moon, x, y, z );
228 inline float *get_surface_to_moon() { return surface_to_moon; }
229 inline void set_surface_to_moon( float x, float y, float z) {
230 sgSetVec3( surface_to_moon, x, y, z );
235 #endif // _VIEWER_HXX