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
43 // flag forcing a recalc of derived view parameters
48 // the current view offset angle from forward (rotated about the
52 // the goal view offset angle (used for smooth view changes)
53 double goal_view_offset;
55 // geodetic view position
56 sgdVec3 geod_view_pos;
58 // absolute view position in earth coordinates
61 // view position in opengl world coordinates (this is the
62 // abs_view_pos translated to scenery.center)
65 // radius to sea level from center of the earth (m)
66 double sea_level_radius;
68 // cartesion coordinates of current lon/lat if at sea level
69 // translated to scenery.center
72 // pilot offset from center of gravity. The X axis is positive
73 // out the tail, Y is out the right wing, and Z is positive up.
74 // Distances in meters of course.
77 // vector in cartesian coordinates from current position to the
78 // postion on the earth's surface the sun is directly over
81 // surface direction to go to head towards sun
82 sgVec3 surface_to_sun;
84 // vector in cartesian coordinates from current position to the
85 // postion on the earth's surface the moon is directly over
88 // surface direction to go to head towards moon
89 sgVec3 surface_to_moon;
91 // surface vector heading south
94 // surface vector heading east (used to unambiguously align sky
98 // world up vector (normal to the plane tangent to the earth's
99 // surface at the spot we are directly above
102 // sg versions of our friendly matrices
103 sgMat4 VIEW, VIEW_ROT, UP;
105 inline void set_dirty() { dirty = true; }
106 inline void set_clean() { dirty = false; }
108 // Update the view volume, position, and orientation
109 virtual void update();
117 virtual ~FGViewer( void );
119 //////////////////////////////////////////////////////////////////////
121 //////////////////////////////////////////////////////////////////////
122 inline void set_view_offset( double a ) {
126 inline void inc_view_offset( double amt ) {
130 inline void set_goal_view_offset( double a) {
132 goal_view_offset = a;
134 inline void set_geod_view_pos( double lon, double lat, double alt ) {
135 // data should be in radians and meters asl
137 // cout << "set_geod_view_pos = " << lon << ", " << lat << ", " << alt
139 sgdSetVec3( geod_view_pos, lon, lat, alt );
141 inline void set_pilot_offset( float x, float y, float z ) {
143 sgSetVec3( pilot_offset, x, y, z );
145 inline void set_sea_level_radius( double r ) {
146 // data should be in meters from the center of the earth
148 sea_level_radius = r;
151 //////////////////////////////////////////////////////////////////////
152 // accessor functions
153 //////////////////////////////////////////////////////////////////////
154 inline bool is_dirty() const { return dirty; }
155 inline double get_view_offset() const { return view_offset; }
156 inline double get_goal_view_offset() const { return goal_view_offset; }
157 inline double *get_geod_view_pos() { return geod_view_pos; }
158 inline float *get_pilot_offset() { return pilot_offset; }
159 inline double get_sea_level_radius() const { return sea_level_radius; }
161 //////////////////////////////////////////////////////////////////////
162 // derived values accessor functions
163 //////////////////////////////////////////////////////////////////////
164 inline double *get_abs_view_pos() {
165 if ( dirty ) { update(); }
168 inline float *get_view_pos() {
169 if ( dirty ) { update(); }
172 inline float *get_zero_elev() {
173 if ( dirty ) { update(); }
176 inline float *get_surface_south() {
177 if ( dirty ) { update(); }
178 return surface_south;
180 inline float *get_surface_east() {
181 if ( dirty ) { update(); }
184 inline float *get_world_up() {
185 if ( dirty ) { update(); }
188 inline const sgVec4 *get_VIEW() {
189 if ( dirty ) { update(); }
192 inline const sgVec4 *get_VIEW_ROT() {
193 if ( dirty ) { update(); }
196 inline const sgVec4 *get_UP() {
197 if ( dirty ) { update(); }
201 //////////////////////////////////////////////////////////////////////
203 //////////////////////////////////////////////////////////////////////
204 inline float *get_to_sun() { return to_sun; }
205 inline void set_to_sun( float x, float y, float z ) {
206 sgSetVec3( to_sun, x, y, z );
208 inline float *get_surface_to_sun() { return surface_to_sun; }
209 inline void set_surface_to_sun( float x, float y, float z) {
210 sgSetVec3( surface_to_sun, x, y, z );
212 inline float *get_to_moon() { return to_moon; }
213 inline void set_to_moon( float x, float y, float z) {
214 sgSetVec3( to_moon, x, y, z );
216 inline float *get_surface_to_moon() { return surface_to_moon; }
217 inline void set_surface_to_moon( float x, float y, float z) {
218 sgSetVec3( surface_to_moon, x, y, z );
223 #endif // _VIEWER_HXX