1 // scenery.hxx -- data structures and routines for managing scenery.
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29 # error This library requires C++
36 #include <simgear/compiler.h>
37 #include <simgear/structure/subsystem_mgr.hxx>
38 #include <simgear/math/point3d.hxx>
39 #include <simgear/scene/model/placementtrans.hxx>
40 #include <simgear/structure/ssgSharedPtr.hxx>
48 // Define a structure containing global scenery parameters
49 class FGScenery : public SGSubsystem {
50 // center of current scenery chunk
53 // next center of current scenery chunk
56 // FIXME this should be a views property
57 // angle of sun relative to current local horizontal
61 ssgSharedPtr<ssgRoot> scene_graph;
62 ssgSharedPtr<ssgBranch> terrain_branch;
63 ssgSharedPtr<ssgRoot> gnd_lights_root;
64 ssgSharedPtr<ssgRoot> vasi_lights_root;
65 ssgSharedPtr<ssgRoot> rwy_lights_root;
66 ssgSharedPtr<ssgRoot> taxi_lights_root;
67 ssgSharedPtr<ssgBranch> models_branch;
68 ssgSharedPtr<ssgBranch> aircraft_branch;
70 // list of all placement transform, used to move the scenery center on the fly.
71 typedef list<ssgSharedPtr<ssgPlacementTransform> > placement_list_type;
72 placement_list_type _placement_list;
79 // Implementation of SGSubsystem.
83 void update (double dt);
85 /// Compute the elevation of the scenery at geodetic latitude lat,
86 /// geodetic longitude lon and not higher than max_alt.
87 /// If the exact flag is set to true, the scenery center is moved to
88 /// gain a higher accuracy of that query. The center is restored past
89 /// that to the original value.
90 /// The altitude hit is returned in the alt argument.
91 /// The method returns true if the scenery is available for the given
92 /// lat/lon pair. If there is no scenery for that point, the altitude
93 /// value is undefined.
94 /// All values are meant to be in meters or degrees.
95 bool get_elevation_m(double lat, double lon, double max_alt,
96 double& alt, bool exact = false);
98 /// Compute the elevation of the scenery beow the cartesian point pos.
99 /// you the returned scenery altitude is not higher than the position
100 /// pos plus an ofset given with max_altoff.
101 /// If the exact flag is set to true, the scenery center is moved to
102 /// gain a higher accuracy of that query. The center is restored past
103 /// that to the original value.
104 /// The altitude hit is returned in the alt argument.
105 /// The method returns true if the scenery is available for the given
106 /// lat/lon pair. If there is no scenery for that point, the altitude
107 /// value is undefined.
108 /// All values are meant to be in meters.
109 bool get_cart_elevation_m(const sgdVec3& pos, double max_altoff,
110 double& radius, bool exact = false);
112 /// Compute the nearest intersection point of the line starting from
113 /// start going in direction dir with the terrain.
114 /// The input and output values should be in cartesian coordinates in the
115 /// usual earth centered wgs84 coordiante system. Units are meters.
116 /// On success, true is returned.
117 bool get_cart_ground_intersection(const sgdVec3& start, const sgdVec3& dir,
118 sgdVec3& nearestHit, bool exact = false);
120 inline const Point3D& get_center() const { return center; }
121 void set_center( const Point3D& p );
123 inline const Point3D& get_next_center() const { return next_center; }
124 inline void set_next_center( const Point3D& p ) { next_center = p; }
126 inline ssgRoot *get_scene_graph () const { return scene_graph; }
127 inline void set_scene_graph (ssgRoot * s) { scene_graph = s; }
129 inline ssgBranch *get_terrain_branch () const { return terrain_branch; }
130 inline void set_terrain_branch (ssgBranch * t) { terrain_branch = t; }
132 inline ssgRoot *get_gnd_lights_root () const {
133 return gnd_lights_root;
135 inline void set_gnd_lights_root (ssgRoot *r) {
139 inline ssgRoot *get_vasi_lights_root () const {
140 return vasi_lights_root;
142 inline void set_vasi_lights_root (ssgRoot *r) {
143 vasi_lights_root = r;
146 inline ssgRoot *get_rwy_lights_root () const {
147 return rwy_lights_root;
149 inline void set_rwy_lights_root (ssgRoot *r) {
153 inline ssgRoot *get_taxi_lights_root () const {
154 return taxi_lights_root;
156 inline void set_taxi_lights_root (ssgRoot *r) {
157 taxi_lights_root = r;
160 inline ssgBranch *get_models_branch () const {
161 return models_branch;
163 inline void set_models_branch (ssgBranch *t) {
167 inline ssgBranch *get_aircraft_branch () const {
168 return aircraft_branch;
170 inline void set_aircraft_branch (ssgBranch *t) {
174 void register_placement_transform(ssgPlacementTransform *trans);
175 void unregister_placement_transform(ssgPlacementTransform *trans);
179 #endif // _SCENERY_HXX