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[flightgear.git] / src / Instrumentation / mag_compass.hxx
1 // mag_compass.hxx - an altimeter tied to the static port.
2 // Written by David Megginson, started 2002.
3 //
4 // This file is in the Public Domain and comes with no warranty.
5
6
7 #ifndef __INSTRUMENTS_MAG_COMPASS_HXX
8 #define __INSTRUMENTS_MAG_COMPASS_HXX 1
9
10 #ifndef __cplusplus
11 # error This library requires C++
12 #endif
13
14 #include <simgear/props/props.hxx>
15
16 #include <Main/fgfs.hxx>
17
18
19 /**
20  * Model a magnetic compass.
21  *
22  * Input properties:
23  *
24  * /instrumentation/magnetic-compass/serviceable
25  * /orientation/heading-deg
26  * /orientation/beta-deg
27  * /environment/magnetic-variation-deg
28  * /environment/magnetic-dip-deg
29  * /accelerations/ned/north-accel-fps_sec
30  * /accelerations/ned/east-accel-fps_sec
31  * /accelerations/ned/down-accel-fps_sec
32  *
33  * Output properties:
34  *
35  * /instrumentation/magnetic-compass/indicated-heading-deg
36  */
37 class MagCompass : public FGSubsystem
38 {
39
40 public:
41
42     MagCompass ();
43     virtual ~MagCompass ();
44
45     virtual void init ();
46     virtual void update (double dt);
47
48 private:
49
50     double _error_deg;
51     double _rate_degps;
52
53     SGPropertyNode_ptr _serviceable_node;
54     SGPropertyNode_ptr _heading_node;
55     SGPropertyNode_ptr _beta_node;
56     SGPropertyNode_ptr _variation_node;
57     SGPropertyNode_ptr _dip_node;
58     SGPropertyNode_ptr _y_accel_node;
59     SGPropertyNode_ptr _z_accel_node;
60     SGPropertyNode_ptr _north_accel_node;
61     SGPropertyNode_ptr _east_accel_node;
62     SGPropertyNode_ptr _down_accel_node;
63     SGPropertyNode_ptr _out_node;
64
65 };
66
67 #endif // __INSTRUMENTS_MAG_COMPASS_HXX