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1 // heading_indicator.hxx - a vacuum-powered heading indicator.
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_HEADING_INDICATOR_HXX
8 #define __INSTRUMENTS_HEADING_INDICATOR_HXX 1
9
10 #ifndef __cplusplus
11 # error This library requires C++
12 #endif
13
14 #include <simgear/misc/props.hxx>
15 #include <Main/fgfs.hxx>
16
17
18 /**
19  * Model a vacuum-powered heading indicator.
20  *
21  * This first, simple draft is hard-wired to vacuum pump #1.
22  *
23  * Input properties:
24  *
25  * /instrumentation/heading-indicator/serviceable
26  * /instrumentation/heading-indicator/spin
27  * /instrumentation/heading-indicator/offset-deg
28  * /orientation/heading-deg
29  * /systems/vacuum[0]/suction-inhg
30  *
31  * Output properties:
32  *
33  * /instrumentation/heading-indicator/indicated-heading-deg
34  */
35 class HeadingIndicator : public FGSubsystem
36 {
37
38 public:
39
40     HeadingIndicator ();
41     virtual ~HeadingIndicator ();
42
43     virtual void init ();
44     virtual void bind ();
45     virtual void unbind ();
46     virtual void update (double dt);
47
48 private:
49
50     double _last_heading_deg;
51
52     SGPropertyNode_ptr _serviceable_node;
53     SGPropertyNode_ptr _spin_node;
54     SGPropertyNode_ptr _offset_node;
55     SGPropertyNode_ptr _heading_in_node;
56     SGPropertyNode_ptr _suction_node;
57     SGPropertyNode_ptr _heading_out_node;
58     
59 };
60
61 #endif // __INSTRUMENTS_HEADING_INDICATOR_HXX