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flightgear/src/Instrumentation/heading_indicator.hxx

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// heading_indicator.hxx - a vacuum-powered heading indicator.
// Written by David Megginson, started 2002.
//
// This file is in the Public Domain and comes with no warranty.
#ifndef __INSTRUMENTS_HEADING_INDICATOR_HXX
#define __INSTRUMENTS_HEADING_INDICATOR_HXX 1
#ifndef __cplusplus
# error This library requires C++
#endif
#include <simgear/props/props.hxx>
#include <simgear/structure/subsystem_mgr.hxx>
#include "gyro.hxx"
/**
* Model a vacuum-powered heading indicator.
*
* Input properties:
*
* /instrumentation/"name"/serviceable
* /instrumentation/"name"/spin
* /instrumentation/"name"/offset-deg
* /orientation/heading-deg
* "vacuum_system"/suction-inhg
*
* Output properties:
*
* /instrumentation/"name"/indicated-heading-deg
*/
class HeadingIndicator : public SGSubsystem
{
public:
HeadingIndicator ( SGPropertyNode *node );
HeadingIndicator ();
virtual ~HeadingIndicator ();
virtual void init ();
virtual void bind ();
virtual void unbind ();
virtual void update (double dt);
private:
Gyro _gyro;
double _last_heading_deg;
string _name;
int _num;
string _suction;
SGPropertyNode_ptr _offset_node;
SGPropertyNode_ptr _heading_in_node;
SGPropertyNode_ptr _suction_node;
SGPropertyNode_ptr _heading_out_node;
};
#endif // __INSTRUMENTS_HEADING_INDICATOR_HXX