Added magnetic compass instrument.

Removed some unused bind/unbind methods.

Improved responsiveness of slip-skid ball.

Some minor cleanups.

src/Instrumentation/Makefile.am

@@ -8,6 +8,7 @@ libInstrumentation_a_SOURCES = instrument_mgr.cxx instrument_mgr.hxx \
                                turn_indicator.cxx turn_indicator.hxx \
                                slip_skid_ball.cxx slip_skid_ball.hxx \
                                heading_indicator.cxx heading_indicator.hxx \
-                               vertical_speed_indicator.cxx vertical_speed_indicator.hxx
+                               vertical_speed_indicator.cxx vertical_speed_indicator.hxx \
+                               mag_compass.cxx mag_compass.hxx
 
 INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/src

src/Instrumentation/airspeed_indicator.cxx

@@ -35,17 +35,6 @@ AirspeedIndicator::init ()
                   true);
 }
 
-void
-AirspeedIndicator::bind ()
-{
-}
-
-void
-AirspeedIndicator::unbind ()
-{
-}
-
-
 #ifndef SEA_LEVEL_DENSITY_SLUGFG3
 # define SEA_LEVEL_DENSITY_SLUGFT3 0.002378
 #endif

src/Instrumentation/airspeed_indicator.hxx

@@ -37,8 +37,6 @@ public:
     virtual ~AirspeedIndicator ();
 
     virtual void init ();
-    virtual void bind ();
-    virtual void unbind ();
     virtual void update (double dt);
 
 private:

src/Instrumentation/altimeter.cxx

@@ -67,16 +67,6 @@ Altimeter::init ()
         fgGetNode("/instrumentation/altimeter/indicated-altitude-ft", true);
 }
 
-void
-Altimeter::bind ()
-{
-}
-
-void
-Altimeter::unbind ()
-{
-}
-
 void
 Altimeter::update (double dt)
 {

src/Instrumentation/altimeter.hxx

@@ -40,8 +40,6 @@ public:
     virtual ~Altimeter ();
 
     virtual void init ();
-    virtual void bind ();
-    virtual void unbind ();
     virtual void update (double dt);
 
 private:

src/Instrumentation/instrument_mgr.cxx

@@ -12,6 +12,7 @@
 #include "slip_skid_ball.hxx"
 #include "heading_indicator.hxx"
 #include "vertical_speed_indicator.hxx"
+#include "mag_compass.hxx"
 
 
 FGInstrumentMgr::FGInstrumentMgr ()
@@ -23,6 +24,7 @@ FGInstrumentMgr::FGInstrumentMgr ()
     set_subsystem("ball", new SlipSkidBall);
     set_subsystem("hi", new HeadingIndicator);
     set_subsystem("vsi", new VerticalSpeedIndicator);
+    set_subsystem("compass", new MagCompass);
 }
 
 FGInstrumentMgr::~FGInstrumentMgr ()

src/Instrumentation/slip_skid_ball.cxx

@@ -19,22 +19,25 @@ SlipSkidBall::~SlipSkidBall ()
 void
 SlipSkidBall::init ()
 {
-    _y_accel_node = fgGetNode("/orientation/roll-rate-degps", true);
-    _z_accel_node = fgGetNode("/orientation/yaw-rate-degps", true);
+    _serviceable_node =
+        fgGetNode("/instrumentation/slip-skid-ball/serviceable", true);
+    _y_accel_node = fgGetNode("/accelerations/pilot/y-accel-fps_sec", true);
+    _z_accel_node = fgGetNode("/accelerations/pilot/z-accel-fps_sec", true);
     _out_node =
         fgGetNode("/instrumentation/slip-skid-ball/indicated-slip-skid", true);
 }
 
 void
-SlipSkidBall::update (double dt)
+SlipSkidBall::update (double delta_time_sec)
 {
+    if (_serviceable_node->getBoolValue()) {
         double d = -_z_accel_node->getDoubleValue();
-    if (d < 60.0)               // originally 1 radian
-        d = 60.0;
-    double pos = _y_accel_node->getDoubleValue()/d;
-    pos = fgGetLowPass(_last_pos, pos, dt);
-    _last_pos = pos;
+        if (d < 1.0)
+            d = 1.0;
+        double pos = _y_accel_node->getDoubleValue() / d * 5.0;
+        pos = fgGetLowPass(_out_node->getDoubleValue(), pos, delta_time_sec);
         _out_node->setDoubleValue(pos);
+    }
 }
 
 // end of slip_skid_ball.cxx

src/Instrumentation/slip_skid_ball.hxx

@@ -45,6 +45,7 @@ private:
     Gyro _gyro;
     double _last_pos;
 
+    SGPropertyNode_ptr _serviceable_node;
     SGPropertyNode_ptr _y_accel_node;
     SGPropertyNode_ptr _z_accel_node;
     SGPropertyNode_ptr _out_node;

src/Instrumentation/vertical_speed_indicator.cxx

@@ -32,16 +32,6 @@ VerticalSpeedIndicator::init ()
                   true);
 }
 
-void
-VerticalSpeedIndicator::bind ()
-{
-}
-
-void
-VerticalSpeedIndicator::unbind ()
-{
-}
-
 void
 VerticalSpeedIndicator::update (double dt)
 {

src/Instrumentation/vertical_speed_indicator.hxx

@@ -36,8 +36,6 @@ public:
     virtual ~VerticalSpeedIndicator ();
 
     virtual void init ();
-    virtual void bind ();
-    virtual void unbind ();
     virtual void update (double dt);
 
 private: