X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FFDM%2FUFO.hxx;h=d22832f70d56f25f12eb88ad692566b58eb8ab02;hb=7e91e7e98b9ba6a3b74883527602ad8886e352b8;hp=6f522dad9d7fdb5442b48aaabe0891bf6e392056;hpb=9aaac1e35286c95b680a6db7cffac5a15e4e5904;p=flightgear.git

diff --git a/src/FDM/UFO.hxx b/src/FDM/UFO.hxx
index 6f522dad9..d22832f70 100644
--- a/src/FDM/UFO.hxx
+++ b/src/FDM/UFO.hxx
@@ -24,23 +24,45 @@
 #ifndef _UFO_HXX
 #define _UFO_HXX
 
-
 #include "flight.hxx"
 
 
 class FGUFO: public FGInterface {
-    double Throttle;
-    double Aileron;
-    double Elevator;
-    double Elevator_Trim;
-    double Rudder;
+private:
+
+    class lowpass {
+    private:
+        static double _dt;
+        double _coeff;
+        double _last;
+        bool _initialized;
+    public:
+        lowpass(double coeff) : _coeff(coeff), _initialized(false) {}
+        static inline void set_delta(double dt) { _dt = dt; }
+        double filter(double value) {
+            if (!_initialized) {
+                _initialized = true;
+                return _last = value;
+            }
+            double c = _dt / (_coeff + _dt);
+            return _last = value * c + _last * (1.0 - c);
+        }
+    };
+
+    lowpass *Throttle;
+    lowpass *Aileron;
+    lowpass *Elevator;
+    lowpass *Rudder;
+    lowpass *Aileron_Trim;
+    lowpass *Elevator_Trim;
+    lowpass *Rudder_Trim;
     SGPropertyNode_ptr Speed_Max;
 
 public:
     FGUFO( double dt );
     ~FGUFO();
 
-    // reset flight params to a specific position 
+    // reset flight params to a specific position
     void init();
 
     // update position based on inputs, positions, velocities, etc.