From 8685e68b995ebf436c0e2a0441fc1c9c672dc8d0 Mon Sep 17 00:00:00 2001
From: david <david>
Date: Fri, 27 Sep 2002 22:04:21 +0000
Subject: [PATCH] Modified to use fgGetLowPass from utils.cxx.

---
 src/Instrumentation/altimeter.cxx | 8 ++++++--
 src/Instrumentation/altimeter.hxx | 2 --
 src/Systems/static.cxx            | 5 +++--
 3 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/Instrumentation/altimeter.cxx b/src/Instrumentation/altimeter.cxx
index b5450551e..08cfcb36e 100644
--- a/src/Instrumentation/altimeter.cxx
+++ b/src/Instrumentation/altimeter.cxx
@@ -7,6 +7,7 @@
 
 #include "altimeter.hxx"
 #include <Main/fg_props.hxx>
+#include <Main/util.hxx>
 
 
 // Altitude based on pressure difference from sea level.
@@ -82,8 +83,11 @@ Altimeter::update (double dt)
     if (_serviceable_node->getBoolValue()) {
         double pressure = _pressure_node->getDoubleValue();
         double setting = _setting_node->getDoubleValue();
-        _altitude_node
-            ->setDoubleValue(_altitude_table->interpolate(setting-pressure));
+        double altitude =
+            fgGetLowPass(_altitude_node->getDoubleValue(),
+                         _altitude_table->interpolate(setting - pressure),
+                         dt * 10);
+        _altitude_node->setDoubleValue(altitude);
     }
 }
 
diff --git a/src/Instrumentation/altimeter.hxx b/src/Instrumentation/altimeter.hxx
index b653a4c13..5a5250d29 100644
--- a/src/Instrumentation/altimeter.hxx
+++ b/src/Instrumentation/altimeter.hxx
@@ -46,8 +46,6 @@ public:
 
 private:
 
-    double _spin;
-
     SGPropertyNode_ptr _serviceable_node;
     SGPropertyNode_ptr _setting_node;
     SGPropertyNode_ptr _pressure_node;
diff --git a/src/Systems/static.cxx b/src/Systems/static.cxx
index 9e2b6aff1..7f9a287be 100644
--- a/src/Systems/static.cxx
+++ b/src/Systems/static.cxx
@@ -5,6 +5,7 @@
 
 #include "static.hxx"
 #include <Main/fg_props.hxx>
+#include <Main/util.hxx>
 
 
 StaticSystem::StaticSystem ()
@@ -37,11 +38,11 @@ void
 StaticSystem::update (double dt)
 {
     if (_serviceable_node->getBoolValue()) {
+        
         double target = _pressure_in_node->getDoubleValue();
         double current = _pressure_out_node->getDoubleValue();
         double delta = target - current;
-        current += delta * dt;
-        _pressure_out_node->setDoubleValue(current);
+        _pressure_out_node->setDoubleValue(fgGetLowPass(current, target, dt));
     }
 }
 
-- 
2.39.5