X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FInstrumentation%2Fheading_indicator.cxx;h=d95a1a0844488106d0b5cf42a3f49b905793cd98;hb=def81b4de5f87c28b5afd92264e40e66e4fd93e3;hp=f7899b7bcb90294e76ee5bdd7351c885380adc3a;hpb=c6062ad93cf3bfbffb6dec63cd6844167bb56980;p=flightgear.git

diff --git a/src/Instrumentation/heading_indicator.cxx b/src/Instrumentation/heading_indicator.cxx
index f7899b7bc..d95a1a084 100644
--- a/src/Instrumentation/heading_indicator.cxx
+++ b/src/Instrumentation/heading_indicator.cxx
@@ -3,8 +3,13 @@
 //
 // This file is in the Public Domain and comes with no warranty.
 
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
 #include <simgear/compiler.h>
 #include <simgear/sg_inlines.h>
+#include <simgear/math/SGMath.hxx>
 #include <iostream>
 #include <string>
 #include <sstream>
@@ -13,7 +18,6 @@
 #include <Main/fg_props.hxx>
 #include <Main/util.hxx>
 
-
 HeadingIndicator::HeadingIndicator ( SGPropertyNode *node )
     :
     _name(node->getStringValue("name", "heading-indicator")),
@@ -33,14 +37,25 @@ HeadingIndicator::init ()
     branch = "/instrumentation/" + _name;
 
     SGPropertyNode *node = fgGetNode(branch.c_str(), _num, true );
-    _offset_node = node->getChild("offset-deg", 0, true);
+    if( NULL == (_offset_node = node->getChild("offset-deg", 0, false)) ) {
+      _offset_node = node->getChild("offset-deg", 0, true);
+      _offset_node->setDoubleValue( -fgGetDouble("/environment/magnetic-variation-deg") );
+    }
     _heading_in_node = fgGetNode("/orientation/heading-deg", true);
     _suction_node = fgGetNode(_suction.c_str(), true);
     _heading_out_node = node->getChild("indicated-heading-deg", 0, true);
     _heading_bug_error_node = node->getChild("heading-bug-error-deg", 0, true);
     _heading_bug_node = node->getChild("heading-bug-deg", 0, true);
+  
+    reinit();
+}
+
+void
+HeadingIndicator::reinit ()
+{
     _last_heading_deg = (_heading_in_node->getDoubleValue() +
                          _offset_node->getDoubleValue());
+    _gyro.reinit();
 }
 
 void