bind the sky disable cutoff distance to a property

[flightgear.git] / src / Instrumentation / heading_indicator.cxx

diff --git a/src/Instrumentation/heading_indicator.cxx b/src/Instrumentation/heading_indicator.cxx
index e4b0c2438ddc27ff91fa678d0d8f3f57d1b1e15c..2cbbb9f2469b31e9fbf2dd39e318d24a17d8d3fa 100644 (file)
--- a/src/Instrumentation/heading_indicator.cxx
+++ b/src/Instrumentation/heading_indicator.cxx
@@ -17,6 +17,7 @@
 #include <Main/fg_props.hxx>
 #include <Main/util.hxx>
 
+#include <simgear/magvar/magvar.hxx>
 
 HeadingIndicator::HeadingIndicator ( SGPropertyNode *node )
     :
@@ -37,7 +38,10 @@ 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( -globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES );
+    }
     _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);