From 31df14b691ae678d69c9fc66d3a77bf7ed271291 Mon Sep 17 00:00:00 2001
From: torsten <torsten>
Date: Wed, 7 Apr 2010 14:15:24 +0000
Subject: [PATCH] Initial import of the balloon scenario from gooneybird

---
 Nasal/balloons.nas | 29 +++++++++++++++++++++++++++++
 preferences.xml    |  1 +
 2 files changed, 30 insertions(+)
 create mode 100644 Nasal/balloons.nas

diff --git a/Nasal/balloons.nas b/Nasal/balloons.nas
new file mode 100644
index 000000000..be13b1da9
--- /dev/null
+++ b/Nasal/balloons.nas
@@ -0,0 +1,29 @@
+# If the balloon scenario is loaded and enabled,
+# place all balloons near the aircraft to get them loaded
+#
+_setlistener("/sim/signals/fdm-initialized", func {
+
+  var balloonScenarioFound = 0;
+  foreach( var scenario; props.globals.getNode("/sim/ai", 1 ).getChildren("scenario") ) {
+    if( scenario.getValue() == "balloon_demo" )
+      balloonScenarioFound = 1;
+  }
+  if( balloonScenarioFound != 0 ) {
+    var position = geo.aircraft_position();
+    var elevation = geo.elevation( position.lat(), position.lon() );
+    position.set_alt( elevation != nil ? elevation : 0.0 );
+
+    foreach( var tanker; props.globals.getNode("/ai/models",1).getChildren("tanker") ) {
+      var callsign = tanker.getNode("callsign").getValue();
+      if( callsign == nil ) continue;
+      if( string.match(callsign,"ballon*") ) {
+        tanker.getNode("position/latitude-deg",1).setDoubleValue( position.lat() );
+        tanker.getNode("position/longitude-deg",1).setDoubleValue( position.lon() );
+        tanker.getNode("position/altitude-ft", 1 ).setDoubleValue( position.alt() );
+      }
+    }
+  }
+  delete(globals, "balloons");
+});
+
+
diff --git a/preferences.xml b/preferences.xml
index 23af271a2..d7aeed51c 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -581,6 +581,7 @@ Started September 2000 by David Megginson, david@megginson.com
   <ai>
    <enabled type="bool">true</enabled>
    <scenario>nimitz_demo</scenario>
+   <!-- <scenario>balloon_demo</scenario> -->
    <!-- <scenario>aircraft_demo</scenario> -->
    <!-- <scenario>refueling_demo</scenario> -->
    <!-- <scenario>lead_aircraft</scenario> -->