generic aar.nas (air-to-air-refueling). Meant to replace all the files

lying around everywhere. Used by the vulcan2 already. Cleanup pending.

Aircraft/Generic/aar.nas

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+# Properties under /consumables/fuel/tank[n]:
+# + level-gal_us    - Current fuel load.  Can be set by user code.
+# + level-lbs       - OUTPUT ONLY property, do not try to set
+# + selected        - boolean indicating tank selection.
+# + density-ppg     - Fuel density, in lbs/gallon.
+# + capacity-gal_us - Tank capacity 
+#
+# Properties under /engines/engine[n]:
+# + fuel-consumed-lbs - Output from the FDM, zeroed by this script
+# + out-of-fuel       - boolean, set by this code.
+
+# ==================================== timer stuff ===========================================
+
+# set the update period
+
+UPDATE_PERIOD = 0.3;
+
+# set the timer for the selected function
+
+registerTimer = func {
+	
+    settimer(arg[0], UPDATE_PERIOD);
+
+} # end function 
+
+# =============================== end timer stuff ===========================================
+
+
+
+initialized = 0;
+enabled = 0;
+
+#print ("running aar");
+#print (" enabled " , enabled,  " initialized ", initialized);  
+
+updateTanker = func {
+#print ("tanker update running ");
+				#if (!initialized ) {
+				#print("calling initialize");
+				#initialize();}
+    
+        Refueling = props.globals.getNode("/systems/refuel/contact");
+        AllAircraft = props.globals.getNode("ai/models").getChildren("aircraft");
+				AllMultiplayer = props.globals.getNode("ai/models").getChildren("multiplayer");
+        Aircraft = props.globals.getNode("ai/models/aircraft");
+        
+#   select all tankers which are in contact. For now we assume that it must be in 
+#		contact	with us.
+                
+        selectedTankers = [];
+				
+				if ( enabled ) { # check that AI Models are enabled, otherwise don't bother
+            foreach(a; AllAircraft) {
+                contact_node = a.getNode("refuel/contact");
+                id_node = a.getNode("id");
+                tanker_node = a.getNode("tanker");
+                
+                contact = contact_node.getValue();
+                id = id_node.getValue();
+                tanker = tanker_node.getValue();
+                
+				#print ("contact ", contact , " tanker " , tanker );
+                            
+                if (tanker and contact) {
+                    append(selectedTankers, a);
+                }
+            }
+						
+						foreach(m; AllMultiplayer) {
+                contact_node = m.getNode("refuel/contact");
+                id_node = m.getNode("id");
+                tanker_node = m.getNode("tanker");
+                
+                contact = contact_node.getValue();
+                id = id_node.getValue();
+                tanker = tanker_node.getValue();
+                
+#				print (" mp contact ", contact , " tanker " , tanker );
+                            
+                if (tanker and contact) {
+                    append(selectedTankers, m);
+                }
+            }
+        }
+         
+		#print ("tankers ", size(selectedTankers) );
+
+        if ( size(selectedTankers) >= 1 ){
+            Refueling.setBoolValue(1);
+        } else {
+            Refueling.setBoolValue(0);
+        }
+		registerTimer(updateTanker);
+}
+
+# Initalize: Make sure all needed properties are present and accounted
+# for, and that they have sane default values.
+
+initialize = func {
+   
+    AI_Enabled = props.globals.getNode("sim/ai/enabled");
+    Refueling = props.globals.getNode("/systems/refuel/contact",1);
+            
+    Refueling.setBoolValue(0);
+    enabled = AI_Enabled.getValue();
+        
+    initialized = 1;
+}
+
+initDoubleProp = func {
+    node = arg[0]; prop = arg[1]; val = arg[2];
+    if(node.getNode(prop) != nil) {
+        val = num(node.getNode(prop).getValue());
+    }
+    node.getNode(prop, 1).setDoubleValue(val);
+}
+
+# Fire it up
+if (!initialized) {initialize();}
+registerTimer(updateTanker);