Factory methods for FG1000

- Use Factories to handle multiple FG1000 calls better.
- Fix DirectTo Map center.

Aircraft/Instruments-3d/FG1000/Nasal/FG1000.nas

@@ -17,6 +17,17 @@ io.load_nasal(nasal_dir ~ '/GUI.nas', "fg1000");
 
 var FG1000 = {
 
+_instance : nil,
+
+# Factory method
+getInstance : func(EIS_Class = nil, EIS_SVG = nil) {
+  if (FG1000._instance == nil) {
+    FG1000._instance = FG1000.new(EIS_Class, EIS_SVG);
+  }
+
+  return FG1000._instance;
+},
+
 new : func(EIS_Class = nil, EIS_SVG = nil) {
   var obj = {
     parents : [FG1000],
@@ -51,8 +62,18 @@ setEIS : func(EIS_Class, EIS_SVG) {
   me.EIS_SVG = EIS.SVG;
 },
 
-addMFD : func(index, targetcanvas=nil, screenObject=nil) {
-  if (me.displays[index] != nil) {
+getDisplay : func(index) {
+  return me.displays[index];
+},
+
+# Add an MFD, optionally setting the index. Returns the index of the MFD.
+addMFD : func(index=nil, targetcanvas=nil, screenObject=nil) {
+
+  if (index == nil) {
+    index = size(keys(me.displays));
+    debug.dump(keys(me.displays));
+    print("No index passed.  Defaulting to " ~ index);
+  } else if (me.displays[index] != nil) {
     print("FG1000 Index " ~ index ~ " already exists!");
     return
   }
@@ -68,6 +89,7 @@ addMFD : func(index, targetcanvas=nil, screenObject=nil) {
 
   var mfd = fg1000.MFD.new(me, me.EIS_Class, me.EIS_SVG, targetcanvas, index);
   me.displays[index] = mfd;
+  return index;
 },
 
 display : func(index, target_object=nil) {
@@ -89,7 +111,7 @@ displayGUI : func(index, scale=1.0) {
   }
 
   var mfd_canvas = me.displays[index].getCanvas();
-  var gui = fg1000.GUI.new(mfd_canvas, index, scale);
+  var gui = fg1000.GUI.new(me.displays[index], mfd_canvas, index, scale);
 },
 
 getConfigStore : func() {

Aircraft/Instruments-3d/FG1000/Nasal/GUI.nas

@@ -72,11 +72,11 @@ var GUI =
     { Id: 12, top_left: [1145, 830], bottom_right: [1200, 875] },
   ],
 
-  new : func(mfd_canvas, device_id, scale = 1.0)
+  new : func(mfd, mfd_canvas, device_id, scale = 1.0)
   {
     var obj = {
       parents : [ GUI ],
-      mfd : nil,
+      mfd : mfd,
       eisPublisher : nil,
       navcomPublisher : nil,
       navcomUpdater : nil,
@@ -171,6 +171,9 @@ var GUI =
 
   cleanup : func()
   {
+    # Clean up the MFD.  Particularly important to stop if picking up
+    # Emesary notifications.
+    me.mfd.del();
     # Clean up the window itself
     call(canvas.Window.del, [], me.window);
   },

Aircraft/Instruments-3d/FG1000/Nasal/Interfaces/GenericInterfaceController.nas

@@ -13,6 +13,17 @@ io.load_nasal(nasal_dir ~ 'Interfaces/GenericADCPublisher.nas', "fg1000");
 
 var GenericInterfaceController = {
 
+  _instance : nil,
+
+  # Factory method
+  getInstance : func() {
+    if (GenericInterfaceController._instance == nil) {
+      GenericInterfaceController._instance = GenericInterfaceController.new();
+    }
+
+    return GenericInterfaceController._instance;
+  },
+
   new : func() {
     var obj = {
       parents : [GenericInterfaceController],

Aircraft/Instruments-3d/FG1000/Nasal/MFDPages/DirectTo/DirectTo.nas

@@ -69,7 +69,7 @@ var DirectTo =
     # We will use the screen range for zooming.
     obj.DirectToChart.setRange(8.0);
     obj.DirectToChart.setScreenRange(300/2.0);
-    obj.DirectToChart.setTranslation(1045, 485);
+    obj.DirectToChart.setTranslation(860, 440);
     obj.DirectToChart.set("clip-frame", canvas.Element.LOCAL);
     obj.DirectToChart.set("clip", "rect(-160px, 160px, 160px, -160px)");
 

gui/menubar.xml

@@ -827,16 +827,21 @@
 				<command>nasal</command>
 				<script>
 					var nasal_dir = getprop("/sim/fg-root") ~ "/Aircraft/Instruments-3d/FG1000/Nasal/";
-					io.load_nasal(nasal_dir ~ 'FG1000.nas', "fg1000");
-					io.load_nasal(nasal_dir ~ 'Interfaces/GenericInterfaceController.nas', "fg1000");
+					if (! defined("fg1000")) {
+						print("Loading FG1000 libraries");
+						io.load_nasal(nasal_dir ~ 'FG1000.nas', "fg1000");
+						io.load_nasal(nasal_dir ~ 'Interfaces/GenericInterfaceController.nas', "fg1000");
+					}
 
-					var fg1000system = fg1000.FG1000.new();
-					fg1000system.addMFD(0);
-					fg1000system.displayGUI(0);
+					var fg1000system = fg1000.FG1000.getInstance();
+					var index = fg1000system.addMFD();
+					print("Index " ~ index);
+					fg1000system.displayGUI(index);
 
 					# Start the interface controller after the FG1000, as it will publish
 					# immediately and update the NAV/COM data.
-					var interfaceController = fg1000.GenericInterfaceController.new();
+					var interfaceController = fg1000.GenericInterfaceController.getInstance();
+					interfaceController.stop();
 					interfaceController.start();
 
 				</script>