Minor refactoring of Controller class:

- a controller can now answer whether it is intrinsically an analog controller

src/emucore/Control.hxx

@@ -171,6 +171,12 @@ class Controller : public Serializable
     */
     virtual void update() = 0;
 
+    /**
+      Answers whether the controller is intrinsically an analog controller.
+      Specific controllers should override and implement this method.
+    */
+    virtual bool isAnalog() const { return false; }
+
     /**
       Notification method invoked by the system after its reset method has
       been called.  It may be necessary to override this method for

src/emucore/Driving.hxx

@@ -47,6 +47,11 @@ class Driving : public Controller
     */
     void update() override;
 
+    /**
+      Answers whether the controller is intrinsically an analog controller.
+    */
+    bool isAnalog() const override { return true; }
+
     /**
       Determines how this controller will treat values received from the
       X/Y axis and left/right buttons of the mouse.  Since not all controllers

src/emucore/EventHandler.cxx

@@ -1701,18 +1701,7 @@ bool EventHandler::controllerIsAnalog(Controller::Jack jack) const
   const Controller& controller = jack == Controller::Left ?
       myOSystem.console().leftController() : myOSystem.console().rightController();
 
-  switch(controller.type())
-  {
-    case Controller::Paddles:
-    case Controller::Driving:
-    case Controller::AmigaMouse:
-    case Controller::AtariMouse:
-    case Controller::TrakBall:
-    case Controller::MindLink:
-      return true;
-    default:
-      return false;
-  }
+  return controller.isAnalog();
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

src/emucore/MindLink.hxx

@@ -72,6 +72,11 @@ class MindLink : public Controller
     */
     void update() override;
 
+    /**
+      Answers whether the controller is intrinsically an analog controller.
+    */
+    bool isAnalog() const override { return true; }
+
     /**
       Determines how this controller will treat values received from the
       X/Y axis and left/right buttons of the mouse.  Since not all controllers

src/emucore/Paddles.hxx

@@ -54,6 +54,11 @@ class Paddles : public Controller
     */
     void update() override;
 
+    /**
+      Answers whether the controller is intrinsically an analog controller.
+    */
+    bool isAnalog() const override { return true; }
+
     /**
       Determines how this controller will treat values received from the
       X/Y axis and left/right buttons of the mouse.  Since not all controllers

src/emucore/PointingDevice.hxx

@@ -57,6 +57,11 @@ class PointingDevice : public Controller
     */
     void update() override;
 
+    /**
+      Answers whether the controller is intrinsically an analog controller.
+    */
+    bool isAnalog() const override { return true; }
+
     /**
       Determines how this controller will treat values received from the
       X/Y axis and left/right buttons of the mouse.  Since not all controllers