- added Melchior's patches to allow a joystick axis to act as a pair

of buttons (by adding "high" or "low" to the path before "binding")

src/Input/input.cxx

@@ -592,25 +592,25 @@ FGInput::_init_joystick ()
       center[j] = axis_node->getDoubleValue("center", center[j]);
 
       _read_bindings(axis_node, a.bindings, FG_MOD_NONE);
+
+      // Initialize the virtual axis buttons.
+      _init_button(axis_node->getChild("low"), a.low, "low");
+      a.low_threshold = axis_node->getDoubleValue("low-threshold", -0.9);
+      
+      _init_button(axis_node->getChild("high"), a.high, "high");
+      a.high_threshold = axis_node->getDoubleValue("high-threshold", 0.9);
     }
 
     //
     // Initialize the buttons.
     //
+    char buf[8];
     for (j = 0; j < nbuttons; j++) {
-      const SGPropertyNode * button_node = js_node->getChild("button", j);
-      if (button_node == 0) {
-	SG_LOG(SG_INPUT, SG_INFO, "No bindings for button " << j);
-	continue;
-      }
+      sprintf(buf, "%d", j);
+      _init_button(js_node->getChild("button", j),
+		   _joystick_bindings[i].buttons[j],
+		   buf);
 		   
-      button &b = _joystick_bindings[i].buttons[j];
-      
-      b.is_repeatable =
-	button_node->getBoolValue("repeatable", b.is_repeatable);
-
-				// Get the bindings for the button
-      _read_bindings(button_node, b.bindings, FG_MOD_NONE);
     }
 
     js->setMinRange(minRange);
@@ -620,6 +620,23 @@ FGInput::_init_joystick ()
 }
 
 
+inline void
+FGInput::_init_button (const SGPropertyNode * node,
+		       button &b,
+		       const string name)
+{	
+  if (node == 0)
+    SG_LOG(SG_INPUT, SG_INFO, "No bindings for button " << name);
+  else {
+    _read_bindings(node, b.bindings, FG_MOD_NONE);
+    b.is_repeatable = node->getBoolValue("repeatable", b.is_repeatable);
+    
+    		// Get the bindings for the button
+    _read_bindings(node, b.bindings, FG_MOD_NONE);
+  }
+}
+
+
 void
 FGInput::_update_keyboard ()
 {
@@ -663,13 +680,31 @@ FGInput::_update_joystick ()
 	for (unsigned int k = 0; k < a.bindings[modifiers].size(); k++)
 	  a.bindings[modifiers][k].fire(axis_values[j]);
       }
+     
+				// do we have to emulate axis buttons?
+      if (a.low.bindings[modifiers].size())
+	_update_button(_joystick_bindings[i].axes[j].low,
+		       modifiers,
+		       axis_values[j] < a.low_threshold);
+      
+      if (a.high.bindings[modifiers].size())
+	_update_button(_joystick_bindings[i].axes[j].high,
+		       modifiers,
+		       axis_values[j] > a.high_threshold);
     }
 
 				// Fire bindings for the buttons.
-    for (j = 0; j < _joystick_bindings[i].nbuttons; j++) {
-      bool pressed = ((buttons & (1 << j)) > 0);
-      button &b = _joystick_bindings[i].buttons[j];
+    for (j = 0; j < _joystick_bindings[i].nbuttons; j++)
+      _update_button(_joystick_bindings[i].buttons[j],
+		     modifiers,
+		     (buttons & (1 << j)) > 0);
+  }
+}
 
+
+inline void
+FGInput::_update_button (button &b, int modifiers, bool pressed)
+{
   if (pressed) {
 				// The press event may be repeated.
     if (!b.last_state || b.is_repeatable) {
@@ -687,8 +722,6 @@ FGInput::_update_joystick ()
 	  
   b.last_state = pressed;
 }  
-  }
-}
 
 
 void

src/Input/input.hxx

@@ -184,8 +184,6 @@ public:
 
 private:
 
-  typedef vector<FGBinding> binding_list_t;
-
 				// Constants
   enum 
   {
@@ -201,6 +199,8 @@ private:
   };
 
 
+  typedef vector<FGBinding> binding_list_t;
+
   /**
    * Settings for a key or button.
    */
@@ -221,11 +221,17 @@ private:
   struct axis {
     axis ()
       : last_value(9999999),
-	tolerance(0.002)
+	tolerance(0.002),
+	low_threshold(-0.9),
+	high_threshold(0.9)
     {}
     float last_value;
     float tolerance;
     binding_list_t bindings[FG_MOD_MAX];
+    float low_threshold;
+    float high_threshold;
+    struct button low;
+    struct button high;
   };
 
 
@@ -258,6 +264,14 @@ private:
   void _init_joystick ();
 
 
+  /**
+   * Initialize a single button.
+   */
+  inline void _init_button (const SGPropertyNode * node,
+			    button &b,
+			    const string name);
+
+
   /**
    * Update the keyboard.
    */
@@ -270,6 +284,12 @@ private:
   void _update_joystick ();
 
 
+  /**
+   * Update a single button.
+   */
+  inline void _update_button (button &b, int modifiers, bool pressed);
+
+
   /**
    * Read bindings and modifiers.
    */