Add new joystick features

Axis counts other than six and POVs are both present in C++ and Java now

Add dynamic joystick axis counts, up to 12

Change-Id: Ieade5e61a89df822df8702cb32326e4635558778

Add support for POVs in C++

Change-Id: I12dc0fcaca605a256ddcf990eebde45767229171

Make POVs work in Java

Change-Id: Ie2d98adb416c1930f058bdd21c3e7d26289df503

wpilibc/wpilibC++Devices/src/Joystick.cpp

@@ -23,7 +23,7 @@ static bool joySticksInitialized = false;
 /**
  * Construct an instance of a joystick.
  * The joystick index is the usb port on the drivers station.
- * 
+ *
  * @param port The port on the driver station that the joystick is plugged into.
  */
 Joystick::Joystick(uint32_t port)
@@ -39,7 +39,7 @@ Joystick::Joystick(uint32_t port)
 	m_axes[kZAxis] = kDefaultZAxis;
 	m_axes[kTwistAxis] = kDefaultTwistAxis;
 	m_axes[kThrottleAxis] = kDefaultThrottleAxis;
-	
+
 	m_buttons[kTriggerButton] = kDefaultTriggerButton;
 	m_buttons[kTopButton] = kDefaultTopButton;
 
@@ -48,10 +48,10 @@ Joystick::Joystick(uint32_t port)
 
 /**
  * Version of the constructor to be called by sub-classes.
- * 
+ *
  * This constructor allows the subclass to configure the number of constants
  * for axes and buttons.
- * 
+ *
  * @param port The port on the driver station that the joystick is plugged into.
  * @param numAxisTypes The number of axis types in the enum.
  * @param numButtonTypes The number of button types in the enum.
@@ -148,7 +148,7 @@ float Joystick::GetThrottle()
 
 /**
  * Get the value of the axis.
- * 
+ *
  * @param axis The axis to read [1-6].
  * @return The value of the axis.
  */
@@ -159,10 +159,10 @@ float Joystick::GetRawAxis(uint32_t axis)
 
 /**
  * For the current joystick, return the axis determined by the argument.
- * 
+ *
  * This is for cases where the joystick axis is returned programatically, otherwise one of the
  * previous functions would be preferable (for example GetX()).
- * 
+ *
  * @param axis The axis to read.
  * @return The value of the axis.
  */
@@ -183,9 +183,9 @@ float Joystick::GetAxis(AxisType axis)
 
 /**
  * Read the state of the trigger on the joystick.
- * 
+ *
  * Look up which button has been assigned to the trigger and read its state.
- * 
+ *
  * @param hand This parameter is ignored for the Joystick class and is only here to complete the GenericHID interface.
  * @return The state of the trigger.
  */
@@ -196,9 +196,9 @@ bool Joystick::GetTrigger(JoystickHand hand)
 
 /**
  * Read the state of the top button on the joystick.
- * 
+ *
  * Look up which button has been assigned to the top and read its state.
- * 
+ *
  * @param hand This parameter is ignored for the Joystick class and is only here to complete the GenericHID interface.
  * @return The state of the top button.
  */
@@ -219,10 +219,10 @@ bool Joystick::GetBumper(JoystickHand hand)
 
 /**
  * Get the button value for buttons 1 through 12.
- * 
+ *
  * The buttons are returned in a single 16 bit value with one bit representing the state
- * of each button. The appropriate button is returned as a boolean value. 
- * 
+ * of each button. The appropriate button is returned as a boolean value.
+ *
  * @param button The button number to be read.
  * @return The state of the button.
  **/
@@ -231,11 +231,20 @@ bool Joystick::GetRawButton(uint32_t button)
 	return ((0x1 << (button-1)) & m_ds->GetStickButtons(m_port)) != 0;
 }
 
+/**
+ * Get the state of a POV on the joystick.
+ *
+ * @return the angle of the POV in degrees, or -1 if the POV is not pressed.
+ */
+int Joystick::GetPOV(uint32_t pov) {
+	return m_ds->GetStickPOV(m_port, pov);
+}
+
 /**
  * Get buttons based on an enumerated type.
- * 
+ *
  * The button type will be looked up in the list of buttons and then read.
- * 
+ *
  * @param button The type of button to read.
  * @return The state of the button.
  */
@@ -252,7 +261,7 @@ bool Joystick::GetButton(ButtonType button)
 
 /**
  * Get the channel currently associated with the specified axis.
- * 
+ *
  * @param axis The axis to look up the channel for.
  * @return The channel fr the axis.
  */
@@ -263,7 +272,7 @@ uint32_t Joystick::GetAxisChannel(AxisType axis)
 
 /**
  * Set the channel associated with a specified axis.
- * 
+ *
  * @param axis The axis to set the channel for.
  * @param channel The channel to set the axis to.
  */
@@ -275,7 +284,7 @@ void Joystick::SetAxisChannel(AxisType axis, uint32_t channel)
 /**
  * Get the magnitude of the direction vector formed by the joystick's
  * current position relative to its origin
- * 
+ *
  * @return The magnitude of the direction vector
  */
 float Joystick::GetMagnitude(){
@@ -285,7 +294,7 @@ float Joystick::GetMagnitude(){
 /**
  * Get the direction of the vector formed by the joystick and its origin
  * in radians
- * 
+ *
  * @return The direction of the vector in radians
  */
 float Joystick::GetDirectionRadians(){
@@ -295,10 +304,10 @@ float Joystick::GetDirectionRadians(){
 /**
  * Get the direction of the vector formed by the joystick and its origin
  * in degrees
- * 
- * uses acos(-1) to represent Pi due to absence of readily accessable Pi 
+ *
+ * uses acos(-1) to represent Pi due to absence of readily accessable Pi
  * constant in C++
- * 
+ *
  * @return The direction of the vector in degrees
  */
 float Joystick::GetDirectionDegrees(){