Added new sample programs to the eclipse plugins for C++ and Java.

Modified examples.xml for the corresponding added programs.

Change-Id: I3d86c570f446ec8cf3013c58dd94215f2907bbb1

eclipse-plugins/edu.wpi.first.wpilib.plugins.cpp/resources/templates/examples/Potentiometer/src/Robot.cpp

@@ -0,0 +1,84 @@
+#include "WPILib.h"
+
+/**
+ * This is a sample program to demonstrate the use of a soft potentiometer and proportional
+ * control to reach and maintain position setpoints on an elevator mechanism. A joystick
+ * button is used to switch elevator setpoints.
+ *
+ * WARNING: While it may look like a good choice to use for your code if you're inexperienced,
+ * don't. Unless you know what you are doing, complex code will be much more difficult under
+ * this system. Use IterativeRobot or Command-Based instead if you're new.
+ */
+class Robot: public SampleRobot
+{
+
+		const int potChannel = 1; //analog input pin
+	    const int motorChannel = 7; //PWM channel
+	    const int joystickChannel = 0; //usb number in DriverStation
+	    const int buttonNumber = 4; //joystick button
+
+	    const double pGain = 1.0; //proportional speed constant
+	    double motorSpeed;
+	    double currentPosition; //sensor voltage reading corresponding to current elevator position
+
+	    AnalogInput *potentiometer;
+	    Victor *elevatorMotor;
+	    Joystick *joystick;
+
+public:
+	Robot() :
+			SampleRobot()
+	{
+		//make objects for the potentiometer, elevator motor controller, and joystick
+		potentiometer = new AnalogInput(potChannel);
+		elevatorMotor = new Victor(motorChannel);
+		joystick = new Joystick(joystickChannel);
+	}
+
+	/**
+	 * Runs during autonomous.
+	 */
+	void Autonomous()
+	{
+
+	}
+
+	/**
+	 *
+	 */
+	void OperatorControl() {
+		bool buttonState;
+		bool prevButtonState = false;
+
+		int index = 0; //setpoint array index
+	    double currentSetpoint; //holds desired setpoint
+	    const int size = 3; //number of setpoints
+	    const double setpoints[size] = {1.0, 2.6, 4.3}; //bottom, middle, and top elevator setpoints
+		currentSetpoint = setpoints[0]; //set to first setpoint
+
+		while (IsOperatorControl() && IsEnabled()) {
+			buttonState = joystick->GetRawButton(buttonNumber); //check if button is pressed
+
+			//if button has been pressed and released once
+			if (buttonState && !prevButtonState) {
+				index = (index + 1) % size; //increment set point, reset if at maximum
+				currentSetpoint = setpoints[index]; //set setpoint
+			}
+			prevButtonState = buttonState; //record previous button state
+
+			currentPosition = potentiometer->GetAverageVoltage(); //get position value
+			motorSpeed = (currentPosition - currentSetpoint)*pGain; //convert position error to speed
+			elevatorMotor->Set(motorSpeed); //drive elevator motor
+		}
+	}
+
+	/**
+	 * Runs during test mode.
+	 */
+	void Test()
+	{
+
+	}
+};
+
+START_ROBOT_CLASS(Robot);