#include <Mouse.h>

int horzPin = A0;
int vertPin = A1;
int selPin = 9;

char vertZero, horzZero;
char vertValue, horzValue;
const char sensitivity = 200;
char mouseClickFlag = 0;

void setup()
{
  Serial.begin(9600);
  pinMode(horzPin, INPUT);
  pinMode(vertPin, INPUT);
  pinMode(selPin, INPUT_PULLUP);
  Mouse.begin();
  delay(1000);
  vertZero = analogRead(vertPin);
  horzZero = analogRead(horzPin);
}

void loop()
{
  vertValue = analogRead(vertPin) - vertZero;
  horzValue = analogRead(horzPin) - horzZero;

  // Uncomment the following lines to debug joystick values
  // Serial.print("x ");
  // Serial.println(horzValue);
  // Serial.print("y ");
  // Serial.println(vertValue);

  if (vertValue != 0)
    Mouse.move(0, vertValue / sensitivity, 0);
  if (horzValue != 0)
    Mouse.move((horzValue / sensitivity) * -1, 0, 0);

  if ((digitalRead(selPin) == LOW) && (!mouseClickFlag))
  {
    mouseClickFlag = 1;
    Mouse.press(MOUSE_LEFT);
  }
  else if ((digitalRead(selPin) == HIGH) && (mouseClickFlag))
  {
    mouseClickFlag = 0;
    Mouse.release(MOUSE_LEFT);
  }
}