#include <Mouse.h>
#define DELAY 5

const int sw_pin = 8;
const int vrx_pin = A0;
const int vry_pin = A1;

const int base_x = 512;
const int base_y = 519;

const int max_x = 1023;
const int max_y = 1023;

const int rng = 14;

void setup() {                
  pinMode(sw_pin, INPUT_PULLUP);
  Mouse.begin();
}

int prev_clicked = 0;
int get_clicked() {
  int signal = !digitalRead(sw_pin);
  int ret = (signal && signal != prev_clicked) ? 1 : 0;
  prev_clicked = signal;
  return ret;
}

int read_direction(int analog_pin, int base, int max, int rng) {
  int signal = analogRead(analog_pin);
  if (signal > base) {
    return map (signal, base, max, 0, rng);
  } else if (signal < base) {
    return - map (signal, base, 0, 1, rng);
  } else { return 0; }
}

void loop() {
  int click = get_clicked();
  if (click) {
    Mouse.click();
  }
  int dirx = read_direction(vrx_pin, base_x, max_x, rng);
  int diry = read_direction(vry_pin, base_y, max_y, rng);
  if (diry != 0) {
    Mouse.move(0, diry, 0);
  }
  if (dirx != 0) {
    Mouse.move(dirx, 0, 0);
  }
  
  delay(DELAY);
}