// This Processing code receives G-force measurements from
// an analog accelerometer that is connected to Arduino analog
// input pins 0 and 1. It displays these values as a vector.
//
// To interact with the Arduino board, Processing uses the
// "cc.arduino.*" library. Such libraries also exist for
// Max/MSP and many other programming languages.
//
// The Arduino board runs "SimpleAnalogFirmata" code, so you
// don't need to write any Arduino code!

import processing.serial.*;    // firmata requires a serial connection
import cc.arduino.*;           // the firmata library for processing

Arduino my_arduino;            // declare an object of type "Arduino"
int gx, gy;

void setup() {
  size(200,200);
  stroke(255);

  // connect to the Arduino via serial port at 57600 bps.
  println(Serial.list());
  my_arduino = new Arduino(this, Serial.list()[0], 57600);
}

void draw() {
  // clear the canvas
  background(102);
  // read two G-force measurements from Arduino analog pins 0 and 1.
  gx = my_arduino.analogRead(0) - 512;
  gy = my_arduino.analogRead(1) - 512;
  // draw a line indicating the G-force value and direction
  line(100, 100, 100 + gx, 100 + gy);
}