// This Processing code receives G-force measurements from
// an accelerometer that is connected to analog pins 0 and 1
// on an Arduino. 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 other programming languages.
//
// The Arduino board runs standard Firmata code, so you don't
// need to write its program.

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() {
  // println(Arduino.list());
  size(200,200);
  stroke(255);

  // connect to my Arduino board via serial port COM17 at 57600 bps.
  // make sure the baudrate (bps) matches that of the firmata code
  // uploaded to the Arduino board!
  my_arduino = new Arduino(this, "COM17", 57600);
}

void draw() {
  background(102);
  
  // read two G-force measurements from Arduino analog pins 0 and 1.
  gx = my_arduino.analogRead(0) - 500;
  gy = my_arduino.analogRead(1) - 500;
  
  line(100, 100, 100 + gx, 100 + gy);
}