// import the Serial library for Processing
import processing.serial.*;

// create a memory object for the incoming data
Serial arduinoIn;

// create an array to put the incoming values into
int[] inputVals;

void setup() {
  size(400, 1024);
  // list all available Serial devices (for us to find the Arduino)
  println(Serial.list());

  // connect the memory object to the correct USB device (Arduino)
  arduinoIn = new Serial(this, Serial.list()[1], 9600);

  // buffer (store) the incoming data until a '\n' (newline) is recieved
  // then call the 'serialEvent()' function.
  arduinoIn.bufferUntil('\n');
}

void draw() {
  background(0);
  //draw some bars to visualize the incoming values
  for (int i = 0; i<inputVals.length; i++) {
    rect(30+i*50, height, 20, -inputVals[i]);
  }
}

// the 'void serialEvent' function is triggered each time a '\n' is discovered 
// in the Serial buffer. The function executes and passes the values 
// stored in the memory of 'arduinoIn'

void serialEvent (Serial arduinoIn) {
  // convert the incoming Serial value to a String and put in memory
  String inString = arduinoIn.readStringUntil('\n');

  // only continue if there's actually anything stored in the String
  if (inString != null) {
    //print the raw incoming string to the console
    println(inString);
    // trim off any whitespace:
    inString = trim(inString);
    // split the incoming string and put the values in the inputVals array
    inputVals = int(split(inString, '-'));
  }
}