import processing.serial.*;

int lf = 10;    // Linefeed in ASCII
String myString = null;
Serial myPort;  // The serial port

int min, max, current;

void setup() {

  size(1920, 400);
  //frameRate(200);


  min = 1024;
  max = 0;

  // List all the available serial ports
  println(Serial.list());
  // I know that the first port in the serial list on my mac
  // is always my  Keyspan adaptor, so I open Serial.list()[0].
  // Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[0], 9600);
  myPort.clear();
  // Throw out the first reading, in case we started reading
  // in the middle of a string from the sender.
  myString = myPort.readStringUntil(lf);
  myString = null;
}

void draw() {
  while (myPort.available () > 0) {
    myString = myPort.readStringUntil(lf);
    if (myString != null) {
      myString = trim(myString);
      current = parseInt(myString);

      if (current > max) max = current;
      if (current < min) min = current;

      background( map(current, min, max, 0, 255), 200, 200 );

      println(current + " " + min + " "+ max);
    }
  }
}