// Example by Tom Igoe
// Modified by Michihito Mizutani

import processing.serial.*;

Serial myPort;  // The serial port
String inString;//= new byte[7];  // Input string from serial port:
int lf = 10;      // ASCII linefeed

void setup() {
  // List all the available serial ports:
  println(Serial.list());

  myPort = new Serial(this, Serial.list()[1], 9600);
  myPort.bufferUntil(lf);
}

void draw() {
  if (inString != null){
    if (inString.length() < 4) {
      int inInteger = Integer.parseInt(inString);
      println(inInteger);
      fill(255-inInteger,255-inInteger,255-inInteger);
      rect(0,0,100,200);
    } 
  }
}

void serialEvent(Serial p) {
  String inBuffer = myPort.readString();
  int l = inBuffer.length();
  inString = inBuffer.substring(0, l-1);
    
}