import processing.serial.*;
Serial myPort;  // Create object from Serial class
int tmp;

void setup() 
{
  size(255,255); //make our canvas 200 x 200 pixels big
  String portName = Serial.list()[0]; //change the 0 to a 1 or 2 etc. to match your port
  myPort = new Serial(this, portName, 9600);
}

void draw() {
  if (mousePressed == true) 
  {                           //if we clicked in the window
  tmp=mouseX;
   myPort.write(tmp);      
   // println(tmp);
  } 
}