PFont font;
String letter = "A"; 


void setup () {

  size (800, 800);
  background (255);

  font = createFont ("BirchStd", 10);
  textFont (font);
  textAlign (CENTER, CENTER);
}

void draw () {
}

void mouseMoved () {
  background (255);
    fill(mouseX-400, random (255), random (255), 100);
  textSize ((mouseX-400)*5+1);
  text (letter, width/2, mouseY);
}

void mouseDragged () {
fill(mouseX-400, random (255), random (255), 100);
  textSize ((mouseX-400)*5+1);
  text (letter, random (width), mouseY);
}
void keyReleased() {

  if (keyCode == CONTROL) saveFrame(timeStamp()+"_##.png");
  
  if (key != CODED && (int)key > 32) {
    letter = str(key);
  }

}


// timestamp
String timeStamp() {
  Calendar now = Calendar.getInstance();
  return String.format("%1$ty%1$tm%1$td_%1$tH%1$tM%1$tS", now);
}