void setup ()
{
  size(620,470); // screen
  background(100);
  rect(50,20,550,400); // graph space
  //x(begin),y(begin),delta(x),delta(y)
  //Font assignment
    PFont font = loadFont("TrebuchetMS-13.vlw");
    textFont(font,13);
  fill(0); // set filling color
  text("Some Random Graph",260,15);
  // X-axis
  text("Number of samples ago",260,455);
  for(int i= 550; i>=0; i -=50)
  {
    text(i,600-i,430);
  }
  //Y-axis
  text("PWM",5,185);
  text("%",15,205);
  for(int j=0; j<= 100; j+=10)
  {
    text(j,35,420-4*j);
  }
}

void draw()
{
  color black = color(0);
  color white = color(255);
  int y = (int)random(400);
  int[] values = new int[550];
      for(int p=548; p>=0;p--) { // move all elements
    values[p] = (int)random(100)+100
    }
  while(true)
  {
    if (y => 400) {
        y = 399;
    } else if (y <= 1) {
        y = 2;
    } else {
        y += (round(random(1))*2)-1;
    }
      for(int p=548; p>=0;p--) // move all elements
      {
        values[p+1]=values[p];
      }
      values[0]=y;             // add new element
      for(int q=0, foo; q<550;q++) // print pixels
      {
        set(600-q,values[q],color(0)); //set(x,y,color)
        /*if (q == 100)
        {
          delay(10000);
        }*/
      }
      delay(10);
      rect(50,20,550,400) // paste a clean sheet over the points
  }
}