text: i=0
  k=1
  def setup():
      size(500,500)
      smooth()
      strokeWeight(1)
      background(0)
  def draw():
      global i
      global k
      stroke(i,20)
      line(mouseX, mouseY,random(0,500),random(0,500))
      i=i+k
      if(i==255):
          k=-1
      if(i==0):
          k=1
  def keyPressed():
      if(key=='s'):
          SaveFrame(" myProcessing .png")
  