global gDrawSpeed

on startMovie
  sprite(2).trails = TRUE             --Turn on trails for the dot (sprite 2).
  sprite(2).constraint = 3            --Constrain the dot (sprite 2) to
                                      --the boundaries of the rectangle (sprite 3).
  gDrawSpeed = sprite(2).width        --Tie the drawing speed to the width of the dot.
end

on keyDown                            --When a key is pressed,
  case (the keyCode) of
    123:                              --if the key code represents the left arrow,
      sprite(2).locH = sprite(2).locH – gDrawSpeed
                                      --move the dot left by
                                      --the number of pixels that the dot is wide.
    124:                              --If the key code represents the right arrow,
      sprite(2).locH = sprite(2).locH + gDrawSpeed
                                      --move the dot right by
                                      --the number of pixels that the dot is wide.
    125:
							--If the key code represents the down arrow,
							sprite(2).locV = sprite(2).locV + gDrawSpeed
							--move the dot down by
							--the number of pixels that the dot is wide.
							126:
							--If the key code represents the up arrow,
							sprite(2).locV = sprite(2).locV – gDrawSpeed
							--move the dot up by
							--the number of pixels that the dot is wide.
  end case
  updateStage                         --Update the stage to show changes.
end