function param1()
  return "interval", 10, 100, 50
end

function main( x, y, p )

  local w = bs_width_max() * (0.5 + 0.5*p)
  if w < 5 then
    w = 5
  end

  if not firstDraw then
    local distance = bs_distance( lastDrawX - x, lastDrawY - y )
    if distance < w*4 * bs_param1()/100 then
      return 0
    end
  end

  local dx,dy = bs_dir()
  local nx,ny = bs_normal()

  local i
  local rad = 3.14159*2 / 10
  for i = 0,4 do
    bs_polygon( bs_rotate( 1, 0, rad * i*2 ) )
    bs_polygon( bs_rotate( 0.5, 0, rad * (i*2 + 1) ) )
  end
  bs_polygon( bs_rotate( 1, 0, rad * 0 ) )

  bs_polygon_mul( w, w )
  bs_polygon_rotate( bs_atan( dx, dy ) )
  bs_polygon_move( x, y )

  local r,g,b = bs_forebg( 0.50 + 0.50*math.random() )
  bs_fill( r,g,b, 255 )

  lastDrawX = x
  lastDrawY = y
  firstDraw = false

  return 1
end

lastDrawX = 0
lastDrawY = 0
firstDraw = true