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

function param2()
  return "color rnd", 0, 100, 50
end

function main( x, y, p )

  local w = bs_width_max() * 0.25
  if w < 5 then
    w = 5
  end

  if not firstDraw then
    local distance = bs_distance( lastDrawX - x, lastDrawY - y )
    if distance < w * bs_param1()/20 then
      return 0
    end
  end

  local dx,dy = bs_dir()
  local nx,ny = bs_normal()
  local r,g,b = bs_forebg( 1.0 - math.random()*bs_param2()/100 )
  local idx = bs_grand(0,0.5)*w
  local rnd = 0.5 + math.random()+bs_param3()/50

  local num = math.random( 0, 2 )

  local i
  for i = 0,num do
    local rad = 3.14159 / 2 + 3.14159/math.random() 
    local tdx = bs_grand( 0, 3.5 ) * w + bs_param3()/50
    local len = math.random( 1, 2 ) * 3

    bs_bezier_begin( 0, 0 )
    bs_bezier_c( -0.08, -0.3, -0.06, -0.6, 0.0, -1.0 )
    bs_bezier_c( 0.04, -0.4, 0.0, -0.15, 0.0, 0.0 )
    bs_bezier_mul( w*len, w*len )
    bs_bezier_rotate( rad )
    bs_bezier_move( x, y )

    bs_fill( r,g,b, 255 )
  end

  lastDrawX = x
  lastDrawY = y
  firstDraw = false

  return 1
end

lastDrawX = 0
lastDrawY = 0
firstDraw = true