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--scale漩涡半径 os 旋臂粗 c 颜色
function drawswirls(scale,os,c)
 for r=0,90*scale do
  local q=.05*sin(r/32-player.t)
  for a=0,1,.1 do
   circfill(64+r*cos(a+q),64+r*sin(a+q),r/14+os,c)
  end
 end
end