使用 Open Close 变化创建追踪止损

Question

在下一张紫色图像上，我使用下一个代码获得的 SL，黑色线条是我要查找的内容......有什么想法或提示怎么做吗？

https://www.tradingview.com/x/FqcyOzXj/

var float longSL_0 =na
longSL_initial :=  (nz(strategy.position_size[1])==0 and strategy.position_size>0) ?
     (strategy.position_avg_price  -  (strategy.position_avg_price*0.001)) : longSL_0

SL_trail = (open<close)?close-open : (close<open)?open-close:na

var float longSL_total =na
longSL_total := longSL_initial + SL_trail

longSL = (nz(strategy.position_size[1])==0 and strategy.position_size>0)? longSL_0:
     (strategy.position_size[1]>0 and strategy.position_size>0)?longSL_total:na