Pine script 如何在Pinescript中绘制从日高到日低的趋势线？

像图中一样，我创建了一个趋势线指示器，连接当天和前一天的高点和低点（仅2天）。但问题是，高点和低点正好相反。如何修复它？ 多谢各位

      //@version=4
      study("HL", shorttitle="HL", overlay=true)

      dayHighHTF  = security(syminfo.tickerid, "D", high, lookahead=true)
      prev1HighHTF  = security(syminfo.tickerid, "D", high[1], lookahead=true)
      dayLowHTF  = security(syminfo.tickerid, "D", low, lookahead=true)
      prev1LowHTF  = security(syminfo.tickerid, "D", low[1], lookahead=true)

      if (barstate.islast)
          line.new(x1=bar_index[24], y1=dayLowHTF, x2=bar_index, y2=dayHighHTF)
          line.new(x1=bar_index[49], y1=prev1LowHTF, x2=bar_index[25], y2=prev1HighHTF)