Pine script 在tradingview上每日打开时打印水平光线

尝试在每日打开时绘制水平光线，我的代码由于某些原因不会绘制任何内容

//@version=4
study("Opens +", overlay=true)
higherTF1 = input("D", type=input.resolution)

dailyopen = security(syminfo.tickerid, higherTF1, open)

var line1 = line.new(bar_index, dailyopen,bar_index, dailyopen,   xloc=xloc.bar_index, style=line.style_solid,extend=extend.right)
line.set_color(line1, color.black)
line.set_width(line1, 1)

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临时解决办法

// mrtuanvn
//@version=4
study("Open Ray to right", overlay=true)
higherTF1 = input("D", type=input.resolution)

dailyopen = security(syminfo.tickerid, higherTF1, open)

line1 = line.new(x1=bar_index-1, y1=dailyopen, x2=bar_index, y2=dailyopen, xloc=xloc.bar_index, style=line.style_solid,extend=extend.right, color=color.green)

line.delete(line1[1])  // remove the previous line when new bar appears