All-Time High Marker

//version=5
indicator("All-Time High Marker", overlay=true)

// 計算歷史最高價
allTimeHigh = ta.highest(high, bar_index + 1)

// 如果現價等於歷史最高，就畫個符號
isATH = close >= allTimeHigh

plotshape(isATH, title="All-Time High", style=shape.labelup,
color=color.green, text="ATH", location=location.abovebar)