如何在价格跌破支撑线时删除已失效的旧枢轴支撑线？

修改后的完整代码 #

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © kunthu

//@version=5
indicator("SR", "SR", true)

pivotBars                 = input.int(5)

var float pivotBarOpen    = 0.
var float pivotBarHigh    = 0.
var float pivotBarLow     = 0.
var float pivotBarClose   = 0.

pivotHighValue            = ta.pivothigh(pivotBars,pivotBars)
pivotLowValue             = ta.pivotlow(pivotBars,pivotBars)

pivotHighTrue             = na(pivotHighValue) ? false : true
pivotLowTrue              = na(pivotLowValue) ? false : true
doji                      = (high-low)/5 > math.abs(open-close)
barcolor(doji ? color.white : na, title = "Doji Bars", editable = false)

// 用数组存储所有支撑线，替代单个变量
var array<line> supportLines = array.new_line()

// 遍历数组，检查每条支撑线是否被跌破，跌破则删除并移除
if barstate.isconfirmed
    // 倒序遍历避免数组索引混乱
    for i = array.size(supportLines) - 1 downto 0
        currentLine = array.get(supportLines, i)
        linePrice = line.get_y1(currentLine)
        // 当最低价跌破支撑线时判定失效
        if low < linePrice
            line.delete(currentLine)
            array.remove(supportLines, i)

dojiSupportCondition      = pivotLowTrue and doji[pivotBars] and not ta.crossunder(low, ta.valuewhen(pivotLowTrue, low[pivotBars], 1))

if dojiSupportCondition
    pivotBarOpen          := open[pivotBars]
    pivotBarHigh          := high[pivotBars]
    pivotBarLow           := low[pivotBars]
    pivotBarClose         := close[pivotBars]
    // 创建新支撑线并添加到数组
    newSupportLine = line.new(bar_index - pivotBars, pivotLowValue, last_bar_index, pivotLowValue, xloc.bar_index, color = color.green)
    array.push(supportLines, newSupportLine)

关键改动说明 #

• 数组存储支撑线：原代码用单个变量存储支撑线，无法跟踪多条线且会覆盖旧线。改用array<line>类型数组，可以保存所有已创建的有效支撑线。
• 跌破检查机制：在每根确认的K线中倒序遍历数组，检查当前K线最低价是否跌破支撑线价格。若跌破则删除该线并从数组中移除，倒序遍历是为了避免删除元素后数组索引错乱。
• 新增支撑线入数组：创建新支撑线时将其加入数组，确保后续能被纳入跌破检查范围。

内容的提问来源于stack exchange，提问作者Kunthu Dhadda