Pine Script循环生成横向box时位置偏移问题求助

问题描述 #

脚本基于锚定日期计算多组未来日期范围，支持两种周期波长（如120/50日历日），用box组件可视化每个时间段，通过xloc=xloc.bar_time定位横向位置，不同阶段用不同颜色区分：

• 正常情况：选择1-4次重复时，所有box显示正常
• 异常情况：选择5次及以上重复时，长波长（120天）对应的box会向右偏移，早期日期范围被省略，仅后期box显示正常
• 疑问：是否与回溯期（lookback period）有关？

脚本代码 #

//@version=5
indicator('Calendar Days 2', max_labels_count = 500, overlay = true)

// Inputs
anchor_date_DC = input.time(timestamp("01 Jan 2023 05:00"), "Anchor Date Bottom DC")
anchor_date_SC = input.time(timestamp("01 Jan 2023 05:00"), "Anchor Date Bottom SC")
cycle_period_DC = input.int(120, 'Cycle Period DC(Calendar Days)')
cycle_period_SC = input.int(50, 'Cycle Period SC (Calendar Days)')
number_dates = input.int(5, 'Number of Future Dates' )

// Conversions UNIX time
cycle_period_DC_unix = cycle_period_DC * 86400000
cycle_period_SC_unix = cycle_period_SC * 86400000

bottom_date_DC = anchor_date_DC - cycle_period_DC_unix
bottom_date_SC = anchor_date_SC - cycle_period_SC_unix

for i = 1 to number_dates

    // Draw Dominant Cycle (DC)
    bottom_date_DC := bottom_date_DC + cycle_period_DC_unix

    DC_bottom_up_mid = int(bottom_date_DC + (cycle_period_DC_unix/100*12.5))
    DC_bottom_up_end = int(bottom_date_DC + (cycle_period_DC_unix/100*37.5))
    DC_top_down_start = bottom_date_DC + (cycle_period_DC_unix/100*50)
    DC_top_down_mid = int(bottom_date_DC + (cycle_period_DC_unix/100*62.5))
    DC_top_down_end = int(bottom_date_DC + (cycle_period_DC_unix/100*87.5))
    bottom_date_next_DC = bottom_date_DC + cycle_period_DC_unix

    box.new(bottom_date_DC, 10, DC_bottom_up_mid, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0,bgcolor= color.new(color.rgb(0, 255, 8),70))    
    box.new(DC_bottom_up_mid, 10, DC_bottom_up_end, 19, xloc=xloc.bar_time, text=str.tostring(cycle_period_DC), border_color=color.new(#a1fbc1, 0), border_width=0, bgcolor=color.new(#a1fbc1, 70))
    box.new(DC_bottom_up_end, 10, DC_top_down_start, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0, bgcolor=color.new(color.rgb(0,255,8),70))
    box.new(DC_top_down_start, 10, DC_top_down_mid, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))
    box.new(DC_top_down_mid, 10, DC_top_down_end, 19, xloc=xloc.bar_time, border_color=color.new(#ff7d7d, 70), border_width=0, bgcolor=color.new(#ff7d7d, 70))
    box.new(DC_top_down_end, 10, bottom_date_next_DC, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))

    // Draw Secondary Cycle (SC)
    bottom_date_SC := bottom_date_SC + cycle_period_SC_unix

    SC_bottom_up_start = bottom_date_SC
    SC_bottom_up_mid = int(SC_bottom_up_start + (cycle_period_SC_unix/100*12.5))
    SC_bottom_up_end = int(SC_bottom_up_start + (cycle_period_SC_unix/100*37.5))
    SC_top_down_start = SC_bottom_up_start + (cycle_period_SC_unix/100*50)
    SC_top_down_mid = int(SC_bottom_up_start + (cycle_period_SC_unix/100*62.5))
    SC_top_down_end = int(SC_bottom_up_start + (cycle_period_SC_unix/100*87.5))
    bottom_date_next_SC = SC_bottom_up_start + cycle_period_SC_unix

    box.new(SC_bottom_up_start, 0, SC_bottom_up_mid, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0,bgcolor= color.new(color.rgb(0, 255, 8),70))    
    box.new(SC_bottom_up_mid, 0, SC_bottom_up_end, 9, xloc=xloc.bar_time, text=str.tostring(cycle_period_SC), border_color=color.new(#a1fbc1, 0), border_width=0, bgcolor=color.new(#a1fbc1, 70))
    box.new(SC_bottom_up_end, 0, SC_top_down_start, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0, bgcolor=color.new(color.rgb(0,255,8),70))
    box.new(SC_top_down_start, 0, SC_top_down_mid, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))
    box.new(SC_top_down_mid, 0, SC_top_down_end, 9, xloc=xloc.bar_time, border_color=color.new(#ff7d7d,70), border_width=0, bgcolor=color.new(#ff7d7d, 70))
    box.new(SC_top_down_end, 0, bottom_date_next_SC, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))

问题根源分析 #

1. Box数量超限被自动清理：TradingView对box组件有默认数量限制（默认50个），脚本未设置max_boxes_count参数。当重复次数≥5时，创建的box总数为5*(6+6)=60，超过默认上限，系统会自动删除最早创建的box。长周期的box时间更早，被优先删除，导致早期范围消失，看起来像是向右偏移。
2. 重复创建Box加剧问题：脚本在每个bar都会执行循环并重新创建所有box，导致box数量翻倍增长，进一步触发数量限制。

解决思路 #

1. 提高Box数量上限 #

在indicator()函数中添加max_boxes_count参数，设置足够大的值以容纳所有需要创建的box：

indicator('Calendar Days 2', max_labels_count = 500, max_boxes_count = 500, overlay = true)

2. 避免重复创建Box #

仅在最后一个bar创建所有box，避免每个bar重复执行创建逻辑，减少不必要的box数量：
修改脚本，将循环逻辑包裹在if barstate.islast条件中：

//@version=5
indicator('Calendar Days 2', max_labels_count = 500, max_boxes_count = 500, overlay = true)

// Inputs
anchor_date_DC = input.time(timestamp("01 Jan 2023 05:00"), "Anchor Date Bottom DC")
anchor_date_SC = input.time(timestamp("01 Jan 2023 05:00"), "Anchor Date Bottom SC")
cycle_period_DC = input.int(120, 'Cycle Period DC(Calendar Days)')
cycle_period_SC = input.int(50, 'Cycle Period SC (Calendar Days)')
number_dates = input.int(5, 'Number of Future Dates' )

// Conversions UNIX time
cycle_period_DC_unix = cycle_period_DC * 86400000
cycle_period_SC_unix = cycle_period_SC * 86400000

// 仅在最后一个bar执行创建逻辑
if barstate.islast
    bottom_date_DC = anchor_date_DC - cycle_period_DC_unix
    bottom_date_SC = anchor_date_SC - cycle_period_SC_unix

    for i = 1 to number_dates

        // Draw Dominant Cycle (DC)
        bottom_date_DC := bottom_date_DC + cycle_period_DC_unix

        DC_bottom_up_mid = int(bottom_date_DC + (cycle_period_DC_unix/100*12.5))
        DC_bottom_up_end = int(bottom_date_DC + (cycle_period_DC_unix/100*37.5))
        DC_top_down_start = bottom_date_DC + (cycle_period_DC_unix/100*50)
        DC_top_down_mid = int(bottom_date_DC + (cycle_period_DC_unix/100*62.5))
        DC_top_down_end = int(bottom_date_DC + (cycle_period_DC_unix/100*87.5))
        bottom_date_next_DC = bottom_date_DC + cycle_period_DC_unix

        box.new(bottom_date_DC, 10, DC_bottom_up_mid, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0,bgcolor= color.new(color.rgb(0, 255, 8),70))    
        box.new(DC_bottom_up_mid, 10, DC_bottom_up_end, 19, xloc=xloc.bar_time, text=str.tostring(cycle_period_DC), border_color=color.new(#a1fbc1, 0), border_width=0, bgcolor=color.new(#a1fbc1, 70))
        box.new(DC_bottom_up_end, 10, DC_top_down_start, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0, bgcolor=color.new(color.rgb(0,255,8),70))
        box.new(DC_top_down_start, 10, DC_top_down_mid, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))
        box.new(DC_top_down_mid, 10, DC_top_down_end, 19, xloc=xloc.bar_time, border_color=color.new(#ff7d7d, 70), border_width=0, bgcolor=color.new(#ff7d7d, 70))
        box.new(DC_top_down_end, 10, bottom_date_next_DC, 19, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))

        // Draw Secondary Cycle (SC)
        bottom_date_SC := bottom_date_SC + cycle_period_SC_unix

        SC_bottom_up_start = bottom_date_SC
        SC_bottom_up_mid = int(SC_bottom_up_start + (cycle_period_SC_unix/100*12.5))
        SC_bottom_up_end = int(SC_bottom_up_start + (cycle_period_SC_unix/100*37.5))
        SC_top_down_start = SC_bottom_up_start + (cycle_period_SC_unix/100*50)
        SC_top_down_mid = int(SC_bottom_up_start + (cycle_period_SC_unix/100*62.5))
        SC_top_down_end = int(SC_bottom_up_start + (cycle_period_SC_unix/100*87.5))
        bottom_date_next_SC = SC_bottom_up_start + cycle_period_SC_unix

        box.new(SC_bottom_up_start, 0, SC_bottom_up_mid, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0,bgcolor= color.new(color.rgb(0, 255, 8),70))    
        box.new(SC_bottom_up_mid, 0, SC_bottom_up_end, 9, xloc=xloc.bar_time, text=str.tostring(cycle_period_SC), border_color=color.new(#a1fbc1, 0), border_width=0, bgcolor=color.new(#a1fbc1, 70))
        box.new(SC_bottom_up_end, 0, SC_top_down_start, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(0,255,8),70), border_width=0, bgcolor=color.new(color.rgb(0,255,8),70))
        box.new(SC_top_down_start, 0, SC_top_down_mid, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))
        box.new(SC_top_down_mid, 0, SC_top_down_end, 9, xloc=xloc.bar_time, border_color=color.new(#ff7d7d,70), border_width=0, bgcolor=color.new(#ff7d7d, 70))
        box.new(SC_top_down_end, 0, bottom_date_next_SC, 9, xloc=xloc.bar_time, border_color=color.new(color.rgb(255,0,0),70), border_width=0, bgcolor=color.new(color.rgb(255,0,0),70))

3. 验证历史数据范围 #

如果调整后仍有问题，检查图表加载的历史数据是否覆盖了所有box的时间范围。可以手动在TradingView图表设置中增加历史数据加载天数，确保最早的box时间在加载范围内。

内容的提问来源于stack exchange，提问作者Adrian Stangell