求助：获取指定时段内前一日的HH、LL及收盘价（Pine Script）

原代码存在的问题 #

• 硬编码时段时间，未使用用户输入的first_session/second_session参数，且未指定IST时区，导致时段判断不准确
• 使用var声明的变量不会每日重置，跨天数据会累积，无法正确分离当日与前一日的高低点
• 未实现前一日时段数据的存储逻辑，也未跟踪指定时段的收盘价

修正后的代码 #

//@version=5
indicator("Previous Day Session High/Low/Close", overlay=true, timezone="Asia/Kolkata")

// 用户自定义时段（IST时区）
first_session = input.session("0915-1225", title="First Trading Session")
second_session = input.session("1230-1530", title="Second Trading Session")

// 检测是否处于指定时段（使用输入的session参数+IST时区）
is_in_first_session = time(timeframe.period, first_session, "Asia/Kolkata") != na
is_in_second_session = time(timeframe.period, second_session, "Asia/Kolkata") != na

// 变量声明：区分当日和前一日的时段数据
var float current_first_high = na
var float current_first_low = na
var float current_first_close = na
var float current_second_high = na
var float current_second_low = na
var float current_second_close = na

var float prev_first_high = na
var float prev_first_low = na
var float prev_first_close = na
var float prev_second_high = na
var float prev_second_low = na
var float prev_second_close = na

// 检测新交易日（每日开盘时触发）
new_day = ta.change(time("D"))

// 新交易日时：保存前一日数据，重置当日数据
if new_day
    // 保存前一日的时段数据
    prev_first_high := current_first_high
    prev_first_low := current_first_low
    prev_first_close := current_first_close
    prev_second_high := current_second_high
    prev_second_low := current_second_low
    prev_second_close := current_second_close
    
    // 重置当日数据
    current_first_high := na
    current_first_low := na
    current_first_close := na
    current_second_high := na
    current_second_low := na
    current_second_close := na

// 跟踪第一时段的当日高低点及收盘价
if is_in_first_session
    current_first_high := na(current_first_high) ? high : math.max(current_first_high, high)
    current_first_low := na(current_first_low) ? low : math.min(current_first_low, low)
    current_first_close := close  // 实时更新为当前时段的最新收盘价

// 跟踪第二时段的当日高低点及收盘价
if is_in_second_session
    current_second_high := na(current_second_high) ? high : math.max(current_second_high, high)
    current_second_low := na(current_second_low) ? low : math.min(current_second_low, low)
    current_second_close := close  // 实时更新为当前时段的最新收盘价

// 绘制前一日时段的高低点水平线
var line prev_first_high_line = na
var line prev_first_low_line = na
var line prev_second_high_line = na
var line prev_second_low_line = na

if new_day
    // 删除旧的水平线
    line.delete(prev_first_high_line)
    line.delete(prev_first_low_line)
    line.delete(prev_second_high_line)
    line.delete(prev_second_low_line)
    
    // 绘制新的前一日时段高低线
    prev_first_high_line := line.new(bar_index, prev_first_high, bar_index + 100, prev_first_high, color=color.new(color.green, 0), width=2, style=line.style_dashed)
    prev_first_low_line := line.new(bar_index, prev_first_low, bar_index + 100, prev_first_low, color=color.new(color.red, 0), width=2, style=line.style_dashed)
    prev_second_high_line := line.new(bar_index, prev_second_high, bar_index + 100, prev_second_high, color=color.new(color.blue, 0), width=2, style=line.style_dashed)
    prev_second_low_line := line.new(bar_index, prev_second_low, bar_index + 100, prev_second_low, color=color.new(color.orange, 0), width=2, style=line.style_dashed)

// 最后一根K线显示前一日数据标签
if barstate.islast
    label_text = str.format("前一日第一时段:\n高点: {0}\n低点: {1}\n收盘价: {2}\n\n前一日第二时段:\n高点: {3}\n低点: {4}\n收盘价: {5}", 
         prev_first_high, prev_first_low, prev_first_close,
         prev_second_high, prev_second_low, prev_second_close)
    label.new(bar_index + 2, hl2, style=label.style_label_upper_right, color=color.new(color.yellow, 70), size=size.large, text=label_text)

关键修改说明 #

1. 时区与时段处理：指定timezone="Asia/Kolkata"（IST时区），使用time()函数结合用户输入的session参数判断时段，替代原硬编码的时间逻辑，确保时段判断准确。
2. 数据分离与重置：用new_day检测交易日切换，将当日数据与前一日数据分离，每日开盘时保存前一日数据并重置当日变量，避免跨天数据累积。
3. 收盘价跟踪：新增current_first_close/current_second_close变量，实时更新指定时段的收盘价，并在新交易日时保存为前一日收盘价。
4. 可视化优化：添加前一日时段高低点的虚线绘制，方便直观查看，同时优化标签文本格式，清晰展示所有需要的数据。

内容的提问来源于stack exchange，提问作者user10286