如何让PineScript绘制的线段仅显示10根K线且不被新线段删除

Issues with Your Current Code #

• Old Lines Get Deleted: You're reusing a single line_obj variable and deleting it each time a new line is created, so only the most recent line remains.
• Lines Extend Infinitely: The extend=extend.right parameter makes lines stretch to the right indefinitely.

Corrected Code #

//@version=5
indicator("10-Bar Close Segments", overlay=true)

// Initialize a persistent array to store all line objects
var line[] lineCollection = array.new_line()

// Create a new line every 10 bars (once we have enough historical data)
if bar_index % 10 == 0 and bar_index >= 10
    // Draw line between the close 10 bars ago and current close, no extension
    newLine = line.new(
        x1=bar_index - 10, y1=close[10],
        x2=bar_index, y2=close,
        color=color.red, width=2,
        extend=extend.none
    )
    // Add the new line to our collection to keep it from being deleted
    array.push(lineCollection, newLine)

Key Fixes Explained #

• Persistent Line Storage: Using a var array (lineCollection) ensures every new line is stored permanently—old lines aren't overwritten or deleted.
• Limited Line Length: Setting extend=extend.none restricts each line to exactly the 10-bar span between bar_index-10 and bar_index.
• Valid Data Check: The bar_index >=10 condition prevents trying to draw lines when there's no historical data for close[10].

This code will draw a new red line every 10 bars, connecting the close of the current bar to the close 10 bars prior. All lines remain visible on the chart, each spanning exactly 10 bars with no infinite extension.

内容的提问来源于stack exchange，提问作者Foenkelito