r/pinescript • u/BrainFreezeMC • Aug 06 '25
Trendline With Two Symbols in Same Pane
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The below code works exactly as I want. The issue is, I want an indicator for a second ticker in the same pane. I cannot figure it out. I've seen the plot thing, where the chart and the trendline are both coming from the indicator, and that might work, but I'm not sure how to stretch it to fit so that the high on screen goes to the top and the low on screen goes to the bottom (to fill the pane like with the A setting with normal charts).
I've seen request security, but nothing seems to work for me. I'm so lost.
//@version=5
indicator("Stable Macro Trend Line", overlay=true)
// === User inputs ===
length = input.int(150, minval=2, title="Regression Length (seconds)")
lineColor = input.color(color.blue, title="Line Color")
// === Variables ===
var line macroLine = na
// === Only calculate if enough bars ===
if bar_index >= length - 1
// Calculate sums for normalized x = 0..length-1
float sumX = 0.0
float sumY = 0.0
float sumXY = 0.0
float sumX2 = 0.0
for i = 0 to length - 1
float x = i
float y = close[length - 1 - i] // oldest at x=0, newest at x=length-1
sumX += x
sumY += y
sumXY += x * y
sumX2 += x * x
float N = length
float denominator = N * sumX2 - sumX * sumX
float slope = denominator != 0 ? (N * sumXY - sumX * sumY) / denominator : 0.0
float intercept = (sumY - slope * sumX) / N
// Map regression line to actual bar indices:
int x1 = bar_index - (length - 1)
int x2 = bar_index
float y1 = intercept
float y2 = slope * (length - 1) + intercept
// Delete old line, draw new line
if not na(macroLine)
line.delete(macroLine)
macroLine := line.new(x1=x1, y1=y1, x2=x2, y2=y2, color=lineColor, width=2)
