Plot a shape on previous week's high in pinescript - plot

Question

Trying to plot a shape on the previous week's high, but having difficulty getting it to plot. Hope someone can help here
indicator("My script", overlay = true)
previousWeekHigh = request.security(syminfo.tickerid, 'W', high[1],lookahead=barmerge.lookahead_on, gaps = barmerge.gaps_off)
isNewWeek = timeframe.change("W")
anchor_point() =>
float anchor = na
if isNewWeek
anchor := previousWeekHigh
anchor
anchorBar = anchor_point()
plotshape(anchorBar, style=shape.xcross)```

Answer 1

You cannot really use the plotshape() for this purpose as the position of the weekly high bar will be dynamic.
I would just use two var variables, one for the price and one for the "bars since" count. You don't even need the security() here.
Here is an example:
//#version=5
indicator("My script", overlay=true)
is_new_week = ta.change(time("W"))
bgcolor(is_new_week ? color.new(color.blue, 85) : na)
var label weekly_high_lbl = label.new(na, na, "Weekly\nHigh", yloc=yloc.abovebar, style=label.style_label_down, color=color.green, textcolor=color.white)
var line weekly_high_line = line.new(na, na, na, na, extend=extend.right, color=color.green)
var float weekly_high_price = na
var int weekly_high_barssince = 0
if (is_new_week)
// Update the label and line first
label.set_xy(weekly_high_lbl, bar_index - weekly_high_barssince, weekly_high_price)
line.set_xy1(weekly_high_line, bar_index - weekly_high_barssince, weekly_high_price)
line.set_xy2(weekly_high_line, bar_index, weekly_high_price)
// Reset the variables
weekly_high_price := high
weekly_high_barssince := 0
else
// Check for new high
if (high >= weekly_high_price)
weekly_high_price := high
weekly_high_barssince := 1
else
weekly_high_barssince := weekly_high_barssince + 1 // Increase the counter