How to calculate difference of condition close and current close for all occurences of the condition

Question

con = ta.barssince(ta.rsi(close, 14) > 20) == 1

var flag = false

if ta.barssince(ta.ema(close, 50) > ta.ema(close, 200)) == 1
    flag := true

if ta.barssince(ta.ema(close, 50) < ta.ema(close, 200)) == 1
    flag := false

var labels = array.new_label()
var conCloses = array.new_float()

if con
    array.unshift(labels, label.new(bar_index, close, ""))
    array.unshift(conClose, close)

if flag[1]
    var txt = 0.
    for conClose in conCloses
        txt := close - conClose

    for label in labels
        label.set_text(label, str.tostring(txt))

afterFlag = flag[1] and not flag

if afterFlag
    array.clear(labels)
    array.clear(conCloses)

I want to calculate the difference of the close of when the condition is met with the current close for all the occurence of the condition, and display it with a label. I tried using the same logic with the previous question I asked but only find myself struggling. Help would be appreciated.

Inserted a pic of what I'm trying to achieve.

Answer 1

If you would like the values to be updated on every tick you should set the label's text in the global scope, otherwise, the text will be updated only on the flag[1] occurrence and real-time price would be ignored.

The second for..in structure with labels in your script is using only the last value of the txt as it is executed after all iterations of the previous loop. You can use indexing in the for [index, element]..in structure to set the label's text:

//@version=5
indicator("myScript", overlay = true)

con = ta.barssince(ta.rsi(close, 14) > 20) == 1

var flag = false

if ta.barssince(ta.ema(close, 50) > ta.ema(close, 200)) == 1
    flag := true

if ta.barssince(ta.ema(close, 50) < ta.ema(close, 200)) == 1
    flag := false

var labels = array.new_label()
var conCloses = array.new_float()

if con
    array.unshift(labels, label.new(bar_index, close, "", color = color.new(color.blue, 80), style = label.style_label_up))
    array.unshift(conCloses, close)

var txt = 0.
for [i, conClose] in conCloses
    txt := conClose - close
    label.set_text(array.get(labels, i), str.tostring(txt))