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Indicators

ATR Trailing Stop (Pine Script Port) - indicator for MetaTrader 5

Usama Bin Islam
Usama Bin Islam

Usama Bin Islam

MQL5 developer: Expert Advisors from written rules, indicator development, Pine Script to MQL5 conversions, and cost-aware backtesting.
How I work:
- I turn your rules into a short written spec (entries, exits, stops, sizing, filters) before writing any code, so we agree on the logic first.
2 codes
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ATR Trailing Stop (Pine Script port)


A worked example of converting a TradingView Pine Script indicator to MQL5, kept in parity with a Python reference implementation.


Rules (same in all three versions):

- nLoss = ATR multiplier x SMA of true range over InpATRLength bars

- The stop ratchets up under price while price stays above it, and down over price while price stays below it

- The stop flips to the other side, and an arrow is drawn, when price closes through it


Pine to MQL5/Python translation notes (the actual porting work):

- ta.tr(true): the first bar has no previous close, so true range there is just high minus low

- ta.sma(x, n): stays na until n bars exist (first valid value at bar n-1)

- nz(stop[1], src): the previous stop, or the current price while the previous stop is still na

- var float stop = na: state carried from bar to bar, translated to a persistent buffer in MQL5 and a running array in Python

- ta.crossover / ta.crossunder: strictly false while either side is na, which matters for the first valid bar


Repository (Pine source, Python port with a literal bar-by-bar reference implementation for cross-checking, and a parity test comparing both to the MQL5 output): github.com/RAo797bit/pine-python-mql5-conversion


Compiles clean in MetaEditor with 0 errors, 0 warnings ATR trailing stop on a synthetic price series.

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