Porting a Pine Script Indicator to ATAS: What Actually Matters

An indicator that's been running reliably on TradingView for months now needs to work in ATAS too - for order flow and footprint charts that TradingView simply doesn't offer. The obvious expectation: take the Pine Script code and translate it to C#. In practice, that's not quite as simple as it sounds, for a straightforward reason.

Why it isn't a line-by-line translation

Pine Script is an interpreted, series-based language that handles a lot automatically in the background: time-series management, access to previous bars (e.g. via close[1]), built-in ta. functions. C# in the ATAS API, by contrast, is compiled, object-oriented, and event-driven - none of that happens automatically. Every data access, every lookback into historical values, and every piece of stored state has to be managed explicitly. That's exactly why a real reimplementation of the logic is needed, not a syntax swap.

Three spots where it gets technically demanding

• Multi-timeframe requests (request.security()): convenient and built-in on Pine Script, but a known source of repainting if not handled carefully. In ATAS, that multi-timeframe logic has to be built explicitly, without that built-in convenience
• Order logic (strategy.entry() / strategy.close()): the order and position management behind Pine Script strategies differs from the ATAS API's execution model - the call syntax doesn't translate directly, the underlying behavior has to be rebuilt
• Historical values & state: Pine Script manages series and lookback into previous bars automatically. In C#, that state has to be stored explicitly and updated on every new bar

Why backtest numbers can shift slightly after the port

Even a careful port can produce slightly different backtest results - due to differing handling of multi-timeframe data, different execution timing, or differences in the underlying data feeds between TradingView and ATAS. That's normal and not a sign of a flawed port. What matters is comparing the behavior on identical historical data, not matching a number to the decimal point.

What the porting process actually looks like

• Share the Pine Script source code - speeds things up considerably, but isn't required
• Without code, a precise description of the logic or a chart example with visible signals is often enough
• Analysis of the underlying logic rather than a pure line-by-line transfer
• Reimplementation as a native C# indicator or as a strategy via the ATAS API
• Side-by-side comparison against the original TradingView display on identical historical data
• Handover including an installation guide and free support for follow-up questions

In the end, what matters isn't how similar the code looks, but whether the ported indicator behaves exactly like the original on the chart - that's the standard every port has to be measured against.