Building a Trading Chart Library for Candles, Lines, and Flags

Summary

This template explains how to build a live trading chart around candle, line, flag, and horizontal-level series. It organizes chart settings and series in shared state, then exposes functions for adding or updating records, plotting labeled data points, placing flags on a candle series, drawing horizontal reference levels, and changing chart titles. The example loop retrieves market records and ticker data, updates the display, and pauses between refreshes.

The implementation distinguishes a new bar from an update to the current bar by comparing timestamps. It applies a similar timestamp check to line points and flags, replacing the latest point or marker when the time matches. The text is an implementation walkthrough for chart presentation rather than a trading strategy: it does not define entry or exit rules, evaluate signals, or report backtest evidence. Its usefulness depends on the chart API and data structures described by the template, and the example’s polling pattern does not establish execution suitability or charting performance in other environments.

Key ideas

• A shared configuration and series array hold chart options and plotted data.\nTimestamp comparisons distinguish a new candle from an update to the current candle.\nSeparate plotting functions add candles, labeled lines, flags, horizontal levels, and titles.\nThe example refresh loop reads market records and ticker data before updating the chart.\nThe template demonstrates visualization plumbing and provides no tested trading rules or performance evidence.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.