## [0.8.1] - 2026-03-18 - Plugin System Refactor, Chart Patterns & Drawing Tool Improvements

[alaa-eddine]

[0.8.1] - 2026-03-18 - Plugin System Refactor, Chart Patterns & Drawing Tool Improvements

Added

• Plugin System Refactor: Each plugin now lives in its own folder (LineTool/, FibonacciTool/, MeasureTool/, etc.) with a dedicated DrawingRenderer class, tool class, and index.ts barrel. Key architectural changes:
  • New DrawingRenderer / DrawingRenderContext interfaces exported from types.ts — renderers receive typed pixel coordinates and selection state, returning an ECharts graphic element.
  • New DrawingRendererRegistry — maps drawing type strings to their renderer; plugins self-register on init.
  • DrawingType widened from a fixed union to string, allowing fully custom drawing types.
  • ChartContext gains registerDrawingRenderer() so plugins can extend the render pipeline.
  • New ToolGroup class — wraps multiple plugins into a single toolbar button with a chevron-indicator dropdown.
• Chart Pattern Tools: Seven new pattern tools, each with its own multi-point drawing renderer:
  • ABCDPatternTool — classic 4-point ABCD harmonic pattern
  • XABCDPatternTool — 5-point XABCD harmonic pattern
  • CypherPatternTool — Cypher harmonic pattern
  • HeadAndShouldersTool — Head & Shoulders / Inverse H&S
  • ThreeDrivesPatternTool — Three Drives pattern
  • TrianglePatternTool — Triangle (ascending / descending / symmetrical)
  • FibSpeedResistanceFanTool — Fibonacci Speed & Resistance Fan
• Fibonacci Channel Tool (FibonacciChannelTool): Multi-segment channel drawn from two anchor points with configurable Fibonacci levels.
• Fibonacci Trend Extension Tool (FibTrendExtensionTool): Three-point trend extension tool projecting Fibonacci price targets beyond the impulse move.
• Drawing Tool Point Snapping: Holding Ctrl while placing or dragging a drawing point snaps it to nearby OHLC levels on the closest candle. Implemented in AbstractPlugin and active across all drawing tools.

Fixed

• DataZoom Hidden Mode: When the DataZoom widget was configured with show: false, pan and zoom interactions stopped working entirely. Fixed by keeping the underlying event listeners active regardless of visibility.
• Empty Chart Title: Setting an empty string as the chart title now works correctly — previously an empty title was silently replaced with a default value.
• Drawing Editor Point Placement: Fixed a bug in DrawingEditor causing incorrect point snapping and state transitions when placing and editing multi-point drawing tools.