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Library Architecture

Spline is structured around a small set of geometry responsibilities that can be reused without any Avalonia dependency.

Core building blocks

  • Vec2 provides the package's basic 2D vector type.
  • MathUtils and Polynomial support low-level numerical operations.
  • CubicBezier and TwoCubics model Bezier control geometry and segment transformations.
  • BezierPath represents rendered output as commands and also supports distance-based hit testing.
  • Spline, TwoParamCurve, MyCurve, and TwoParamSpline form the spline solving and rendering pipeline.
  • CurveGrid stores an interpolated grid of curve masters for the tuner workflow.
  • PolylineUtils provides headless simplification and resampling utilities for converting traced input into spline control points.

Separation of concerns

The package intentionally excludes:

  • windowing and view logic
  • app settings persistence
  • input handling and editing UX
  • file-picker and rendering-surface integration

Those responsibilities stay in samples/DemoSpline, which acts as the interactive host for the library.

Typical consumer flow

Most consumers only need to:

  1. create Spline.CP control points
  2. construct a Spline
  3. call Solve()
  4. optionally call ComputeCurvatureBlending()
  5. render via Render() or RenderSvg()