iCurve

iCurve brings Boolean operations to paths made from straight lines, quadratic and cubic Bézier curves, and elliptic arcs.

Unlike a polygon-only workflow, the result retains curve segments. A result can be rendered or serialized as JavaScript data, or passed directly to another operation as reusable CurveGeometry.

Features

• Curve segments: lines, quadratic and cubic Bézier curves, and elliptic arcs.
• Boolean operations: union, intersection, difference, inverse difference, and exclusion.
• Self-intersection resolving: apply a fill rule to a subject without a clip.
• Reusable geometry: chain operations without converting the result through JavaScript objects.
• Controlled approximation: tune curve subdivision when the default settings are not suitable for the input scale.
• Conversion diagnostics: detect contours or segments that collapse in the discrete precision model.

Workflow

1. Build each closed shape with CurveBuilder.
2. Create a CurveOverlay from the subject and clip geometry.
3. Apply an OverlayRule and FillRule.
4. Keep the returned CurveGeometry for another operation, or call toData() for rendering and serialization.

See Getting Started for a complete example and API Reference for the available methods and output types.

Interactive Demos

• Boolean Playground — edit curve shapes and their control points by hand.
• Curve Motion Lab — animate many cubic contours while measuring Boolean solve time and frame rate.
• TypeCurve — run operations on editable font outlines.

Source Code

• Rust Version: iShape-Rust/iCurve
• JavaScript and WebAssembly bindings: iShape-Rust/iShape-js