Module curves 

Bezier curve generators (quadratic and cubic).

Port of agg_curves.h / agg_curves.cpp — provides two algorithms for flattening Bezier curves into line segments:

• Incremental (Curve3Inc, Curve4Inc): forward-differencing, fast but less precise for extreme curvatures.
• Subdivision (Curve3Div, Curve4Div): recursive de Casteljau subdivision, adaptive and high-quality.

The facade types Curve3 and Curve4 delegate to either algorithm.

Also provides conversion functions: catrom_to_bezier, ubspline_to_bezier, hermite_to_bezier.

Structs

Curve3

Quadratic Bezier curve with selectable algorithm.

Curve4

Cubic Bezier curve with selectable algorithm.

Curve3Div

Recursive subdivision quadratic Bezier curve flattener.

Curve3Inc

Incremental quadratic Bezier curve flattener using forward differences.

Curve4Div

Recursive subdivision cubic Bezier curve flattener.

Curve4Inc

Incremental cubic Bezier curve flattener using forward differences.

Curve4Points

Eight control-point coordinates for a cubic Bezier curve.

Enums

CurveApproximationMethod

Algorithm selection for curve flattening.

Functions

catrom_to_bezier

Convert Catmull-Rom spline segment to cubic Bezier control points.

hermite_to_bezier

Convert Hermite spline segment to cubic Bezier control points.

ubspline_to_bezier

Convert uniform B-spline segment to cubic Bezier control points.