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- import type { ChartArea } from '../types/index.js';
- import type { SplinePoint } from '../types/geometric.js';
- export declare function splineCurve(firstPoint: SplinePoint, middlePoint: SplinePoint, afterPoint: SplinePoint, t: number): {
- previous: SplinePoint;
- next: SplinePoint;
- };
- /**
- * This function calculates Bézier control points in a similar way than |splineCurve|,
- * but preserves monotonicity of the provided data and ensures no local extremums are added
- * between the dataset discrete points due to the interpolation.
- * See : https://en.wikipedia.org/wiki/Monotone_cubic_interpolation
- */
- export declare function splineCurveMonotone(points: SplinePoint[], indexAxis?: 'x' | 'y'): void;
- /**
- * @private
- */
- export declare function _updateBezierControlPoints(points: SplinePoint[], options: any, area: ChartArea, loop: boolean, indexAxis: 'x' | 'y'): void;
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