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26 lines
977 B
TypeScript
26 lines
977 B
TypeScript
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import type { ChartArea } from '../types/index.js';
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export interface SplinePoint {
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x: number;
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y: number;
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skip?: boolean;
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cp1x?: number;
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cp1y?: number;
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cp2x?: number;
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cp2y?: number;
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}
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export declare function splineCurve(firstPoint: SplinePoint, middlePoint: SplinePoint, afterPoint: SplinePoint, t: number): {
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previous: SplinePoint;
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next: SplinePoint;
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};
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/**
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* This function calculates Bézier control points in a similar way than |splineCurve|,
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* but preserves monotonicity of the provided data and ensures no local extremums are added
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* between the dataset discrete points due to the interpolation.
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* See : https://en.wikipedia.org/wiki/Monotone_cubic_interpolation
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*/
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export declare function splineCurveMonotone(points: SplinePoint[], indexAxis?: 'x' | 'y'): void;
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/**
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* @private
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*/
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export declare function _updateBezierControlPoints(points: SplinePoint[], options: any, area: ChartArea, loop: boolean, indexAxis: 'x' | 'y'): void;
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