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35 lines
1.0 KiB
TypeScript
35 lines
1.0 KiB
TypeScript
export interface ISplinePoint {
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x: number;
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y: number;
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}
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/**
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* Props to Rob Spencer at scaled innovation for his post on splining between points
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* http://scaledinnovation.com/analytics/splines/aboutSplines.html
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*/
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export function splineCurve(
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firstPoint: ISplinePoint & { skip?: boolean },
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middlePoint: ISplinePoint,
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afterPoint: ISplinePoint,
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t: number
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): {
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previous: ISplinePoint;
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next: ISplinePoint;
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};
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export interface IMonotoneSplinePoint extends ISplinePoint {
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skip: boolean;
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controlPointPreviousX?: number;
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controlPointPreviousY?: number;
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controlPointNextX?: number;
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controlPointNextY?: number;
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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 function splineCurveMonotone(points: readonly IMonotoneSplinePoint[]): void;
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