t-from-xy

function tFromXY(ps: number[][], p: number[]): RootInterval[]

Defined in local-properties-to-t/t-from-xy.ts:30

Performs certified inversion, i.e. returns the t parameter value interval(s) for the given x and y coordinates on the specified bezier curve.

• Only t values in [0,1] are returned.

• see also [[closestPointOnBezier]] and [[closestPointOnBezierCertified]]

precondition: p must be exactly on the curve for the result to be certified

• certified here means no t value can be missed but (in rare cases) an extra 1 or 2 ts could be returned (e.g. for self-overlapping curves and when the point is exactly on the point of self-intersection of the curve)

Parameters:

Name	Type	Description
ps	number[][]	an order 0,1,2 or 3 bezier curve given as an ordered array of its control point coordinates, e.g. [[0,0], [1,1], [2,1], [2,0]]
p	number[]	a point, e.g. [1,2]