@mlightcad/libredwg-web/lib/svg/util/toPiecewiseBezier.js

A DWG/DXF JavaScript parser based on libredwg

export const toPiecewiseBezier = (k, controlPoints, knots) => {
    const piecewise = { knots: [], controlPoints: [] };
    let controlPointIndex = 0;
    let knotIndex = k;
    while (knotIndex < knots.length - k + 1) {
        const m = multiplicity(knots, knotIndex);
        const cp = controlPoints.slice(controlPointIndex, controlPointIndex + k);
        piecewise.knots.push(...knots.slice(knotIndex, knotIndex + m));
        piecewise.controlPoints.push(...cp);
        controlPointIndex += m;
        knotIndex += m;
    }
    return piecewise;
};
export const multiplicity = (knots, index) => {
    let count = 0;
    const knotValue = knots[index];
    while (index < knots.length && knots[index] === knotValue) {
        count++;
        index++;
    }
    return count;
};
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