All files / src/utils snap.ts

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export const snap = (points: number | number[]) => {
  if (typeof points === 'number') {
    return (v: number) => Math.round(v / points) * points;
  } else {
    let i = 0;
    const numPoints = points.length;
 
    return (v: number) => {
      let lastDistance = Math.abs(points[0] - v);
 
      for (i = 1; i < numPoints; i++) {
        const point = points[i];
        const distance = Math.abs(point - v);
 
        if (distance === 0) return point;
 
        if (distance > lastDistance) return points[i - 1];
 
        if (i === numPoints - 1) return point;
 
        lastDistance = distance;
      }
    };
  }
};