@antv/util/src/path/util/mid-point.ts

> AntV 底层依赖的工具库，不建议在自己业务中使用。

export function midPoint(a: number[], b: number[], t: number) {
  const ax = a[0];
  const ay = a[1];
  const bx = b[0];
  const by = b[1];
  return [ax + (bx - ax) * t, ay + (by - ay) * t];
}