支持在给定的点上定位的平面的分解的数据结构。

The goal is to build a data structure for a decomposition of the plane that supports to locate the face containing a given point. The running program should support the following operations. Read a DCEL from a file (constructed in Project 1) representing a decomposition of the plane. Input a query point interactively by using the mouse, and highlighting the face containing the query point. A running program implementing one of the planar point location data structures in [BKOS, Chapter 6] or ST86 is expected.