export class PolygonUtil {
   //     function Point(x, y) {
   //    this.x = x;
   //    this.y = y;
   // }

   // function Region(points) {
   //    this.points = points || [];
   //    this.length = points.length;
   // }


   //    public area() {
   //    var area = 0,
   //       i,
   //       j,
   //       point1,
   //       point2;

   //    for (i = 0, j = this.length - 1; i < this.length; j = i, i++) {
   //       point1 = this.points[i];
   //       point2 = this.points[j];
   //       area += point1.x * point2.y;
   //       area -= point1.y * point2.x;
   //    }
   //    area /= 2;

   //    return area;
   // }


   //     public centroid = function() {
   //    var x = 0,
   //       y = 0,
   //       i,
   //       j,
   //       f,
   //       point1,
   //       point2;

   //    for (i = 0, j = this.length - 1; i < this.length; j = i, i++) {
   //       point1 = this.points[i];
   //       point2 = this.points[j];
   //       f = point1.x * point2.y - point2.x * point1.y;
   //       x += (point1.x + point2.x) * f;
   //       y += (point1.y + point2.y) * f;
   //    }

   //    f = this.area() * 6;

   //    return new Point(x / f, y / f);
   // }
}