How to calculate polygon centroid in JavaScript

This article mainly introduces the method of calculating the centroid of polygons using JavaScript, and analyzes the relevant operating techniques of JavaScript for the mathematical calculation of the centroid of polygons in the form of examples. Friends in need can refer to it

The examples in this article describe JavaScript Implement a method for calculating the centroid of a polygon. Share it with everyone for your reference, the details are as follows:

Recently, I want to display the annotation of polygons based on Baidu Map, so I studied the calculation of the centroid of Polygon. The code is as follows:

function Area(p0,p1,p2)
{
  var area = 0.0 ;
  area = p0.lng * p1.lat + p1.lng * p2.lat + p2.lng * p0.lat - p1.lng * p0.lat - p2.lng * p1.lat - p0.lng * p2.lat;
  return area / 2 ;
}
//line 249 计算polygon的质心
function getPolygonAreaCenter(points) {
  var sum_x = 0;
  var sum_y = 0;
  var sum_area = 0;
  var p1 = points[1];
  debugger;
  for (var i = 2; i < points.length; i++) {
    p2=points[i];
    area = Area(points[0],p1,p2) ;
    sum_area += area ;
    sum_x += (points[0].lng + p1.lng + p2.lng) * area;
    sum_y += (points[0].lat + p1.lat + p2.lat) * area;
    p1 = p2 ;
  }
  var xx = sum_x / sum_area / 3;
  var yy = sum_y / sum_area / 3;
  return new BMap.Point(xx, yy);
}

The effect of annotating text As follows:

#The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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