js 矩形(不规则)中心点位置查找
作者:互联网
function getPolygonAreaCenter(points) { var sum_x = 0; var sum_y = 0; var sum_area = 0; var p1 = points[1]; for (var i = 2; i < points.length; i++) { p2 = points[i]; area = Area(points[0], p1, p2); sum_area += area; sum_x += (points[0].x + p1.x + p2.x) * area; sum_y += (points[0].y + p1.y + p2.y) * area; p1 = p2; } var xx = sum_x / sum_area / 3; var yy = sum_y / sum_area / 3; return { xx, yy }; } function Area(p0, p1, p2) { var area = 0.0; area = p0.x * p1.y + p1.x * p2.y + p2.x * p0.y - p1.x * p0.y - p2.x * p1.y - p0.x * p2.y; return area / 2; }
标签:p2,p1,area,sum,js,查找,中心点,var,points 来源: https://www.cnblogs.com/ZhaoMingYuan/p/16174490.html