我在Google地图上绘制了三个多边形,第一个在第二个,第二个在第三个.
我想在javascript中将它们减去另一种形状.

P3-P2？
P2-P1？

解决方法:

我想的更容易：

var poly1Area = google.maps.geometry.spherical.computeArea(poly1.getPath());
var poly2Area = google.maps.geometry.spherical.computeArea(poly2.getPath());
var poly3Area = google.maps.geometry.spherical.computeArea(poly3.getPath());

poly2Area = poly2Area - poly1Area;
poly3Area = poly3Area - poly2Area;

ref：https://developers.google.com/maps/documentation/javascript/reference?csw=1#spherical