如何检查线是否是多边形？

Question

我在谷歌地图中有一个多边形。我希望线条保持在多边形的边界内。我当前的代码可以工作，但前提是多边形的形状简单，没有尖锐（凹）边。当有锋利边缘时，线条将越过边界：

这是代码：

var polyOptions = {
    strokeColor: 'red',
    strokeOpacity: 1.0,
    strokeWeight: 3,
    editable: true,
    zIndex:2
  };
  poly = new google.maps.Polyline(polyOptions);
  poly.setMap(map);
  bermudaTriangle.setMap(map);

  google.maps.event.addListener(map, 'click', addLatLng);
  google.maps.event.addListener(map, 'rightclick', drawPolygon);
}



  var bermudaTriangle = new google.maps.Polygon({
    strokeColor: 'orange',
    strokeOpacity: 0.8,
    strokeWeight: 2,
    fillColor: 'yellow',
    fillOpacity: 0.35,
    zIndex:1,
    clickable:false,
    editable:true

  });



function addLatLng(event) {

  var path = poly.getPath();

if(google.maps.geometry.poly.containsLocation(event.latLng, bermudaTriangle)){
  path.push(event.latLng);
  console.log(path);
}

}

function drawPolygon(event) {

  var path = bermudaTriangle.getPath();
  path.push(event.latLng);

}