多边形是一组Latlng点按照传入顺序连接而成的封闭图形，开发者可以通过Polygon设置多边形的位置、边框和填充颜色。

示例代码如下：

// 添加多边形覆盖物
let pathArr: LatLng[] = [
    new LatLng(39.9122, 116.2575),
    new LatLng(40.0191, 116.4624),
    new LatLng(39.913506, 116.4955)
];
 let opts:IPolygonOption = {
    points: pathArr,
    fillcolor:'#0f0',
    stroke: new Stroke({
        strokeWidth: 12,
        color: '#ff00dd',
        strokeStyle: SysEnum.StrokeStyle.SQUARE
    })
}
this.polygon = new Polygon(opts);
this.polygon.setPoints(pathArr);
this.polygon.setFillcolor('#f9f');
this.polygon.addEventListener(OverlayEvent.CLICK, () => {
    this.polygon?.setFillcolor('rgba(0,0,255,0.6)');
    promptAction.showToast({
        message: '点击多边形',
        duration: 2000,
    });
});
this.mapController.addOverlay(this.polygon);

AoiSearch.newInstance().requestAoi({
    latLngList: [new LatLng(40.070754, 116.324175)]
})
.then((res: AoiResult) => {
    if (res) {
        if (res.aoiList) {
            for (let item of res.aoiList) {
                if(item.polygon){
                    let aoi_poly = new Polygon({
                        points: item.polygon,
                        fillcolor: '#ff0000',
                        alpha: 0.5
                    })
                    this.mapController.addOverlay(aoi_poly)
                }

            }
        }
    }
})