您好,
2.可以实现,绘制面的操作参考范例http://support.supermap.com.cn:8090/webgl/examples/editor.html#drawHandler,或者直接构造面实体对象(Entity)
3.可以,构造面实体的时候设置clampToS3M: true
范例代码:var region = viewer.entities.add(new Cesium.Entity({
polygon: new Cesium.PolygonGraphics({
hierarchy: Cesium.Cartesian3.fromDegreesArray([116.4498083382989, 39.90540439945022,
116.44979232852756, 39.906705618392685,
116.45150065086875, 39.90652208168731,
116.45130690418412, 39.905318570932856
]),
material: Cesium.Color.RED,
}),
clampToS3M: true
}))
4.可以直接设置面实体的风格,代码如上