Vue计算的属性不会更新对象文字

Question

我正在构建一个GeoJSON编辑器，该编辑器在 vue2-google-maps 中显示预览。挑战之一是将GeoJSON的coordinates转换为LatLngLiteral，以用作<GmapMarker>，<GmapPolygon>或<GmapPolyline>中的道具。我的解决方案是使用计算属性。因此，当更改GeoJSON时，地图对象也将更改。像这样：

computed: {
    mapObject() {

        // If the geometry is a point, just assign geometry.coordinates into `lat` and `lng`
        if (this.$data.geometry.type === "Point") return ({
            lat: this.$data.geometry.coordinates[1],
            lng: this.$data.geometry.coordinates[0],
        });

        // If it's a polygon, grab the first set of coordinates (we aren't supporting polygons with holes for now).
        // then splice off the last element (Google Maps' polygon automatically loop the shape, unlike GeoJSON's convention),
        // then we map the values into an array of LatLngLiterals.
        if (this.$data.geometry.type === "Polygon") return this.$data.geometry.coordinates[0].splice(-1, 1).map(e => ({lat: e[1], lng: e[0]}));

        // If it's a LineString, do as above, without the splicing.
        if (this.$data.geometry.type === "LineString") return this.$data.geometry.coordinates.map(e => ({lat: e[1], lng: e[0]}));
    }
},

问题是，这不会针对Point类型进行更新。不过，对于Polygon和LineString类型，这似乎工作正常。任何帮助将不胜感激。