Method parseGeometry

src/common/format/GeoJSON.js:712–746

* @function GeoJSONFormat.prototype.parseGeometry * @description 将一个 GeoJSON 中的几何要素转化成 Geometry 对象。 * @param {GeoJSONObject} obj - 从 GeoJSON 对象中创建一个对象。 * @returns {Geometry} 一个几何要素。 * @private

(obj)

     * @private
     */
    parseGeometry(obj) {
        if (obj == null) {
            return null;
        }
        var geometry;
        if (obj.type == "GeometryCollection") {
            if (!(Util.isArray(obj.geometries))) {
                throw "GeometryCollection must have geometries array: " + obj;
            }
            var numGeom = obj.geometries.length;
            var components = new Array(numGeom);
            for (var i = 0; i < numGeom; ++i) {
                components[i] = this.parseGeometry.apply(
                    this, [obj.geometries[i]]
                );
            }
            geometry = new Collection(components);
        } else {
            if (!(Util.isArray(obj.coordinates))) {
                throw "Geometry must have coordinates array: " + obj;
            }
            if (!this.parseCoords[obj.type.toLowerCase()]) {
                throw "Unsupported geometry type: " + obj.type;
            }
            try {
                geometry = this.parseCoords[obj.type.toLowerCase()].apply(
                    this, [obj.coordinates]
                );
            } catch (err) {
                // deal with bad coordinates
                throw err;
            }
        }
        return geometry;
    }


    /**