Method write

src/common/format/WKT.js:308–332

* @function WKTFormat.prototype.write * @description 将矢量要素或矢量要素数组序列化为 WKT 字符串。 * @param {(FeatureVector|Array)} features - 矢量要素或矢量要素数组。 * @returns {string} 表示几何的 WKT 字符串。

(features)

     * @returns {string} 表示几何的 WKT 字符串。
     */
    write(features) {
        var collection, geometry, isCollection;
        if (features.constructor === Array) {
            collection = features;
            isCollection = true;
        } else {
            collection = [features];
            isCollection = false;
        }
        var pieces = [];
        if (isCollection) {
            pieces.push('GEOMETRYCOLLECTION(');
        }
        for (var i = 0, len = collection.length; i < len; ++i) {
            if (isCollection && i > 0) {
                pieces.push(',');
            }
            geometry = collection[i].geometry;
            pieces.push(this.extractGeometry(geometry));
        }
        if (isCollection) {
            pieces.push(')');
        }
        return pieces.join('');
    }

    /**
     * @function WKTFormat.prototype.extractGeometry