Method extend

src/common/commontypes/Bounds.js:317–352

* @function Bounds.prototype.extend * @description 在当前 bounds 上扩展 bounds，支持 point，lonlat 和 bounds。扩展后的 bounds 的范围是两者的结合。 * @example * var bounds1 = new Bounds(-50,-50,40,40); * //bounds 改变 * bounds.extend(new LonLat(50,60)); * @param {GeometryPoint|LonLat|Bounds} object

(object)

     * @param {GeometryPoint|LonLat|Bounds} object - 可以是 point、lonlat 和 bounds。
     */
    extend(object) {
        var bounds = null;
        if (object) {
            // clear cached center location
            switch (object.CLASS_NAME) {
                case "SuperMap.LonLat":
                    bounds = new Bounds(object.lon, object.lat,
                        object.lon, object.lat);
                    break;
                case "SuperMap.Geometry.Point":
                    bounds = new Bounds(object.x, object.y,
                        object.x, object.y);
                    break;

                case "SuperMap.Bounds":
                    bounds = object;
                    break;
            }

            if (bounds) {
                this.centerLonLat = null;
                if ((this.left == null) || (bounds.left < this.left)) {
                    this.left = bounds.left;
                }
                if ((this.bottom == null) || (bounds.bottom < this.bottom)) {
                    this.bottom = bounds.bottom;
                }
                if ((this.right == null) || (bounds.right > this.right)) {
                    this.right = bounds.right;
                }
                if ((this.top == null) || (bounds.top > this.top)) {
                    this.top = bounds.top;
                }
            }
        }
    }

    /**
     * @function Bounds.prototype.containsLonLat