Method onAdd

src/mapboxgl/overlay/DeckglLayer.js:89–119

* @function DeckglLayer.prototype.onAdd * @param {mapboxgl.Map} map - MapBoxGL Map 对象。 * @returns {DeckglLayer}

(map)

     * @returns {DeckglLayer}
     */
    onAdd(map) {
        this.map = map;
        if (this.canvas) {
            this.mapContainer = this.map.getCanvasContainer();
            return this;
        }
        //当使用扩展的mapboxgl代码时有效
        if (this._isEPSG3857()) {
            this.coordinateSystem = 3;
            this.isGeographicCoordinateSystem = true;
        } else {
            this.coordinateSystem = 1;
            this.isGeographicCoordinateSystem = false;
        }
        //创建图层容器
        this._initContainer(this.map.getCanvasContainer(), this.map.getCanvas());

        //创建 deckgl 图层
        this._createLayerByLayerTypeID();

        var mapState = this._getState();
        let deckOptions = {};
        for (let key in mapState) {
            deckOptions[key] = mapState[key];
        }
        deckOptions.layers = [this.layer];
        deckOptions.canvas = this.canvas;
        this.deckGL = new window.DeckGL.experimental.DeckGLJS(deckOptions);
        this._draw();
        return this;
    }

    /**
     * @function DeckglLayer.prototype.onRemove