Method getStyleByData

src/mapboxgl/overlay/UniqueThemeLayer.js:76–108

* @private * @function UniqueThemeLayer.prototype.getStyleByData * @description 通过数据获取 style。 * @param {Object} fea - 要素数据。

(fea)

     * @param {Object} fea - 要素数据。
     */
    getStyleByData(fea) {
        var style = {};
        var feature = fea;
        style = CommonUtil.copyAttributesWithClip(style, this.style);
        if (this.themeField && this.styleGroups && this.styleGroups.length > 0 && feature.attributes) {
            var tf = this.themeField;
            var Attrs = feature.attributes;
            var Gro = this.styleGroups;
            var isSfInAttrs = false; //指定的 themeField 是否是 feature 的属性字段之一
            var attr = null; //属性值
            for (var property in Attrs) {
                if (tf === property) {
                    isSfInAttrs = true;
                    attr = Attrs[property];
                    break;
                }
            }
            //判断属性值是否属于styleGroups的某一个范围，以便对获取分组 style
            if (isSfInAttrs) {
                for (var i = 0, len = Gro.length; i < len; i++) {
                    if ((attr).toString() === ( Gro[i].value).toString()) {
                        //feature.style = CommonUtil.copyAttributes(feature.style, this.defaultStyle);
                        var sty1 = Gro[i].style;
                        style = CommonUtil.copyAttributesWithClip(style, sty1);
                    }
                }
            }
        }
        if (feature.style && this.isAllowFeatureStyle === true) {
            style = CommonUtil.copyAttributesWithClip(feature.style);
        }
        return style;
    }

}