* @function Theme.prototype.removeFeatures * @param {(Array. |FeatureVector|Function)} features - 要删除要素的数组或用来过滤的回调函数。 * @description 从专题图中删除要素。这个函数删除所有传递进来的矢量要素。 * 参数中的要素数组中的每一项，必须是已经添加到当前图层中的要素， * 如果无法确定要素数组，则可以调用 removeAllFeatures 来删除所有要素
(features)
| 209 | * 删除所有要素后再重新添加。这样效率会更高。 |
| 210 | */ |
| 211 | removeFeatures(features) { |
| 212 | var me = this; |
| 213 | if (!features) { |
| 214 | return; |
| 215 | } |
| 216 | if (features === me.features) { |
| 217 | return me.removeAllFeatures(); |
| 218 | } |
| 219 | if (!CommonUtil.isArray(features) && !(typeof features === 'function')) { |
| 220 | features = [features]; |
| 221 | } |
| 222 | |
| 223 | var featuresFailRemoved = []; |
| 224 | |
| 225 | for (var i = 0; i < me.features.length; i++) { |
| 226 | var feature = me.features[i]; |
| 227 | |
| 228 | //如果我们传入的feature在features数组中没有的话，则不进行删除， |
| 229 | //并将其放入未删除的数组中。 |
| 230 | if (features && typeof features === 'function') { |
| 231 | if (features(feature)) { |
| 232 | me.features.splice(i--, 1); |
| 233 | } |
| 234 | } else { |
| 235 | var findex = CommonUtil.indexOf(features, feature); |
| 236 | if (findex === -1) { |
| 237 | featuresFailRemoved.push(feature); |
| 238 | } else { |
| 239 | me.features.splice(i--, 1); |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | var drawFeatures = []; |
| 244 | for (var hex = 0, len = this.features.length; hex < len; hex++) { |
| 245 | feature = this.features[hex]; |
| 246 | drawFeatures.push(feature); |
| 247 | } |
| 248 | this.features = []; |
| 249 | this.addFeatures(drawFeatures); |
| 250 | //绘制专题要素 |
| 251 | if (this.renderer) { |
| 252 | this.redrawThematicFeatures(this.map.getView().calculateExtent()); |
| 253 | } |
| 254 | var succeed = featuresFailRemoved.length == 0 ? true : false; |
| 255 | this.dispatchEvent({type: "featuresremoved", value: {features: featuresFailRemoved, succeed: succeed}}); |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * @function Theme.prototype.removeAllFeatures |
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