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DataFlow.js
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108 lines (98 loc) · 3.8 KB
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/* Copyright© 2000 - 2018 SuperMap Software Co.Ltd. All rights reserved.
* This program are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import ol from 'openlayers';
import {
DataFlowService
} from "../services/DataFlowService";
/**
* @class ol.source.DataFlow
* @category iServer DataFlow
* @classdesc 数据流图层源。
* @param {Object} opt_options - 参数。
* @param {string} [opt_options.idField = 'id'] - 要素属性中表示唯一标识的字段。
* @param {Array.<Object>} [opt_options.geometry] - 设置增添的几何要素对象数组。
* @param {Object} [opt_options.prjCoordSys] - 请求的地图的坐标参考系统。当此参数设置的坐标系统不同于地图的原有坐标系统时， 系统会进行动态投影，并返回动态投影后的地图瓦片。例如：{"epsgCode":3857}。
* @param {Object} [opt_options.excludeField] - 排除字段
* @extends {ol.source.Vector}
*/
export class DataFlow extends ol.source.Vector {
constructor(opt_options) {
var options = opt_options ? opt_options : {};
super(options);
this.idField = options.idField || 'id';
this.dataService = new DataFlowService(options.ws, {
geometry: options.geometry,
prjCoordSys: options.prjCoordSys,
excludeField: options.excludeField
}).initSubscribe();
var me = this;
me.dataService.on('subscribeSocketConnected', function (e) {
me.dispatchEvent({
type: "subscribeSuccessed",
value: e
})
});
me.dataService.on('messageSuccessed', function (msg) {
me._onMessageSuccessed(msg);
});
me.dataService.on('setFilterParamSuccessed', function (msg) {
me.dispatchEvent({
type: "setFilterParamSuccessed",
value: msg
})
});
this.featureCache = {};
}
/**
* @function ol.source.DataFlow.prototype.setPrjCoordSys
* @description 设置坐标参考系。
* @param {Object} prjCoordSys - 参考系。
*/
setPrjCoordSys(prjCoordSys) {
this.dataService.setPrjCoordSys(prjCoordSys);
this.prjCoordSys = prjCoordSys;
return this;
}
/**
* @function ol.source.DataFlow.prototype.setExcludeField
* @description 设置唯一字段。
* @param {Object} excludeField - 排除字段。
*/
setExcludeField(excludeField) {
this.dataService.setExcludeField(excludeField);
this.excludeField = excludeField;
return this;
}
/**
* @function ol.source.DataFlow.prototype.setGeometry
* @description 设置几何图形。
* @param {Object} geometry - 要素图形。
*/
setGeometry(geometry) {
this.dataService.setGeometry(geometry);
this.geometry = geometry;
return this;
}
_onMessageSuccessed(msg) {
//this.clear();
var feature = (new ol.format.GeoJSON()).readFeature(msg.value.featureResult);
var geoID = feature.get(this.idField);
if (geoID !== undefined && this.featureCache[geoID]) {
this.featureCache[geoID].setGeometry(feature.getGeometry());
this.featureCache[geoID].setProperties(feature.getProperties());
this.changed();
} else {
this.addFeature(feature);
this.featureCache[geoID] = feature;
}
this.dispatchEvent({
type: "dataupdated",
value: {
source: this,
data: feature
}
})
}
}
ol.source.DataFlow = DataFlow;