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Util.js
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/* Copyright© 2000 - 2020 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 {Unit, Bounds, GeoJSON as GeoJSONFormat, FilterParameter,
GetFeaturesBySQLParameters,
GetFeaturesBySQLService,
QueryBySQLParameters,
QueryOption
} from '@supermap/iclient-common';
import { QueryService } from '../services/QueryService';
import * as olUtil from 'ol/util';
/**
* @class ol.supermap.Util
* @category BaseTypes Util
* @classdesc 工具类。
*/
export class Util {
constructor() {
}
static getOlVersion(){
if(olUtil && olUtil.VERSION) {
return olUtil.VERSION.split('.')[0]
}
if(window && window.ol){
if(window.ol.util){
return '6'
}
if(window.ol.WebGLMap){
return '5'
}
}
return '4'
}
/**
* @function ol.supermap.Util.toGeoJSON
* @description 将传入对象转为 GeoJSON 格式。
* @param {Object} smObj - 待转参数。
*/
static toGeoJSON(smObj) {
if (smObj) {
var format = new GeoJSONFormat();
return format.toGeoJSON(smObj);
}
}
/**
* @function ol.supermap.Util.toSuperMapGeometry
* @description 将 GeoJSON 对象转为 SuperMap 几何图形。
* @param {GeoJSONObject} geoJSON - GeoJSON 对象。
*/
static toSuperMapGeometry(geoJSON) {
if (geoJSON && geoJSON.type) {
var format = new GeoJSONFormat();
var result = format.read(geoJSON, "FeatureCollection");
return result[0].geometry;
}
}
/**
* @function ol.supermap.Util.resolutionToScale
* @description 通过分辨率计算比例尺。
* @param {number} resolution - 分辨率。
* @param {number} dpi - 屏幕分辨率。
* @param {string} mapUnit - 地图单位。
* @returns {number} 比例尺。
*/
static resolutionToScale(resolution, dpi, mapUnit) {
var inchPerMeter = 1 / 0.0254;
// 地球半径。
var meterPerMapUnit = this.getMeterPerMapUnit(mapUnit);
var scale = resolution * dpi * inchPerMeter * meterPerMapUnit;
scale = 1 / scale;
return scale;
}
/**
* @function ol.supermap.Util.toSuperMapBounds
* @description 转为 SuperMapBounds 格式。
* @param {Array.<number>} bounds - bounds 数组。
* @returns {SuperMap.Bounds} 返回 SuperMap 的 Bounds 对象。
*/
static toSuperMapBounds(bounds) {
return new Bounds(
bounds[0],
bounds[1],
bounds[2],
bounds[3]
);
}
/**
* @function ol.supermap.Util.toProcessingParam
* @description 将 Region 节点数组转为 Processing 服务需要的分析参数。
* @param {Array} points - Region 各个节点数组。
* @returns processing 服务裁剪、查询分析的分析参数。
*/
static toProcessingParam(points) {
var geometryParam = {};
if (points.length < 1) {
geometryParam = "";
} else {
var results = [];
for (var i = 0; i < points.length; i++) {
var point = {};
point.x = points[i][0];
point.y = points[i][1];
results.push(point);
}
results.push(results[0]);
geometryParam.type = "REGION";
geometryParam.points = results;
}
return geometryParam;
}
/**
* @function ol.supermap.Util.scaleToResolution
* @description 通过比例尺计算分辨率。
* @param {number} scale - 比例尺。
* @param {number} dpi - 屏幕分辨率。
* @param {string} mapUnit - 地图单位。
* @returns {number} 分辨率。
*/
static scaleToResolution(scale, dpi, mapUnit) {
var inchPerMeter = 1 / 0.0254;
var meterPerMapUnitValue = this.getMeterPerMapUnit(mapUnit);
var resolution = scale * dpi * inchPerMeter * meterPerMapUnitValue;
resolution = 1 / resolution;
return resolution;
}
/**
* @private
* @function ol.supermap.Util.getMeterPerMapUnit
* @description 获取每地图单位多少米。
* @param {string} mapUnit - 地图单位。
* @returns {number} 返回每地图单位多少米。
*/
static getMeterPerMapUnit(mapUnit) {
var earchRadiusInMeters = 6378137;
var meterPerMapUnit;
if (mapUnit === Unit.METER) {
meterPerMapUnit = 1;
} else if (mapUnit === Unit.DEGREE) {
// 每度表示多少米。
meterPerMapUnit = Math.PI * 2 * earchRadiusInMeters / 360;
} else if (mapUnit === Unit.KILOMETER) {
meterPerMapUnit = 1.0E-3;
} else if (mapUnit === Unit.INCH) {
meterPerMapUnit = 1 / 2.5399999918E-2;
} else if (mapUnit === Unit.FOOT) {
meterPerMapUnit = 0.3048;
} else {
return meterPerMapUnit;
}
return meterPerMapUnit;
}
/**
* @function ol.supermap.Util.isArray
* @description 判断是否为数组格式。
* @param {Object} obj - 待判断对象。
* @returns {boolean} 是否是数组。
*/
static isArray(obj) {
return Object.prototype.toString.call(obj) == '[object Array]'
}
/**
* @function ol.supermap.Util.Csv2GeoJSON
* @description 将 csv 格式转为 GeoJSON。
* @param {Object} csv - csv 对象。
* @param {Object} options - 转换参数。
*/
static Csv2GeoJSON(csv, options) {
var defaultOptions = {
titles: ['lon', 'lat'],
latitudeTitle: 'lat',
longitudeTitle: 'lon',
fieldSeparator: ',',
lineSeparator: '\n',
deleteDoubleQuotes: true,
firstLineTitles: false
};
options = options || defaultOptions;
var _propertiesNames = []
if (typeof csv === 'string') {
var titulos = options.titles;
if (options.firstLineTitles) {
csv = csv.split(options.lineSeparator);
if (csv.length < 2) {
return;
}
titulos = csv[0];
csv.splice(0, 1);
csv = csv.join(options.lineSeparator);
titulos = titulos.trim().split(options.fieldSeparator);
for (let i = 0; i < titulos.length; i++) {
titulos[i] = _deleteDoubleQuotes(titulos[i]);
}
options.titles = titulos;
}
for (let i = 0; i < titulos.length; i++) {
var prop = titulos[i].toLowerCase().replace(/[^\w ]+/g, '').replace(/ +/g, '_');
if (prop == '' || prop == '_') {
prop = 'prop-' + i;
}
_propertiesNames[i] = prop;
}
csv = _csv2json(csv);
}
return csv;
function _deleteDoubleQuotes(cadena) {
if (options.deleteDoubleQuotes) {
cadena = cadena.trim().replace(/^"/, "").replace(/"$/, "");
}
return cadena;
}
function _csv2json(csv) {
var json = {};
json["type"] = "FeatureCollection";
json["features"] = [];
var titulos = options.titles;
csv = csv.split(options.lineSeparator);
for (var num_linea = 0; num_linea < csv.length; num_linea++) {
var campos = csv[num_linea].trim().split(options.fieldSeparator)
, lng = parseFloat(campos[titulos.indexOf(options.longitudeTitle)])
, lat = parseFloat(campos[titulos.indexOf(options.latitudeTitle)]);
var isInRange = lng < 180 && lng > -180 && lat < 90 && lat > -90;
if (!(campos.length == titulos.length && isInRange)) {
continue;
}
var feature = {};
feature["type"] = "Feature";
feature["geometry"] = {};
feature["properties"] = {};
feature["geometry"]["type"] = "Point";
feature["geometry"]["coordinates"] = [lng, lat];
for (var i = 0; i < titulos.length; i++) {
if (titulos[i] != options.latitudeTitle && titulos[i] != options.longitudeTitle) {
feature["properties"][_propertiesNames[i]] = _deleteDoubleQuotes(campos[i]);
}
}
json["features"].push(feature);
}
return json;
}
}
/**
* @function ol.supermap.Util.createCanvasContext2D
* @description 创建 2D 画布。
* @param {number} opt_width - 画布宽度。
* @param {number} opt_height - 画布高度。
*/
static createCanvasContext2D(opt_width, opt_height) {
var canvas = document.createElement('CANVAS');
if (opt_width) {
canvas.width = opt_width;
}
if (opt_height) {
canvas.height = opt_height;
}
return canvas.getContext('2d');
}
/**
* @function ol.supermap.Util.supportWebGL2
* @description 是否支持 webgl2。
*/
static supportWebGL2() {
var canvas = document.createElement('canvas');
return Boolean(canvas && canvas.getContext("webgl2"));
}
/**
* @function ol.supermap.Util.isString
* @description 是否为字符串
* @param {string} str - 需要判断的内容
* @returns {boolean}
*/
static isString(str) {
return (typeof str === 'string') && str.constructor === String;
}
/**
* @function ol.supermap.Util.trim
* @description 字符串裁剪两边的空格
* @param {string} str - 需要裁剪的字符串
* @returns {boolean}
*/
static trim(str = '') {
return str.replace(/(^\s*)|(\s*$)/g, "");
}
/**
* @function ol.supermap.Util.newGuid
* @description 随机生成id
* @param {string} attr - 几位数字的id
* @returns {string}
*/
static newGuid(attr) {
let len = attr || 32;
let guid = "";
for (let i = 1; i < len; i++) {
let n = Math.floor(Math.random() * 16.0).toString(16);
guid += n;
}
return guid;
}
/**
* @function ol.supermap.Util.isNumber
* @description 检测数据是否为number
* @param {string} value - 值，未知数据类型
* @returns {boolean}
*/
static isNumber(value) {
if (value === '') {
return false;
}
let mdata = Number(value);
if (mdata === 0) {
return true;
}
return !isNaN(mdata);
}
/**
* @function ol.supermap.Util.getFeatureBySQL
* @description 获取feature
* @param {string} url - 获取feature的请求地址
* @param {string} datasetNames - 数据集名称
* @param {function} processCompleted - 成功请求的回调函数
* @param {function} processFaild - 失败请求的回调函数
*/
static getFeatureBySQL(url, datasetNames, processCompleted, processFaild) {
let getFeatureParam, getFeatureBySQLService, getFeatureBySQLParams;
getFeatureParam = new FilterParameter({
name: datasetNames.join().replace(":", "@"),
attributeFilter: 'SMID > 0'
});
getFeatureBySQLParams = new GetFeaturesBySQLParameters({
queryParameter: getFeatureParam,
datasetNames: datasetNames,
fromIndex: 0,
toIndex: 100000,
maxFeatures: 100000,
returnContent: true
});
let options = {
eventListeners: {
processCompleted: function (getFeaturesEventArgs) {
processCompleted && processCompleted(getFeaturesEventArgs);
},
processFailed: function (e) {
processFaild && processFaild(e);
}
},
withCredentials: true
};
getFeatureBySQLService = new GetFeaturesBySQLService(url, options);
getFeatureBySQLService.processAsync(getFeatureBySQLParams);
}
static queryFeatureBySQL(url, layerName, attributeFilter, fields, epsgCode, processCompleted, processFaild, startRecord, recordLength, onlyAttribute) {
var queryParam, queryBySQLParams, queryBySQLService;
queryParam = new FilterParameter({
name: layerName,
attributeFilter: attributeFilter
});
if (fields) {
queryParam.fields = fields;
}
var params = {
queryParams: [queryParam]
};
if (onlyAttribute) {
params.queryOption = QueryOption.ATTRIBUTE;
}
startRecord && (params.startRecord = startRecord);
recordLength && (params.expectCount = recordLength);
if (epsgCode) {
params.prjCoordSys = {
epsgCode: epsgCode
}
}
queryBySQLParams = new QueryBySQLParameters(params);
queryBySQLService = new QueryService(url);
queryBySQLService.queryBySQL(queryBySQLParams, function (data) {
data.type === 'processCompleted' ? processCompleted(data) : processFaild(data)
});
}
/**
* @function ol.supermap.Util.getFeatureProperties
* @description 从feature中获取properties
* @param {array} features 要素数组
* @returns {array} 属性
*/
static getFeatureProperties(features) {
let properties = [];
if (Util.isArray(features) && features.length) {
features.forEach(feature => {
let property = feature.get('attributes');
property && properties.push(property);
});
}
return properties;
}
/**
* @function ol.supermap.Util.isMatchAdministrativeName
* @param {string} featureName 原始数据中的地名
* @param {string} fieldName 需要匹配的地名
* @returns {boolean} 是否匹配
*/
static isMatchAdministrativeName(featureName, fieldName) {
if (Util.isString(fieldName)) {
let shortName = featureName.substr(0, 2);
// 张家口市和张家界市 特殊处理
if (shortName === '张家') {
shortName = featureName.substr(0, 3);
}
return !!fieldName.match(new RegExp(shortName));
}
return false;
}
}