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/* Copyright© 2000 - 2021 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,
QueryBySQLParameters,
QueryOption
} from '@supermap/iclient-common';
import { QueryService } from '../services/QueryService';
import { FeatureService } from '../services/FeatureService';
import * as olUtil from 'ol/util';
import Geometry from 'ol/geom/Geometry';
import { getVectorContext } from 'ol/render';
import VectorSource from 'ol/source/Vector';
import VectorLayer from 'ol/layer/Vector';
import { Fill, Style } from 'ol/style';
import Feature from 'ol/Feature';
/**
* @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) {
return null;
}
return new GeoJSONFormat().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) {
return null;
}
const result = new GeoJSONFormat().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) {
const inchPerMeter = 1 / 0.0254;
// 地球半径。
const meterPerMapUnit = this.getMeterPerMapUnit(mapUnit);
const scale = 1 / (resolution * dpi * inchPerMeter * meterPerMapUnit);
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) {
if (points.length < 1) {
return '';
}
const geometryParam = {};
const results = [];
for (let i = 0; i < points.length; i++) {
const point = { x: points[i][0], 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) {
const inchPerMeter = 1 / 0.0254;
const meterPerMapUnitValue = this.getMeterPerMapUnit(mapUnit);
const resolution = 1 / (scale * dpi * inchPerMeter * meterPerMapUnitValue);
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) {
const earchRadiusInMeters = 6378137;
let 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) {
const defaultOptions = {
titles: ['lon', 'lat'],
latitudeTitle: 'lat',
longitudeTitle: 'lon',
fieldSeparator: ',',
lineSeparator: '\n',
deleteDoubleQuotes: true,
firstLineTitles: false
};
options = options || defaultOptions;
const _propertiesNames = [];
if (typeof csv === 'string') {
let 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++) {
let 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) {
const json = {};
json['type'] = 'FeatureCollection';
json['features'] = [];
const titulos = options.titles;
csv = csv.split(options.lineSeparator);
for (let num_linea = 0; num_linea < csv.length; num_linea++) {
const campos = csv[num_linea].trim().split(options.fieldSeparator),
lng = parseFloat(campos[titulos.indexOf(options.longitudeTitle)]),
lat = parseFloat(campos[titulos.indexOf(options.latitudeTitle)]);
const isInRange = lng < 180 && lng > -180 && lat < 90 && lat > -90;
if (!(campos.length === titulos.length && isInRange)) {
continue;
}
const feature = {};
feature['type'] = 'Feature';
feature['geometry'] = {};
feature['properties'] = {};
feature['geometry']['type'] = 'Point';
feature['geometry']['coordinates'] = [lng, lat];
for (let 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) {
const 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() {
const 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.isObject
* @description 是否为对象
* @param {any} obj - 需要判断的内容
* @returns {boolean}
*/
static isObject(obj) {
return Object.prototype.toString.call(obj) === '[object Object]';
}
/**
* @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 {object} serviceOptions - 服务类需要的参数
* @param {function} processCompleted - 成功请求的回调函数
* @param {function} processFaild - 失败请求的回调函数
* @param {string | number} targetEpsgCode - 动态投影的目标坐标系对应的 EPSG Code
*/
static getFeatureBySQL(url, datasetNames, serviceOptions, processCompleted, processFaild, targetEpsgCode) {
let getFeatureParam = new FilterParameter({
name: datasetNames.join().replace(':', '@')
// attributeFilter: 'SMID > 0' // shp第三方发布的数据没有SMID字段，http://yt.ispeco.com:8099/issue/DV-131
}),
getFeatureBySQLParams = new GetFeaturesBySQLParameters({
queryParameter: getFeatureParam,
datasetNames: datasetNames,
fromIndex: 0,
toIndex: 100000,
maxFeatures: 100000,
returnContent: true,
targetEpsgCode
}),
callback = (serviceResult) => {
if (serviceResult.type === 'processCompleted') {
processCompleted && processCompleted(serviceResult);
} else {
processFaild && processFaild(serviceResult);
}
};
new FeatureService(url, serviceOptions).getFeaturesBySQL(getFeatureBySQLParams, callback);
}
static queryFeatureBySQL(
url,
layerName,
attributeFilter,
fields,
epsgCode,
processCompleted,
processFaild,
startRecord,
recordLength,
onlyAttribute
) {
const queryParam = new FilterParameter({
name: layerName,
attributeFilter: attributeFilter
});
if (fields) {
queryParam.fields = fields;
}
const params = {
queryParams: [queryParam]
};
if (onlyAttribute) {
params.queryOption = QueryOption.ATTRIBUTE;
}
startRecord && (params.startRecord = startRecord);
recordLength && (params.expectCount = recordLength);
if (epsgCode) {
params.prjCoordSys = {
epsgCode: epsgCode
};
}
const queryBySQLParams = new QueryBySQLParameters(params);
const 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;
}
/**
* @function ol.supermap.Util.getHighestMatchAdministration
* @param {string} featureName 初始匹配的要素数组
* @param {string} fieldName 要匹配的地名
* @returns {boolean} 是否匹配
*/
static getHighestMatchAdministration(features, fieldName) {
let filterFeatures = features.filter(item => {
return Util.isMatchAdministrativeName(item.properties.Name, fieldName);
})
let maxMatchPercent = 0, maxMatchFeature = null;
filterFeatures.forEach(feature => {
let count = 0;
Array.from(new Set(feature.properties.Name.split(''))).forEach((char) => {
if (fieldName.includes(char)) {
count++;
}
});
if (count > maxMatchPercent) {
maxMatchPercent = count;
maxMatchFeature = feature;
}
});
return maxMatchFeature;
}
/**
* @function ol.supermap.Util.setMask
* @description 为图层设置掩膜。
* @version 10.1.0
* @param {ol/layer/Layer|Array.<ol/layer/Layer>} layers 图层
* @param {ol/geom/Geometry|ol/feature} polygon 掩膜矢量要素，支持面类型的要素。
*/
static setMask(layers, polygon) {
if (!polygon) {
return;
}
const geo = polygon instanceof Feature ? polygon.getGeometry() : polygon;
if (!(geo instanceof Geometry) && ['MultiPolygon', 'Polygon'].indexOf(polygon.getType()) < 0) {
return;
}
const feature = polygon instanceof Feature ? polygon : new Feature(polygon);
const style = new Style({
fill: new Fill({
color: 'black'
})
});
const clipLayer = new VectorLayer({
source: new VectorSource({
features: [feature],
wrapX: false
})
});
const clipRender = function (e) {
const vectorContext = getVectorContext(e);
e.context.globalCompositeOperation = 'destination-in';
clipLayer.getSource().forEachFeature(function (feature) {
vectorContext.drawFeature(feature, style);
e.context.globalCompositeOperation = 'source-over';
});
};
const todoLayers = Array.isArray(layers) ? layers : [layers];
Util.unsetMask(todoLayers);
todoLayers.forEach((layer) => {
layer.classNameBak_ = layer.className_;
layer.className_ = `ol_mask_layer_${layer.ol_uid}`;
layer.clipRender = clipRender;
layer.extentBak_ = layer.getExtent();
layer.setExtent(clipLayer.getSource().getExtent());
layer.on('postrender', clipRender);
layer.changed();
});
}
/**
* @function ol.supermap.Util.unsetMask
* @description 取消图层掩膜。
* @version 10.1.0
* @param {ol/layer/Layer|Array.<ol/layer/Layer>} layers 图层
*/
static unsetMask(layers) {
const todoLayers = Array.isArray(layers) ? layers : [layers];
for (let index = 0; index < todoLayers.length; index++) {
const layer = todoLayers[index];
if (!layer.clipRender) {
continue;
}
layer.un('postrender', layer.clipRender);
layer.className_ = layer.classNameBak_;
layer.setExtent(layer.extentBak);
delete layer.classNameBak_;
delete layer.clipRender;
delete layer.extentBak_;
layer.changed();
}
}
}