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InitMap.js
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import mapboxgl from 'mapbox-gl';
import { MapService } from '../services/MapService';
import { FetchRequest } from '@supermapgis/iclient-common/util/FetchRequest';
import { InitMapServiceBase, isPlaneProjection, getZoom, getTileset, getTileFormat } from '@supermapgis/iclient-common/iServer/InitMapServiceBase';
import { Util } from '@supermapgis/iclient-common/commontypes/Util';
import { SecurityManager } from '@supermapgis/iclient-common/security/SecurityManager';
import proj4 from 'proj4';
/**
* @function initMap
* @description 根据 SuperMap iServer 服务参数，创建地图与图层。目前仅支持SuperMap iServer 地图服务。
* @category BaseTypes Util
* @version 11.1.1
* @param {number} url - rest 地图服务地址。例如: http://{ip}:{port}/iserver/services/map-world/rest/maps/World。
* @param {Object} options - 参数。
* @param {Object} [options.type] - 地图类型。可选值 'raster' | 'vector-tile'。默认 'raster'。
* @param {Object} [options.mapOptions] - 地图配置，参数设置参考 {@link https://docs.mapbox.com/mapbox-gl-js/api/map/}。
* @param {string} [options.proxy] - 服务代理地址。
* @param {boolean} [options.withCredentials=false] - 请求是否携带 cookie。
* @param {boolean} [options.crossOrigin] - 是否允许跨域请求。
* @param {Object} [options.headers] - 请求头。
* @returns {Object} 实例对象。对象包括地图实例。
* @usage
* ```
* // 浏览器
* <script type="text/javascript" src="{cdn}"></script>
* <script>
* const initMap = {namespace}.initMap(url, { mapOptions });
*
* </script>
* // ES6 Import
* import { initMap } from '{npm}';
*
* initMap(url, { mapOptions })
* ```
* */
export function initMap(url, options = {}) {
const initMapService = new InitMapServiceBase(MapService, url, options);
return initMapService.getMapInfo(async (res, resolve, reject) => {
try {
if (res.type === 'processCompleted') {
const {
dynamicProjection,
prjCoordSys: { epsgCode, type }
} = res.result;
if (isPlaneProjection(type)) {
reject(new Error('mapbox-gl cannot support plane coordinate system.'));
return;
}
if (epsgCode !== 3857 && !dynamicProjection && !mapboxgl.CRS) {
reject(
new Error(
`The EPSG code ${epsgCode} needs to include mapbox-gl-enhance.js. Refer to the example: https://iclient.supermap.io/examples/mapboxgl/editor.html#mvtVectorTile_2362`
)
);
return;
}
const mapOptions = await createMapOptions(url, res.result, { ...options, initMapService });
const map = new mapboxgl.Map(mapOptions);
if (!map.loaded()) {
map.on('load', () => {
resolve({ map });
});
} else {
resolve({ map });
}
return;
}
reject(new Error('Fetch mapService is failed.'));
} catch (error) {
reject(error);
}
});
}
/**
* @private
* @function getCrsExtent
* @description 获取当前坐标系范围，[左，下，右，上]。
* @param {Object|Array} extent -坐标系范围。
* @returns {Array}
*/
function getCRSExtent(extent) {
if (extent instanceof Array) {
return extent;
}
if (extent.leftBottom && extent.rightTop) {
return [extent.leftBottom.x, extent.leftBottom.y, extent.rightTop.x, extent.rightTop.y];
}
return [extent.left, extent.bottom, extent.right, extent.top];
}
/**
* @private
* @function defineCRSByWKT
* @description 定义crs。
* @param {string} crsName - 投影名称。
* @param {string} wkt - wkt。
* @param {Object} extent - 坐标系范围。
* @returns {string}
*/
function defineCRSByWKT(crsName, wkt, extent) {
const crsExtent = getCRSExtent(extent);
const defineCRS = new mapboxgl.CRS(crsName, wkt, crsExtent);
return defineCRS;
}
/**
* @private
* @function transformMapCenter
* @description 转换center。
* @param {Object} mapInfoCenter - 中心点。
* @param {string} baseProjection - 坐标投影。
* @returns {Array}
*/
function transformMapCenter(mapInfoCenter, sourceProjection) {
let center = mapInfoCenter;
if (sourceProjection === 'EPSG:3857') {
return proj4(sourceProjection, 'EPSG:4326', mapInfoCenter);
}
if (sourceProjection !== 'EPSG:4326') {
return mapboxgl.proj4(sourceProjection, 'EPSG:4326', mapInfoCenter);
}
return center;
}
/**
* @private
* @function getVectorTileCRSExtent
* @description 获取矢量瓦片坐标系范围。
* @param {string} vectorStyleUrl - 矢量瓦片 style json 服务地址。
* @param {string} restMapUrl - 矢量瓦片 rest 地图服务地址。
* @returns {Object}
*/
async function getVectorTileCRSExtent(vectorStyleUrl, restMapUrl) {
try {
const vectorStyleDataRes = await FetchRequest.get(vectorStyleUrl);
const vectorStyleData = await vectorStyleDataRes.json();
if (vectorStyleData.metadata && vectorStyleData.metadata.indexbounds) {
return { extent: vectorStyleData.metadata.indexbounds };
}
const vectorExtentDataRes = await FetchRequest.get(Util.urlPathAppend(restMapUrl, 'prjCoordSys/projection/extent.json'));
const vectorExtentData = await vectorExtentDataRes.json();
return { extent: vectorExtentData, center: vectorStyleData.center };
} catch (error) {
return { extent: [] };
}
}
/**
* @private
* @function createMapOptions
* @description 获取地图参数。
* @param {string} url - rest 地图服务地址。
* @param {Object} resetServiceInfo - rest 地图服务信息。
* @param {Object} [options] - 参数。
* @param {string} [options.type] - 服务代理地址。
* @param {Object} [options.mapOptions] - 地图配置。
* @param {Object} [options.initMapService] - InitMapServiceBase 实例。
* @returns {Object} mapParams。
*/
async function createMapOptions(url, resetServiceInfo, options) {
if (options.type && !['raster', 'vector-tile'].includes(options.type)) {
return Promise.reject(new Error('type must be "raster" or "vector-tile".'));
}
const sourceType = options.type || 'raster';
const mapOptions = options.mapOptions || {};
const {
prjCoordSys: { epsgCode },
bounds,
center,
dpi = 96,
coordUnit,
scale
} = resetServiceInfo;
let mapCenter = center ? [center.x, center.y] : [0, 0];
let crs = `EPSG:${epsgCode}`;
let extent = bounds;
let tileUrl =
sourceType === 'vector-tile'
? Util.urlAppend(Util.urlPathAppend(url, 'tileFeature/vectorstyles.json'), 'type=MapBox_GL&styleonly=true&tileURLTemplate=ZXY')
: url;
tileUrl = SecurityManager.appendCredential(tileUrl);
let nonEnhanceExtraInfo = {};
let enhanceExtraInfo = {};
let zoom;
let tileSize = 512;
let tileFormat = 'png';
if (mapboxgl.CRS) {
const baseProjection = crs;
const wkt = await options.initMapService.getWKT();
let vectorTileInfo;
if (sourceType === 'vector-tile') {
vectorTileInfo = await getVectorTileCRSExtent(tileUrl, url);
extent = vectorTileInfo.extent;
}
crs = defineCRSByWKT(baseProjection, wkt, extent);
if (sourceType === 'raster') {
enhanceExtraInfo.rasterSource = 'iserver';
enhanceExtraInfo.dpi = dpi;
}
if (vectorTileInfo && vectorTileInfo.center) {
mapCenter = vectorTileInfo.center;
} else {
mapCenter = transformMapCenter(mapCenter, baseProjection);
}
const tilesets = await options.initMapService.getTilesets();
const tileset = getTileset(tilesets.result, { prjCoordSys: resetServiceInfo.prjCoordSys, tileType: 'Image' });
if (tileset) {
tileFormat = getTileFormat(tileset);
const maxWidth = Math.max(tileset.bounds.right - tileset.originalPoint.x, tileset.originalPoint.y - tileset.bounds.bottom);
const tileCount = maxWidth / (tileset.resolutions[0] * 256);
zoom = Math.ceil(Math.log2(tileCount));
const closestTileCount = Math.pow(2, zoom);
const width = closestTileCount * 256 * tileset.resolutions[0];
const crsBounds = [
tileset.originalPoint.x,
tileset.originalPoint.y - width,
tileset.originalPoint.x + width,
tileset.originalPoint.y
];
crs = new mapboxgl.CRS(baseProjection, crsBounds);
zoom = zoom - 1;
tileSize = tileset.tileWidth;
}
} else {
crs = 'EPSG:3857';
mapCenter = transformMapCenter(mapCenter, crs);
if (sourceType === 'raster') {
const tileSize = 256;
nonEnhanceExtraInfo.tileSize = tileSize;
const transparent = mapOptions.transparent !== false;
tileUrl = Util.urlAppend(Util.urlPathAppend(tileUrl, 'zxyTileImage.png'), `z={z}&x={x}&y={y}&width=${tileSize}&height=${tileSize}&transparent=${transparent}`);
}
}
if (zoom === undefined) {
zoom = getZoom({ scale, dpi, coordUnit }, extent);
}
return {
container: 'map',
crs,
center: mapCenter,
zoom,
style:
sourceType === 'raster'
? {
version: 8,
sources: {
'smaples-source': {
format: tileFormat,
tileSize,
type: 'raster',
tiles: [tileUrl],
...nonEnhanceExtraInfo,
...enhanceExtraInfo
}
},
layers: [
{
id: 'sample-layer',
type: 'raster',
source: 'smaples-source',
minzoom: 0,
maxzoom: 22
}
]
}
: tileUrl,
...mapOptions
};
}