Function initMap

src/openlayers/mapping/InitMap.js:44–91

(url, options = {})

 * ```
 * */
export async function initMap(url, options = {}) {
  const { mapOptions, viewOptions, layerOptions, sourceOptions } = options;
  const initMapService = new InitMapServiceBase(MapService, url, options);
  const tilesets = await initMapService.getTilesets();
  const result = await initMapService.getMapInfo();
  if (!result || !result.result) {
    return 'service is not work!';
  }
  const mapObject = result.result;
  const { prjCoordSys, bounds, center, visibleScales, coordUnit, scale, dpi } = mapObject;
  // tileset和地图不同投影，优先使用地图
  const tileset = getTileset(tilesets.result, { prjCoordSys, tileType: 'Image' });

  const config = {
    center,
    bounds,
    dpi,
    visibleScales,
    scale,
    prjCoordSys,
    coordUnit,
    tileFormat: 'webp',
    tileSize: 256
  };
  if (tileset) {
    config.tileFormat = getTileFormat(tileset);
    config.tileSize = tileset.tileWidth || 256;
    config.transparent = tileset.transparent || true;
    config.origin = [tileset.originalPoint.x, tileset.originalPoint.y];
    config.resolutions = tileset.resolutions;
    config.scaleDenominators = tileset.scaleDenominators;
    config.dpi = Util.getDpi(1.0 / tileset.scaleDenominators[0], tileset.resolutions[0], coordUnit);
  }

  if (!get(`EPSG:${prjCoordSys.epsgCode}`) && !isPlaneProjection(prjCoordSys.type)) {
    const wkt = await initMapService.getWKT();
    registerProj(prjCoordSys.epsgCode, wkt, bounds);
  }

  let map = createMap(config, mapOptions, viewOptions);
  let { layer, source } = createLayer(url, config, sourceOptions, layerOptions);
  map.addLayer(layer);
  return {
    map,
    source,
    layer
  };
}

/**
 * @function viewOptionsFromMapJSON