186 lines
4.5 KiB
JavaScript
186 lines
4.5 KiB
JavaScript
/**
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* @module ol/source/TileArcGISRest
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*/
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import {inherits} from '../index.js';
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import {createEmpty} from '../extent.js';
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import {modulo} from '../math.js';
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import {assign} from '../obj.js';
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import {toSize, scale as scaleSize} from '../size.js';
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import TileImage from '../source/TileImage.js';
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import _ol_tilecoord_ from '../tilecoord.js';
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import {appendParams} from '../uri.js';
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/**
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* @classdesc
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* Layer source for tile data from ArcGIS Rest services. Map and Image
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* Services are supported.
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*
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* For cached ArcGIS services, better performance is available using the
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* {@link ol.source.XYZ} data source.
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*
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* @constructor
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* @extends {ol.source.TileImage}
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* @param {olx.source.TileArcGISRestOptions=} opt_options Tile ArcGIS Rest
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* options.
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* @api
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*/
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const TileArcGISRest = function(opt_options) {
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const options = opt_options || {};
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TileImage.call(this, {
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attributions: options.attributions,
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cacheSize: options.cacheSize,
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crossOrigin: options.crossOrigin,
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projection: options.projection,
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reprojectionErrorThreshold: options.reprojectionErrorThreshold,
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tileGrid: options.tileGrid,
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tileLoadFunction: options.tileLoadFunction,
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url: options.url,
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urls: options.urls,
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wrapX: options.wrapX !== undefined ? options.wrapX : true,
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transition: options.transition
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});
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/**
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* @private
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* @type {!Object}
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*/
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this.params_ = options.params || {};
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/**
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* @private
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* @type {ol.Extent}
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*/
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this.tmpExtent_ = createEmpty();
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this.setKey(this.getKeyForParams_());
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};
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inherits(TileArcGISRest, TileImage);
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/**
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* @private
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* @return {string} The key for the current params.
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*/
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TileArcGISRest.prototype.getKeyForParams_ = function() {
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let i = 0;
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const res = [];
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for (const key in this.params_) {
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res[i++] = key + '-' + this.params_[key];
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}
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return res.join('/');
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};
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/**
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* Get the user-provided params, i.e. those passed to the constructor through
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* the "params" option, and possibly updated using the updateParams method.
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* @return {Object} Params.
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* @api
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*/
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TileArcGISRest.prototype.getParams = function() {
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return this.params_;
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {ol.Size} tileSize Tile size.
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* @param {ol.Extent} tileExtent Tile extent.
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* @param {number} pixelRatio Pixel ratio.
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* @param {ol.proj.Projection} projection Projection.
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* @param {Object} params Params.
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* @return {string|undefined} Request URL.
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* @private
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*/
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TileArcGISRest.prototype.getRequestUrl_ = function(tileCoord, tileSize, tileExtent,
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pixelRatio, projection, params) {
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const urls = this.urls;
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if (!urls) {
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return undefined;
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}
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// ArcGIS Server only wants the numeric portion of the projection ID.
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const srid = projection.getCode().split(':').pop();
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params['SIZE'] = tileSize[0] + ',' + tileSize[1];
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params['BBOX'] = tileExtent.join(',');
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params['BBOXSR'] = srid;
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params['IMAGESR'] = srid;
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params['DPI'] = Math.round(
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params['DPI'] ? params['DPI'] * pixelRatio : 90 * pixelRatio
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);
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let url;
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if (urls.length == 1) {
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url = urls[0];
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} else {
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const index = modulo(_ol_tilecoord_.hash(tileCoord), urls.length);
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url = urls[index];
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}
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const modifiedUrl = url
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.replace(/MapServer\/?$/, 'MapServer/export')
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.replace(/ImageServer\/?$/, 'ImageServer/exportImage');
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return appendParams(modifiedUrl, params);
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};
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/**
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* @inheritDoc
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*/
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TileArcGISRest.prototype.getTilePixelRatio = function(pixelRatio) {
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return /** @type {number} */ (pixelRatio);
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};
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/**
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* @inheritDoc
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*/
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TileArcGISRest.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio, projection) {
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let tileGrid = this.getTileGrid();
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if (!tileGrid) {
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tileGrid = this.getTileGridForProjection(projection);
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}
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if (tileGrid.getResolutions().length <= tileCoord[0]) {
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return undefined;
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}
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const tileExtent = tileGrid.getTileCoordExtent(
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tileCoord, this.tmpExtent_);
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let tileSize = toSize(
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tileGrid.getTileSize(tileCoord[0]), this.tmpSize);
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if (pixelRatio != 1) {
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tileSize = scaleSize(tileSize, pixelRatio, this.tmpSize);
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}
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// Apply default params and override with user specified values.
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const baseParams = {
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'F': 'image',
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'FORMAT': 'PNG32',
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'TRANSPARENT': true
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};
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assign(baseParams, this.params_);
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return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
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pixelRatio, projection, baseParams);
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};
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/**
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* Update the user-provided params.
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* @param {Object} params Params.
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* @api
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*/
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TileArcGISRest.prototype.updateParams = function(params) {
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assign(this.params_, params);
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this.setKey(this.getKeyForParams_());
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};
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export default TileArcGISRest;
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