heli-agri
Version:
HeliAgri is a high-performance, feature-packed library for creating interactive maps on the web. It can display map tiles, vector data and markers loaded from any source on any web page. OpenLayers has been developed to further the use of geographic infor
255 lines (229 loc) • 8.86 kB
JavaScript
/**
* @module ol/source/TileArcGISRest
*/
import TileImage from './TileImage.js';
import {appendParams} from '../uri.js';
import {createEmpty} from '../extent.js';
import {modulo} from '../math.js';
import {scale as scaleSize, toSize} from '../size.js';
import {hash as tileCoordHash} from '../tilecoord.js';
/**
* @typedef {Object} Options
* @property {import("./Source.js").AttributionLike} [attributions] Attributions.
* @property {number} [cacheSize] Initial tile cache size. Will auto-grow to hold at least the number of tiles in the viewport.
* @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images. Note that
* you must provide a `crossOrigin` value if you want to access pixel data with the Canvas renderer.
* See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.
* @property {boolean} [interpolate=true] Use interpolated values when resampling. By default,
* linear interpolation is used when resampling. Set to false to use the nearest neighbor instead.
* @property {Object<string,*>} [params] ArcGIS Rest parameters. This field is optional. Service defaults will be
* used for any fields not specified. `FORMAT` is `PNG32` by default. `F` is `IMAGE` by
* default. `TRANSPARENT` is `true` by default. `BBOX`, `SIZE`, `BBOXSR`,
* and `IMAGESR` will be set dynamically. Set `LAYERS` to
* override the default service layer visibility. See
* https://developers.arcgis.com/rest/services-reference/export-map.htm
* for further reference.
* @property {boolean} [hidpi=true] Use the `ol/Map#pixelRatio` value when requesting
* the image from the remote server.
* @property {import("../tilegrid/TileGrid.js").default} [tileGrid] Tile grid. Base this on the resolutions,
* tilesize and extent supported by the server.
* If this is not defined, a default grid will be used: if there is a projection
* extent, the grid will be based on that; if not, a grid based on a global
* extent with origin at 0,0 will be used.
* @property {import("../proj.js").ProjectionLike} [projection] Projection. Default is the view projection.
* The projection code must contain a numeric end portion separated by :
* or the entire code must form a valid ArcGIS SpatialReference definition.
* @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).
* Higher values can increase reprojection performance, but decrease precision.
* @property {import("../Tile.js").LoadFunction} [tileLoadFunction] Optional function to load a tile given a URL.
* The default is
* ```js
* function(imageTile, src) {
* imageTile.getImage().src = src;
* };
* ```
* @property {string} [url] ArcGIS Rest service URL for a Map Service or Image Service. The
* url should include /MapServer or /ImageServer.
* @property {boolean} [wrapX=true] Whether to wrap the world horizontally.
* @property {number} [transition] Duration of the opacity transition for rendering. To disable the opacity
* transition, pass `transition: 0`.
* @property {Array<string>} [urls] ArcGIS Rest service urls. Use this instead of `url` when the ArcGIS
* Service supports multiple urls for export requests.
* @property {number|import("../array.js").NearestDirectionFunction} [zDirection=0]
* Choose whether to use tiles with a higher or lower zoom level when between integer
* zoom levels. See {@link module:ol/tilegrid/TileGrid~TileGrid#getZForResolution}.
*/
/**
* @classdesc
* Layer source for tile data from ArcGIS Rest services. Map and Image
* Services are supported.
*
* For cached ArcGIS services, better performance is available using the
* {@link module:ol/source/XYZ~XYZ} data source.
* @api
*/
class TileArcGISRest extends TileImage {
/**
* @param {Options} [options] Tile ArcGIS Rest options.
*/
constructor(options) {
options = options ? options : {};
super({
attributions: options.attributions,
cacheSize: options.cacheSize,
crossOrigin: options.crossOrigin,
interpolate: options.interpolate,
projection: options.projection,
reprojectionErrorThreshold: options.reprojectionErrorThreshold,
tileGrid: options.tileGrid,
tileLoadFunction: options.tileLoadFunction,
url: options.url,
urls: options.urls,
wrapX: options.wrapX !== undefined ? options.wrapX : true,
transition: options.transition,
zDirection: options.zDirection,
});
/**
* @private
* @type {!Object}
*/
this.params_ = options.params || {};
/**
* @private
* @type {boolean}
*/
this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
/**
* @private
* @type {import("../extent.js").Extent}
*/
this.tmpExtent_ = createEmpty();
this.setKey(this.getKeyForParams_());
}
/**
* @private
* @return {string} The key for the current params.
*/
getKeyForParams_() {
let i = 0;
const res = [];
for (const key in this.params_) {
res[i++] = key + '-' + this.params_[key];
}
return res.join('/');
}
/**
* Get the user-provided params, i.e. those passed to the constructor through
* the "params" option, and possibly updated using the updateParams method.
* @return {Object} Params.
* @api
*/
getParams() {
return this.params_;
}
/**
* @param {import("../tilecoord.js").TileCoord} tileCoord Tile coordinate.
* @param {import("../size.js").Size} tileSize Tile size.
* @param {import("../extent.js").Extent} tileExtent Tile extent.
* @param {number} pixelRatio Pixel ratio.
* @param {import("../proj/Projection.js").default} projection Projection.
* @param {Object} params Params.
* @return {string|undefined} Request URL.
* @private
*/
getRequestUrl_(
tileCoord,
tileSize,
tileExtent,
pixelRatio,
projection,
params
) {
const urls = this.urls;
if (!urls) {
return undefined;
}
// ArcGIS Server only wants the numeric portion of the projection ID.
// (if there is no numeric portion the entire projection code must
// form a valid ArcGIS SpatialReference definition).
const srid = projection
.getCode()
.split(/:(?=\d+$)/)
.pop();
params['SIZE'] = tileSize[0] + ',' + tileSize[1];
params['BBOX'] = tileExtent.join(',');
params['BBOXSR'] = srid;
params['IMAGESR'] = srid;
params['DPI'] = Math.round(
params['DPI'] ? params['DPI'] * pixelRatio : 90 * pixelRatio
);
let url;
if (urls.length == 1) {
url = urls[0];
} else {
const index = modulo(tileCoordHash(tileCoord), urls.length);
url = urls[index];
}
const modifiedUrl = url
.replace(/MapServer\/?$/, 'MapServer/export')
.replace(/ImageServer\/?$/, 'ImageServer/exportImage');
return appendParams(modifiedUrl, params);
}
/**
* Get the tile pixel ratio for this source.
* @param {number} pixelRatio Pixel ratio.
* @return {number} Tile pixel ratio.
*/
getTilePixelRatio(pixelRatio) {
return this.hidpi_ ? pixelRatio : 1;
}
/**
* Update the user-provided params.
* @param {Object} params Params.
* @api
*/
updateParams(params) {
Object.assign(this.params_, params);
this.setKey(this.getKeyForParams_());
}
/**
* @param {import("../tilecoord.js").TileCoord} tileCoord The tile coordinate
* @param {number} pixelRatio The pixel ratio
* @param {import("../proj/Projection.js").default} projection The projection
* @return {string|undefined} The tile URL
* @override
*/
tileUrlFunction(tileCoord, pixelRatio, projection) {
let tileGrid = this.getTileGrid();
if (!tileGrid) {
tileGrid = this.getTileGridForProjection(projection);
}
if (tileGrid.getResolutions().length <= tileCoord[0]) {
return undefined;
}
if (pixelRatio != 1 && !this.hidpi_) {
pixelRatio = 1;
}
const tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent_);
let tileSize = toSize(tileGrid.getTileSize(tileCoord[0]), this.tmpSize);
if (pixelRatio != 1) {
tileSize = scaleSize(tileSize, pixelRatio, this.tmpSize);
}
// Apply default params and override with user specified values.
const baseParams = {
'F': 'image',
'FORMAT': 'PNG32',
'TRANSPARENT': true,
};
Object.assign(baseParams, this.params_);
return this.getRequestUrl_(
tileCoord,
tileSize,
tileExtent,
pixelRatio,
projection,
baseParams
);
}
}
export default TileArcGISRest;