274 lines
8.7 KiB
JavaScript
274 lines
8.7 KiB
JavaScript
import {get as getProjection, transformExtent, fromLonLat} from '../../../../src/ol/proj.js';
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import TileSource from '../../../../src/ol/source/Tile.js';
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import UTFGrid, {CustomTile} from '../../../../src/ol/source/UTFGrid.js';
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import TileGrid from '../../../../src/ol/tilegrid/TileGrid.js';
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describe('ol.source.UTFGrid', function() {
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const url = 'spec/ol/data/utfgrid.json';
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let tileJson = null;
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// Load and parse the UTFGrid fixture
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before(function(done) {
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const client = new XMLHttpRequest();
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client.addEventListener('load', function() {
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tileJson = JSON.parse(this.responseText);
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done();
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});
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client.addEventListener('error', function() {
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done(new Error('Failed to fetch ' + url));
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});
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client.open('GET', url);
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client.send();
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});
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after(function() {
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tileJson = null;
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});
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function getUTFGrid() {
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return new UTFGrid({
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url: url
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});
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}
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describe('constructor', function() {
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it('needs to be constructed with url option', function() {
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const source = new UTFGrid({url: url});
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expect(source).to.be.an(UTFGrid);
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expect(source).to.be.an(TileSource);
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expect(function() {
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// no options: will throw
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return new UTFGrid();
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}).to.throwException();
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expect(function() {
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// no url-option: will throw
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return new UTFGrid({});
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}).to.throwException();
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expect(getUTFGrid()).to.be.an(UTFGrid);
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});
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});
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describe('change event (ready)', function() {
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it('is fired when the source is ready', function(done) {
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const source = new UTFGrid({
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url: url
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});
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expect(source.getState()).to.be('loading');
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expect(source.tileGrid).to.be(null);
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source.on('change', function(event) {
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if (source.getState() === 'ready') {
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expect(source.tileGrid).to.be.an(TileGrid);
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done();
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}
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});
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});
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});
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describe('change event (error)', function(done) {
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it('is fired when the source fails to initialize', function(done) {
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const source = new UTFGrid({
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url: 'Bogus UTFGrid URL'
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});
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expect(source.getState()).to.be('loading');
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expect(source.tileGrid).to.be(null);
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source.on('change', function(event) {
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if (source.getState() === 'error') {
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expect(source.tileGrid).to.be(null);
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done();
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}
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});
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});
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});
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describe('#handleTileJSONResponse', function() {
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it('sets up a tileGrid', function() {
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const source = getUTFGrid();
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expect(source.getTileGrid()).to.be(null);
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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const tileGrid = source.getTileGrid();
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expect(tileGrid).to.not.be(null);
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expect(tileGrid).to.be.an(TileGrid);
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});
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it('sets up a tilegrid with expected extent', function() {
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const source = getUTFGrid();
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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const tileGrid = source.getTileGrid();
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const extent = tileGrid.getExtent();
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const proj4326 = getProjection('EPSG:4326');
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const proj3857 = getProjection('EPSG:3857');
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const expectedExtent4326 = tileJson.bounds;
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const expectedExtent3857 = transformExtent(
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expectedExtent4326, proj4326, proj3857
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);
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expect(extent).to.eql(proj3857.getExtent());
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expect(extent[0]).to.roughlyEqual(expectedExtent3857[0], 1e-8);
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expect(extent[1]).to.roughlyEqual(expectedExtent3857[1], 1e-8);
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expect(extent[2]).to.roughlyEqual(expectedExtent3857[2], 1e-8);
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expect(extent[3]).to.roughlyEqual(expectedExtent3857[3], 1e-8);
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});
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it('sets up a tilegrid with expected minZoom', function() {
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const source = getUTFGrid();
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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const tileGrid = source.getTileGrid();
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const minZoom = tileGrid.getMinZoom();
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expect(minZoom).to.eql(tileJson.minzoom);
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});
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it('sets up a tilegrid with expected maxZoom', function() {
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const source = getUTFGrid();
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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const tileGrid = source.getTileGrid();
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const maxZoom = tileGrid.getMaxZoom();
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expect(maxZoom).to.eql(tileJson.maxzoom);
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});
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it('sets up a template', function() {
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const source = getUTFGrid();
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expect(source.getTemplate()).to.be(undefined);
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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const template = source.getTemplate();
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expect(template).to.not.be(undefined);
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expect(template).to.be(tileJson.template);
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});
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it('sets up correct attribution', function() {
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const source = getUTFGrid();
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expect(source.getAttributions()).to.be(null);
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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const attributions = source.getAttributions();
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expect(attributions).to.not.be(null);
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expect(typeof attributions).to.be('function');
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});
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it('sets correct state', function() {
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const source = getUTFGrid();
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expect(source.getState()).to.be('loading');
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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expect(source.getState()).to.be('ready');
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});
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});
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describe('#forDataAtCoordinateAndResolution', function() {
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let source = null;
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const bonn3857 = fromLonLat([7.099814, 50.733992]);
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const noState3857 = [0, 0];
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const resolutionZoom1 = 78271.51696402048;
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let gridJson110 = null;
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// Called once for this describe section, this method will request a local
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// grid for one tile (1/1/0) and store the result in a variable. This allows
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// us to overwrite getTile in a way that removes the dependency on an
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// external service. See below in the `beforeEach`-method.
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before(function(done) {
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const client = new XMLHttpRequest();
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client.addEventListener('load', function() {
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gridJson110 = JSON.parse(this.responseText);
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done();
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});
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client.addEventListener('error', function() {
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done(new Error('Failed to fetch local grid.json'));
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});
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client.open('GET', 'spec/ol/data/mapbox-geography-class-1-1-0.grid.json');
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client.send();
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});
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after(function() {
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gridJson110 = null;
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});
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beforeEach(function() {
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source = getUTFGrid();
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// call the handleTileJSONResponse method with our
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// locally available tileJson (from `before`)
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source.handleTileJSONResponse(tileJson);
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// Override getTile method to not depend on the external service. The
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// signature of the method is kept the same, but the returned tile will
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// always be for [1, 1, 0].
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source.getTile = function(z, x, y, pixelRatio, projection) {
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const tileCoord = [1, 1, 0]; // overwritten to match our stored JSON
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const urlTileCoord =
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this.getTileCoordForTileUrlFunction(tileCoord, projection);
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const tileUrl = this.tileUrlFunction_(urlTileCoord, pixelRatio, projection);
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const tile = new CustomTile(
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tileCoord,
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tileUrl !== undefined ? 0 : 4, // IDLE : EMPTY
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tileUrl !== undefined ? tileUrl : '',
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this.tileGrid.getTileCoordExtent(tileCoord),
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true); // always preemptive, so loading doesn't happen automatically
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// manually call handleLoad_ with our local JSON data
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tile.handleLoad_(gridJson110);
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return tile;
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};
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});
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afterEach(function() {
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source = null;
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});
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it('calls callback with data if found', function(done) {
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const callback = function(data) {
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expect(arguments).to.have.length(1);
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expect(data).to.not.be(null);
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expect('admin' in data).to.be(true);
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expect(data.admin).to.be('Germany');
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done();
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};
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source.forDataAtCoordinateAndResolution(
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bonn3857, resolutionZoom1, callback, true
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);
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});
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it('calls callback with `null` if not found', function(done) {
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const callback = function(data) {
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expect(arguments).to.have.length(1);
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expect(data).to.be(null);
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done();
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};
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source.forDataAtCoordinateAndResolution(
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noState3857, resolutionZoom1, callback, true
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);
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});
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});
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});
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