108 lines
2.9 KiB
JavaScript
108 lines
2.9 KiB
JavaScript
import _ol_Map_ from '../src/ol/Map.js';
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import _ol_View_ from '../src/ol/View.js';
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import _ol_extent_ from '../src/ol/extent.js';
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import _ol_layer_Tile_ from '../src/ol/layer/Tile.js';
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import _ol_proj_ from '../src/ol/proj.js';
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import _ol_source_OSM_ from '../src/ol/source/OSM.js';
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import _ol_source_TileImage_ from '../src/ol/source/TileImage.js';
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var map = new _ol_Map_({
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layers: [
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new _ol_layer_Tile_({
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source: new _ol_source_OSM_()
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})
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],
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target: 'map',
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view: new _ol_View_({
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projection: 'EPSG:3857',
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center: [0, 0],
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zoom: 1
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})
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});
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var queryInput = document.getElementById('epsg-query');
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var searchButton = document.getElementById('epsg-search');
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var resultSpan = document.getElementById('epsg-result');
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var renderEdgesCheckbox = document.getElementById('render-edges');
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function setProjection(code, name, proj4def, bbox) {
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if (code === null || name === null || proj4def === null || bbox === null) {
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resultSpan.innerHTML = 'Nothing usable found, using EPSG:3857...';
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map.setView(new _ol_View_({
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projection: 'EPSG:3857',
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center: [0, 0],
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zoom: 1
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}));
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return;
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}
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resultSpan.innerHTML = '(' + code + ') ' + name;
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var newProjCode = 'EPSG:' + code;
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proj4.defs(newProjCode, proj4def);
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var newProj = _ol_proj_.get(newProjCode);
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var fromLonLat = _ol_proj_.getTransform('EPSG:4326', newProj);
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// very approximate calculation of projection extent
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var extent = _ol_extent_.applyTransform(
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[bbox[1], bbox[2], bbox[3], bbox[0]], fromLonLat);
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newProj.setExtent(extent);
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var newView = new _ol_View_({
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projection: newProj
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});
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map.setView(newView);
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newView.fit(extent);
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}
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function search(query) {
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resultSpan.innerHTML = 'Searching ...';
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fetch('https://epsg.io/?format=json&q=' + query).then(function(response) {
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return response.json();
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}).then(function(json) {
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var results = json['results'];
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if (results && results.length > 0) {
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for (var i = 0, ii = results.length; i < ii; i++) {
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var result = results[i];
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if (result) {
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var code = result['code'], name = result['name'],
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proj4def = result['proj4'], bbox = result['bbox'];
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if (code && code.length > 0 && proj4def && proj4def.length > 0 &&
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bbox && bbox.length == 4) {
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setProjection(code, name, proj4def, bbox);
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return;
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}
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}
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}
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}
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setProjection(null, null, null, null);
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});
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}
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/**
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* Handle click event.
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* @param {Event} event The event.
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*/
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searchButton.onclick = function(event) {
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search(queryInput.value);
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event.preventDefault();
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};
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/**
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* Handle change event.
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*/
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renderEdgesCheckbox.onchange = function() {
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map.getLayers().forEach(function(layer) {
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if (layer instanceof _ol_layer_Tile_) {
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var source = layer.getSource();
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if (source instanceof _ol_source_TileImage_) {
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source.setRenderReprojectionEdges(renderEdgesCheckbox.checked);
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}
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}
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});
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};
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