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| import Graticule from 'ol/layer/Graticule.js';
import Map from 'ol/Map.js';
import OSM from 'ol/source/OSM.js';
import Stroke from 'ol/style/Stroke.js';
import TileDebug from 'ol/source/TileDebug.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import proj4 from 'proj4';
import {applyTransform} from 'ol/extent.js';
import {get as getProjection, getTransform} from 'ol/proj.js';
import {register} from 'ol/proj/proj4.js';
const osmSource = new OSM();
const debugLayer = new TileLayer({
source: new TileDebug({
tileGrid: osmSource.getTileGrid(),
projection: osmSource.getProjection(),
}),
visible: false,
});
const graticule = new Graticule({
strokeStyle: new Stroke({
color: 'rgba(255,120,0,0.9)',
width: 2,
lineDash: [0.5, 4],
}),
showLabels: true,
visible: false,
wrapX: false,
});
const map = new Map({
layers: [
new TileLayer({
source: osmSource,
}),
debugLayer,
graticule,
],
target: 'map',
view: new View({
projection: 'EPSG:3857',
center: [0, 0],
zoom: 1,
}),
});
const queryInput = document.getElementById('epsg-query');
const searchButton = document.getElementById('epsg-search');
const resultSpan = document.getElementById('epsg-result');
const renderEdgesCheckbox = document.getElementById('render-edges');
const showTilesCheckbox = document.getElementById('show-tiles');
const showGraticuleCheckbox = document.getElementById('show-graticule');
function setProjection(code, name, proj4def, bbox) {
if (code === null || name === null || proj4def === null || bbox === null) {
resultSpan.innerHTML = 'Nothing usable found, using EPSG:3857...';
map.setView(
new View({
projection: 'EPSG:3857',
center: [0, 0],
zoom: 1,
}),
);
return;
}
resultSpan.innerHTML = '(' + code + ') ' + name;
proj4.defs(code, proj4def);
register(proj4);
const newProj = getProjection(code);
const fromLonLat = getTransform('EPSG:4326', newProj);
newProj.setWorldExtent(bbox);
if (bbox[0] > bbox[2]) {
bbox[2] += 360;
}
const extent = applyTransform(bbox, fromLonLat, undefined, 8);
newProj.setExtent(extent);
const newView = new View({
projection: newProj,
});
map.setView(newView);
newView.fit(extent);
}
function search(query) {
resultSpan.innerHTML = 'Searching ...';
fetch(
`https://api.maptiler.com/coordinates/search/${query}.json?exports=true&key=Get your own API key at https://www.maptiler.com/cloud/`,
)
.then(function (response) {
return response.json();
})
.then(function (json) {
const results = json['results'];
if (results && results.length > 0) {
for (let i = 0, ii = results.length; i < ii; i++) {
const result = results[i];
if (result) {
const id = result['id'];
const code = id['authority'] + ':' + id['code'];
const name = result['name'];
const proj4def = result['exports']['wkt'];
const bbox = result['bbox'];
if (
code &&
code.length > 0 &&
proj4def &&
proj4def.length > 0 &&
bbox &&
bbox.length == 4
) {
setProjection(code, name, proj4def, bbox);
return;
}
}
}
}
setProjection(null, null, null, null);
});
}
searchButton.onclick = function (event) {
search(queryInput.value);
event.preventDefault();
};
function onReprojectionChange() {
osmSource.setRenderReprojectionEdges(renderEdgesCheckbox.checked);
}
function onGraticuleChange() {
graticule.setVisible(showGraticuleCheckbox.checked);
}
function onTilesChange() {
debugLayer.setVisible(showTilesCheckbox.checked);
}
showGraticuleCheckbox.addEventListener('change', onGraticuleChange);
renderEdgesCheckbox.addEventListener('change', onReprojectionChange);
showTilesCheckbox.addEventListener('change', onTilesChange);
onReprojectionChange();
onGraticuleChange();
onTilesChange();
|
)
