57 lines
1.9 KiB
JavaScript
57 lines
1.9 KiB
JavaScript
import Map from '../src/ol/Map.js';
|
|
import View from '../src/ol/View.js';
|
|
import GeoJSON from '../src/ol/format/GeoJSON.js';
|
|
import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
|
|
import {OSM, Vector as VectorSource} from '../src/ol/source.js';
|
|
|
|
const map = new Map({
|
|
layers: [
|
|
new TileLayer({
|
|
source: new OSM()
|
|
}),
|
|
new VectorLayer({
|
|
source: new VectorSource({
|
|
url: 'data/geojson/countries.geojson',
|
|
format: new GeoJSON()
|
|
}),
|
|
opacity: 0.5
|
|
})
|
|
],
|
|
target: 'map',
|
|
view: new View({
|
|
center: [0, 0],
|
|
zoom: 2
|
|
})
|
|
});
|
|
|
|
document.getElementById('export-png').addEventListener('click', function() {
|
|
map.once('rendercomplete', function() {
|
|
const mapCanvas = document.createElement('canvas');
|
|
const size = map.getSize();
|
|
mapCanvas.width = size[0];
|
|
mapCanvas.height = size[1];
|
|
const mapContext = mapCanvas.getContext('2d');
|
|
Array.prototype.forEach.call(document.querySelectorAll('.ol-layer canvas'), function(canvas) {
|
|
if (canvas.width > 0) {
|
|
const opacity = canvas.parentNode.style.opacity;
|
|
mapContext.globalAlpha = opacity === '' ? 1 : Number(opacity);
|
|
const transform = canvas.style.transform;
|
|
// Get the transform parameters from the style's transform matrix
|
|
const matrix = transform.match(/^matrix\(([^\(]*)\)$/)[1].split(',').map(Number);
|
|
// Apply the transform to the export map context
|
|
CanvasRenderingContext2D.prototype.setTransform.apply(mapContext, matrix);
|
|
mapContext.drawImage(canvas, 0, 0);
|
|
}
|
|
});
|
|
if (navigator.msSaveBlob) {
|
|
// link download attribuute does not work on MS browsers
|
|
navigator.msSaveBlob(mapCanvas.msToBlob(), 'map.png');
|
|
} else {
|
|
const link = document.getElementById('image-download');
|
|
link.href = mapCanvas.toDataURL();
|
|
link.click();
|
|
}
|
|
});
|
|
map.renderSync();
|
|
});
|