b5d02dad47
The PDF was only generated AFTER requesting new tiles. When no new tiles where needed, the callback never completed. Also fixed fitting the correct extent. Fixes #7830.
126 lines
3.2 KiB
JavaScript
126 lines
3.2 KiB
JavaScript
// NOCOMPILE
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import Map from '../src/ol/Map.js';
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import View from '../src/ol/View.js';
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import {defaults as defaultControls} from '../src/ol/control.js';
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import WKT from '../src/ol/format/WKT.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import VectorLayer from '../src/ol/layer/Vector.js';
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import {unByKey} from '../src/ol/Observable.js';
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import OSM from '../src/ol/source/OSM.js';
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import VectorSource from '../src/ol/source/Vector.js';
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const raster = new TileLayer({
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source: new OSM()
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});
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const format = new WKT();
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const feature = format.readFeature(
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'POLYGON((10.689697265625 -25.0927734375, 34.595947265625 ' +
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'-20.1708984375, 38.814697265625 -35.6396484375, 13.502197265625 ' +
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'-39.1552734375, 10.689697265625 -25.0927734375))');
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feature.getGeometry().transform('EPSG:4326', 'EPSG:3857');
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const vector = new VectorLayer({
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source: new VectorSource({
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features: [feature]
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})
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});
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const map = new Map({
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layers: [raster, vector],
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target: 'map',
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controls: defaultControls({
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attributionOptions: {
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collapsible: false
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}
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}),
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view: new View({
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center: [0, 0],
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zoom: 2
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})
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});
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const dims = {
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a0: [1189, 841],
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a1: [841, 594],
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a2: [594, 420],
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a3: [420, 297],
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a4: [297, 210],
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a5: [210, 148]
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};
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let loading = 0;
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let loaded = 0;
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const exportButton = document.getElementById('export-pdf');
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exportButton.addEventListener('click', function() {
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exportButton.disabled = true;
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document.body.style.cursor = 'progress';
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const format = document.getElementById('format').value;
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const resolution = document.getElementById('resolution').value;
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const dim = dims[format];
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const width = Math.round(dim[0] * resolution / 25.4);
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const height = Math.round(dim[1] * resolution / 25.4);
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const size = /** @type {ol.Size} */ (map.getSize());
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const extent = map.getView().calculateExtent(size);
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const source = raster.getSource();
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const tileLoadStart = function() {
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++loading;
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};
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let timer;
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let keys = [];
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function tileLoadEndFactory(canvas) {
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return () => {
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++loaded;
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if (timer) {
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clearTimeout(timer);
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timer = null;
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}
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if (loading === loaded) {
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timer = window.setTimeout(() => {
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loading = 0;
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loaded = 0;
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const data = canvas.toDataURL('image/jpeg');
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const pdf = new jsPDF('landscape', undefined, format);
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pdf.addImage(data, 'JPEG', 0, 0, dim[0], dim[1]);
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pdf.save('map.pdf');
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keys.forEach(unByKey);
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keys = [];
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map.setSize(size);
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map.getView().fit(extent, {size});
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map.renderSync();
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exportButton.disabled = false;
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document.body.style.cursor = 'auto';
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}, 500);
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}
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};
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}
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map.once('postcompose', function(event) {
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const canvas = event.context.canvas;
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const tileLoadEnd = tileLoadEndFactory(canvas);
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keys = [
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source.on('tileloadstart', tileLoadStart),
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source.on('tileloadend', tileLoadEnd),
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source.on('tileloaderror', tileLoadEnd)
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];
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tileLoadEnd();
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});
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const printSize = [width, height];
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map.setSize(printSize);
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map.getView().fit(extent, {size: printSize});
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loaded = -1;
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map.renderSync();
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}, false);
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