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| import Map from 'ol/Map.js';
import View from 'ol/View.js';
import WKT from 'ol/format/WKT.js';
import {OSM, Vector as VectorSource} from 'ol/source.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
const raster = new TileLayer({
source: new OSM(),
});
const format = new WKT();
const feature = format.readFeature(
'POLYGON((10.689697265625 -25.0927734375, 34.595947265625 ' +
'-20.1708984375, 38.814697265625 -35.6396484375, 13.502197265625 ' +
'-39.1552734375, 10.689697265625 -25.0927734375))'
);
feature.getGeometry().transform('EPSG:4326', 'EPSG:3857');
const vector = new VectorLayer({
source: new VectorSource({
features: [feature],
}),
opacity: 0.5,
});
const map = new Map({
layers: [raster, vector],
target: 'map',
view: new View({
center: [0, 0],
zoom: 2,
}),
});
const dims = {
a0: [1189, 841],
a1: [841, 594],
a2: [594, 420],
a3: [420, 297],
a4: [297, 210],
a5: [210, 148],
};
const exportButton = document.getElementById('export-pdf');
exportButton.addEventListener(
'click',
function () {
exportButton.disabled = true;
document.body.style.cursor = 'progress';
const format = document.getElementById('format').value;
const resolution = document.getElementById('resolution').value;
const dim = dims[format];
const width = Math.round((dim[0] * resolution) / 25.4);
const height = Math.round((dim[1] * resolution) / 25.4);
const size = map.getSize();
const viewResolution = map.getView().getResolution();
map.once('rendercomplete', function () {
const mapCanvas = document.createElement('canvas');
mapCanvas.width = width;
mapCanvas.height = height;
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;
const matrix = transform
.match(/^matrix\(([^\(]*)\)$/)[1]
.split(',')
.map(Number);
CanvasRenderingContext2D.prototype.setTransform.apply(
mapContext,
matrix
);
mapContext.drawImage(canvas, 0, 0);
}
}
);
mapContext.globalAlpha = 1;
mapContext.setTransform(1, 0, 0, 1, 0, 0);
const pdf = new jspdf.jsPDF('landscape', undefined, format);
pdf.addImage(
mapCanvas.toDataURL('image/jpeg'),
'JPEG',
0,
0,
dim[0],
dim[1]
);
pdf.save('map.pdf');
map.setSize(size);
map.getView().setResolution(viewResolution);
exportButton.disabled = false;
document.body.style.cursor = 'auto';
});
const printSize = [width, height];
map.setSize(printSize);
const scaling = Math.min(width / size[0], height / size[1]);
map.getView().setResolution(viewResolution / scaling);
},
false
);
|
)
