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| import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import WMTS, {optionsFromCapabilities} from 'ol/source/WMTS.js';
import WMTSCapabilities from 'ol/format/WMTSCapabilities.js';
import proj4 from 'proj4';
import {ScaleLine, defaults as defaultControls} from 'ol/control.js';
import {getPointResolution, get as getProjection} from 'ol/proj.js';
import {register} from 'ol/proj/proj4.js';
proj4.defs(
'EPSG:27700',
'+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 ' +
'+x_0=400000 +y_0=-100000 +ellps=airy ' +
'+towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 ' +
'+units=m +no_defs'
);
register(proj4);
const proj27700 = getProjection('EPSG:27700');
proj27700.setExtent([0, 0, 700000, 1300000]);
const raster = new TileLayer();
const url =
'https://tiles.arcgis.com/tiles/qHLhLQrcvEnxjtPr/arcgis/rest/services/OS_Open_Raster/MapServer/WMTS';
fetch(url)
.then(function (response) {
return response.text();
})
.then(function (text) {
const result = new WMTSCapabilities().read(text);
const options = optionsFromCapabilities(result, {
layer: 'OS_Open_Raster',
});
options.attributions =
'Contains OS data © Crown Copyright and database right ' +
new Date().getFullYear();
options.crossOrigin = '';
options.projection = proj27700;
options.wrapX = false;
raster.setSource(new WMTS(options));
});
const map = new Map({
layers: [raster],
controls: defaultControls({
attributionOptions: {collapsible: false},
}),
target: 'map',
view: new View({
center: [373500, 436500],
projection: proj27700,
zoom: 7,
}),
});
const scaleLine = new ScaleLine({bar: true, text: true, minWidth: 125});
map.addControl(scaleLine);
const dims = {
a0: [1189, 841],
a1: [841, 594],
a2: [594, 420],
a3: [420, 297],
a4: [297, 210],
a5: [210, 148],
};
const exportOptions = {
useCORS: true,
ignoreElements: function (element) {
const className = element.className || '';
return (
className.includes('ol-control') &&
!className.includes('ol-scale') &&
(!className.includes('ol-attribution') ||
!className.includes('ol-uncollapsible'))
);
},
};
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 scale = document.getElementById('scale').value;
const dim = dims[format];
const width = Math.round((dim[0] * resolution) / 25.4);
const height = Math.round((dim[1] * resolution) / 25.4);
const viewResolution = map.getView().getResolution();
const scaleResolution =
scale /
getPointResolution(
map.getView().getProjection(),
resolution / 25.4,
map.getView().getCenter()
);
map.once('rendercomplete', function () {
exportOptions.width = width;
exportOptions.height = height;
html2canvas(map.getViewport(), exportOptions).then(function (canvas) {
const pdf = new jspdf.jsPDF('landscape', undefined, format);
pdf.addImage(
canvas.toDataURL('image/jpeg'),
'JPEG',
0,
0,
dim[0],
dim[1]
);
pdf.save('map.pdf');
scaleLine.setDpi();
map.getTargetElement().style.width = '';
map.getTargetElement().style.height = '';
map.updateSize();
map.getView().setResolution(viewResolution);
exportButton.disabled = false;
document.body.style.cursor = 'auto';
});
});
scaleLine.setDpi(resolution);
map.getTargetElement().style.width = width + 'px';
map.getTargetElement().style.height = height + 'px';
map.updateSize();
map.getView().setResolution(scaleResolution);
},
false
);
|
)
