Correct resolution used for scale. Add dpi option.
Also add setDpi and setMinWidth methods Add Print to scale example
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mike-000
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examples/print-to-scale.css
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examples/print-to-scale.css
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.container {
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max-width: 566px;
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width: 100%;
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height: 400px;
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overflow: hidden;
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}
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examples/print-to-scale.html
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examples/print-to-scale.html
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---
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layout: example.html
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title: Print to scale example
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shortdesc: Example of printing a map to a specified scale.
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docs: >
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Example of printing a map to a specified scale.
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The print is exported as a PDF using the <a href="https://github.com/MrRio/jsPDF" target="_blank">jsPDF</a> library.
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Unlike the <a href="export-pdf.html">Export PDF example</a> the on screen map is only used to set the center and rotation.
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The extent printed depends on the scale and page size.
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tags: "print, printing, scale, scaleline, export, pdf"
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resources:
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- https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.2.61/jspdf.min.js
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---
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<div class="container">
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<div id="map" class="map"></div>
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</div>
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<form class="form">
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<label>Page size </label>
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<select id="format">
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<option value="a0">A0 (slow)</option>
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<option value="a1">A1</option>
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<option value="a2">A2</option>
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<option value="a3">A3</option>
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<option value="a4" selected>A4</option>
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<option value="a5">A5 (fast)</option>
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</select>
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<label>Resolution </label>
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<select id="resolution">
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<option value="72">72 dpi (fast)</option>
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<option value="150">150 dpi</option>
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<option value="200" selected>200 dpi</option>
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<option value="300">300 dpi (slow)</option>
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</select>
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<label>Scale </label>
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<select id="scale">
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<option value="500">1:500000</option>
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<option value="250" selected>1:250000</option>
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<option value="100">1:100000</option>
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<option value="50">1:50000</option>
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<option value="25">1:25000</option>
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<option value="10">1:10000</option>
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</select>
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</form>
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<button id="export-pdf">Export PDF</button>
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132
examples/print-to-scale.js
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examples/print-to-scale.js
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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, ScaleLine} from '../src/ol/control.js';
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import WMTSCapabilities from '../src/ol/format/WMTSCapabilities.js';
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import TileLayer from '../src/ol/layer/Tile.js';
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import {get as getProjection, getPointResolution} from '../src/ol/proj.js';
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import {register} from '../src/ol/proj/proj4.js';
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import WMTS, {optionsFromCapabilities} from '../src/ol/source/WMTS.js';
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import proj4 from 'proj4';
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import {toJpeg} from 'html-to-image';
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proj4.defs('EPSG:27700', '+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 ' +
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'+x_0=400000 +y_0=-100000 +ellps=airy ' +
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'+towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 ' +
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'+units=m +no_defs');
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register(proj4);
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const proj27700 = getProjection('EPSG:27700');
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proj27700.setExtent([0, 0, 700000, 1300000]);
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const raster = new TileLayer();
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const url = 'https://tiles.arcgis.com/tiles/qHLhLQrcvEnxjtPr/arcgis/rest/services/OS_Open_Raster/MapServer/WMTS';
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fetch(url)
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.then(function(response) {
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return response.text();
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})
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.then(function(text) {
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const result = new WMTSCapabilities().read(text);
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const options = optionsFromCapabilities(result, {
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layer: 'OS_Open_Raster'
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});
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options.attributions = 'Contains OS data © Crown Copyright and database right ' + new Date().getFullYear();
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options.crossOrigin = '';
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options.projection = proj27700;
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options.wrapX = false;
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raster.setSource(new WMTS(options));
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});
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const map = new Map({
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layers: [raster],
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controls: defaultControls({
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attributionOptions: {collapsible: false}
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}),
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target: 'map',
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view: new View({
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center: [373500, 436500],
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projection: proj27700,
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zoom: 7
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})
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});
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const scaleLine = new ScaleLine({bar: true, text: true});
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map.addControl(scaleLine);
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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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// export options for html-to-image.
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// See: https://github.com/bubkoo/html-to-image#options
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const exportOptions = {
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filter: function(element) {
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const className = element.className || '';
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return (
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className.indexOf('ol-control') === -1 ||
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className.indexOf('ol-scale') > -1 ||
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(className.indexOf('ol-attribution') > -1 &&
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className.indexOf('ol-uncollapsible'))
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);
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}
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};
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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 scale = document.getElementById('scale').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 viewResolution = map.getView().getResolution();
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const scaleResolution = scale / getPointResolution(
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map.getView().getProjection(),
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resolution / 25.4,
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map.getView().getCenter()
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);
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map.once('rendercomplete', function() {
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exportOptions.width = width;
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exportOptions.height = height;
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toJpeg(map.getViewport(), exportOptions).then(function(dataUrl) {
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const pdf = new jsPDF('landscape', undefined, format);
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pdf.addImage(dataUrl, 'JPEG', 0, 0, dim[0], dim[1]);
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pdf.save('map.pdf');
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// Reset original map size
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scaleLine.setDpi();
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scaleLine.setMinWidth();
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map.getTargetElement().style.width = '';
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map.getTargetElement().style.height = '';
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map.updateSize();
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map.getView().setResolution(viewResolution);
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exportButton.disabled = false;
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document.body.style.cursor = 'auto';
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});
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});
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// Set print size
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scaleLine.setDpi(resolution);
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scaleLine.setMinWidth(resolution * 4 / 2.54); // 4cm
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map.getTargetElement().style.width = width + 'px';
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map.getTargetElement().style.height = height + 'px';
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map.updateSize();
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map.getView().setResolution(scaleResolution);
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}, false);
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