我正在尝试找到一种解决方案来创建具有开放层的 pdf 文件。
我有一个包含使用 openlayers 创建的 WMTS 图 block 的 div，我想用它为我的用户创建一个 pdf 文件。我曾尝试通过互联网探索，但没有找到解决方案。
<body>
<div id="mapContainer" />
</body>
在 mapContainer 中，将创建我所有的 openlayers WMTS 瓦片，我需要使用这些瓦片创建一个 pdf 文件，该文件将直接下载到用户 PC 中。
我用过window.print()较早，但它正在 chop 一些用户可见的 map 数据。请提供任何可能的解决方案。
最佳答案
我记得Openlayers3提供了打印PDF的例子(Export PDF example)。
<!DOCTYPE html>
<html>
<head>
<title>Export PDF example</title>
<link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v3.20.1/build/ol.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.2.61/jspdf.min.js"></script>
<style>
.map {
max-width: 566px;
}
</style>
</head>
<body>
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
</div>
</div>
<form class="form">
<label>Page size </label>
<select id="format">
<option value="a0">A0 (slow)</option>
<option value="a1">A1</option>
<option value="a2">A2</option>
<option value="a3">A3</option>
<option value="a4" selected>A4</option>
<option value="a5">A5 (fast)</option>
</select>
<label>Resolution </label>
<select id="resolution">
<option value="72">72 dpi (fast)</option>
<option value="150">150 dpi</option>
<option value="300">300 dpi (slow)</option>
</select>
</form>
<button id="export-pdf">Export PDF</button>
<script>
var raster = new ol.layer.Tile({
source: new ol.source.OSM()
});
var format = new ol.format.WKT();
var 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');
var vector = new ol.layer.Vector({
source: new ol.source.Vector({
features: [feature]
})
});
var map = new ol.Map({
layers: [raster, vector],
target: 'map',
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}),
view: new ol.View({
center: [0, 0],
zoom: 2
})
});
var dims = {
a0: [1189, 841],
a1: [841, 594],
a2: [594, 420],
a3: [420, 297],
a4: [297, 210],
a5: [210, 148]
};
var loading = 0;
var loaded = 0;
var exportButton = document.getElementById('export-pdf');
exportButton.addEventListener('click', function() {
exportButton.disabled = true;
document.body.style.cursor = 'progress';
var format = document.getElementById('format').value;
var resolution = document.getElementById('resolution').value;
var dim = dims[format];
var width = Math.round(dim[0] * resolution / 25.4);
var height = Math.round(dim[1] * resolution / 25.4);
var size = /** @type {ol.Size} */ (map.getSize());
var extent = map.getView().calculateExtent(size);
var source = raster.getSource();
var tileLoadStart = function() {
++loading;
};
var tileLoadEnd = function() {
++loaded;
if (loading === loaded) {
var canvas = this;
window.setTimeout(function() {
loading = 0;
loaded = 0;
var data = canvas.toDataURL('image/png');
var pdf = new jsPDF('landscape', undefined, format);
pdf.addImage(data, 'JPEG', 0, 0, dim[0], dim[1]);
pdf.save('map.pdf');
source.un('tileloadstart', tileLoadStart);
source.un('tileloadend', tileLoadEnd, canvas);
source.un('tileloaderror', tileLoadEnd, canvas);
map.setSize(size);
map.getView().fit(extent, size);
map.renderSync();
exportButton.disabled = false;
document.body.style.cursor = 'auto';
}, 100);
}
};
map.once('postcompose', function(event) {
source.on('tileloadstart', tileLoadStart);
source.on('tileloadend', tileLoadEnd, event.context.canvas);
source.on('tileloaderror', tileLoadEnd, event.context.canvas);
});
map.setSize([width, height]);
map.getView().fit(extent, /** @type {ol.Size} */ (map.getSize()));
map.renderSync();
}, false);
</script>
</body>
</html>关于javascript - 如何使用 openlayers div 创建 pdf 文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41197979/