Add PDF example

config/examples-all.json

@@ -18,6 +18,7 @@
       "externs/example.js",
       "externs/fastclick.js",
       "externs/geojson.js",
+      "externs/jspdf.js",
       "externs/jquery-1.9.js",
       "externs/proj4js.js",
       "externs/tilejson.js",

examples/export-pdf.css

@@ -0,0 +1,3 @@
+.map {
+  max-width: 566px;
+}

examples/export-pdf.html

@@ -0,0 +1,33 @@
+---
+layout: example.html
+title: Export PDF example
+shortdesc: Example of exporting a map as a PDF.
+docs: >
+  Example of exporting a map as a PDF using the <a href="https://github.com/MrRio/jsPDF" target="_blank">jsPDF</a> library.
+tags: "export, pdf, openstreetmap"
+resources:
+  - http://mrrio.github.io/jsPDF/dist/jspdf.min.js
+---
+<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>

examples/export-pdf.js

@@ -0,0 +1,109 @@
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.control');
+goog.require('ol.format.WKT');
+goog.require('ol.layer.Tile');
+goog.require('ol.layer.Vector');
+goog.require('ol.source.OSM');
+goog.require('ol.source.Vector');
+
+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(e) {
+
+  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(callback) {
+    ++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);

externs/jspdf.js

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+/**
+ * @fileoverview jsPDF PDF generator.
+ * @see https://github.com/MrRio/jsPDF
+ */
+
+/**
+ * @constructor
+ * @param {string=} orientation One of `portrait` or `landscape`
+ *     (or shortcuts `p` (default), `l`).
+ * @param {string=} unit Measurement unit to be used when coordinates are specified.
+ *     One of `pt`, `mm` (default), `cm`, `in`.
+ * @param {string=} format Default: `a4`.
+ * @param {boolean=} compressPdf
+ */
+var jsPDF = function(orientation, unit, format, compressPdf) {};
+
+/**
+ * @param {string} imageData
+ * @param {string} format
+ * @param {number} x
+ * @param {number} y
+ * @param {number} w
+ * @param {number} h
+ * @param {string=} alias
+ * @param {number=} compression
+ * @return {jsPDF}
+ */
+jsPDF.prototype.addImage = function(imageData, format, x, y, w, h, alias, compression) {};
+
+/**
+ * @return {jsPDF}
+ */
+jsPDF.prototype.autoPrint = function() {};
+
+/**
+ * @param {string} type
+ * @param {Object=} options
+ * @return {jsPDF}
+ */
+jsPDF.prototype.output = function(type, options) {};
+
+/**
+ * @param {string} filename
+ * @return {jsPDF}
+ */
+jsPDF.prototype.save = function(filename) {};