Build and parse examples from examples_src/

2015-04-01 18:22:56 +02:00
parent 2e9869057e
commit ff1ee78ddd
263 changed files with 3 additions and 3 deletions
--- a/examples_src/d3.js
+++ b/examples_src/d3.js
@@ -0,0 +1,96 @@
+// NOCOMPILE
+// this example uses d3 for which we don't have an externs file.
+goog.require('ol');
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.extent');
+goog.require('ol.layer.Image');
+goog.require('ol.layer.Tile');
+goog.require('ol.proj');
+goog.require('ol.source.ImageCanvas');
+goog.require('ol.source.Stamen');
+
+
+var map = new ol.Map({
+  layers: [
+    new ol.layer.Tile({
+      source: new ol.source.Stamen({
+        layer: 'watercolor'
+      })
+    })
+  ],
+  target: 'map',
+  view: new ol.View({
+    center: ol.proj.fromLonLat([-97, 38]),
+    zoom: 4
+  })
+});
+
+
+/**
+ * Load the topojson data and create an ol.layer.Image for that data.
+ */
+d3.json('data/topojson/us.json', function(error, us) {
+  var features = topojson.feature(us, us.objects.counties);
+
+  /**
+   * This function uses d3 to render the topojson features to a canvas.
+   * @param {ol.Extent} extent Extent.
+   * @param {number} resolution Resolution.
+   * @param {number} pixelRatio Pixel ratio.
+   * @param {ol.Size} size Size.
+   * @param {ol.proj.Projection} projection Projection.
+   * @return {HTMLCanvasElement}
+   */
+  var canvasFunction = function(extent, resolution, pixelRatio,
+      size, projection) {
+    var canvasWidth = size[0];
+    var canvasHeight = size[1];
+
+    var canvas = d3.select(document.createElement('canvas'));
+    canvas.attr('width', canvasWidth).attr('height', canvasHeight);
+
+    var context = canvas.node().getContext('2d');
+
+    var d3Projection = d3.geo.mercator().scale(1).translate([0, 0]);
+    var d3Path = d3.geo.path().projection(d3Projection);
+
+    var pixelBounds = d3Path.bounds(features);
+    var pixelBoundsWidth = pixelBounds[1][0] - pixelBounds[0][0];
+    var pixelBoundsHeight = pixelBounds[1][1] - pixelBounds[0][1];
+
+    var geoBounds = d3.geo.bounds(features);
+    var geoBoundsLeftBottom = ol.proj.transform(
+        geoBounds[0], 'EPSG:4326', projection);
+    var geoBoundsRightTop = ol.proj.transform(
+        geoBounds[1], 'EPSG:4326', projection);
+    var geoBoundsWidth = geoBoundsRightTop[0] - geoBoundsLeftBottom[0];
+    if (geoBoundsWidth < 0) {
+      geoBoundsWidth += ol.extent.getWidth(projection.getExtent());
+    }
+    var geoBoundsHeight = geoBoundsRightTop[1] - geoBoundsLeftBottom[1];
+
+    var widthResolution = geoBoundsWidth / pixelBoundsWidth;
+    var heightResolution = geoBoundsHeight / pixelBoundsHeight;
+    var r = Math.max(widthResolution, heightResolution);
+    var scale = r / (resolution / pixelRatio);
+
+    var center = ol.proj.transform(ol.extent.getCenter(extent),
+        projection, 'EPSG:4326');
+    d3Projection.scale(scale).center(center)
+        .translate([canvasWidth / 2, canvasHeight / 2]);
+    d3Path = d3Path.projection(d3Projection).context(context);
+    d3Path(features);
+    context.stroke();
+
+    return canvas[0][0];
+  };
+
+  var layer = new ol.layer.Image({
+    source: new ol.source.ImageCanvas({
+      canvasFunction: canvasFunction,
+      projection: 'EPSG:3857'
+    })
+  });
+  map.addLayer(layer);
+});