From b46c38626bbd6d35d7f8f95d4cb78057046f5f8b Mon Sep 17 00:00:00 2001 From: Tom Payne Date: Sun, 10 Nov 2013 01:41:56 +0100 Subject: [PATCH] Add synthetic data example --- examples/synthetic-data.html | 50 ++++++++++++++++++++++++++ examples/synthetic-data.js | 69 ++++++++++++++++++++++++++++++++++++ 2 files changed, 119 insertions(+) create mode 100644 examples/synthetic-data.html create mode 100644 examples/synthetic-data.js diff --git a/examples/synthetic-data.html b/examples/synthetic-data.html new file mode 100644 index 0000000000..5cb953179f --- /dev/null +++ b/examples/synthetic-data.html @@ -0,0 +1,50 @@ + + + + + + + + + + + Synthetic data example + + + +
+
+
+ OpenLayers 3 Examples +
+
+
+ +
+ +
+
+
+
+
+ +
+ +
+

Synthetic data example

+

Synthetic data example.

+
+

See the synthetic-data.js source to see how this is done.

+
+
vector
+
+ +
+ +
+ + + + + + diff --git a/examples/synthetic-data.js b/examples/synthetic-data.js new file mode 100644 index 0000000000..86023728e0 --- /dev/null +++ b/examples/synthetic-data.js @@ -0,0 +1,69 @@ +goog.require('goog.functions'); +goog.require('ol.Map'); +goog.require('ol.Overlay'); +goog.require('ol.RendererHint'); +goog.require('ol.View2D'); +goog.require('ol.format.GeoJSON'); +goog.require('ol.layer.Vector'); +goog.require('ol.source.Vector'); +goog.require('ol.symbol'); + + +// build up some GeoJSON features +var count = 20000; +var features = new Array(count); +var e = 18000000; +for (var i = 0; i < count; ++i) { + features[i] = { + type: 'Feature', + properties: { + i: i, + size: i % 2 ? 10 : 20 + }, + geometry: { + type: 'Point', + coordinates: [ + 2 * e * Math.random() - e, 2 * e * Math.random() - e + ] + } + }; +} + +var vectorSource = new ol.source.Vector(); +new ol.format.GeoJSON().readObject({ + type: 'FeatureCollection', + features: features +}, vectorSource.addFeature, vectorSource); + +var styleFunction = goog.functions.constant({ + image: ol.symbol.renderCircle( + 5, + { + color: '#666666' + }, + { + color: '#bada55', + width: 1 + }) +}); + + +var vector = new ol.layer.Vector({ + source: vectorSource, + styleFunction: styleFunction +}); + +var popup = new ol.Overlay({ + element: document.getElementById('popup') +}); + +var map = new ol.Map({ + layers: [vector], + renderer: ol.RendererHint.CANVAS, + target: 'map', + view: new ol.View2D({ + center: [0, 0], + zoom: 2 + }), + overlays: [popup] +});