cc1b70c74b
This method is an entry point for getting feature information. Renderers can use a hit canvas or defer to a layer (source) to get matching features for a pixel. For now this is only implemented for vector layers, and it uses a bbox query because we cannot refine the result because of missing geometry intersection functions yet.
72 lines
1.7 KiB
JavaScript
72 lines
1.7 KiB
JavaScript
goog.require('ol.Collection');
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goog.require('ol.Map');
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goog.require('ol.RendererHint');
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goog.require('ol.View2D');
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goog.require('ol.layer.TileLayer');
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goog.require('ol.layer.Vector');
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goog.require('ol.parser.GeoJSON');
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goog.require('ol.projection');
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goog.require('ol.source.MapQuestOpenAerial');
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goog.require('ol.source.Vector');
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goog.require('ol.style.Polygon');
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goog.require('ol.style.Rule');
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goog.require('ol.style.Style');
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var raster = new ol.layer.TileLayer({
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source: new ol.source.MapQuestOpenAerial()
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});
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var vector = new ol.layer.Vector({
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source: new ol.source.Vector({
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projection: ol.projection.get('EPSG:4326')
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}),
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style: new ol.style.Style({rules: [
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new ol.style.Rule({
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symbolizers: [
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new ol.style.Polygon({
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strokeColor: '#bada55'
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})
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]
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})
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]})
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});
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var map = new ol.Map({
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layers: new ol.Collection([raster, vector]),
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renderer: ol.RendererHint.CANVAS,
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target: 'map',
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view: new ol.View2D({
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center: [0, 0],
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zoom: 1
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})
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});
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map.on('mousemove', function(evt) {
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var features = map.getFeatureInfoForPixel(evt.getPixel(), [vector]);
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var info = [];
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for (var i = 0, ii = features.length; i < ii; ++i) {
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info.push(features[i].get('name'));
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}
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document.getElementById('map').title = info.join(', ');
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});
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var geojson = new ol.parser.GeoJSON();
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var url = 'data/countries.json';
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var xhr = new XMLHttpRequest();
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xhr.open('GET', url, true);
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/**
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* onload handler for the XHR request.
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*/
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xhr.onload = function() {
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if (xhr.status == 200) {
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// this is silly to have to tell the layer the destination projection
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var projection = map.getView().getProjection();
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vector.parseFeatures(xhr.responseText, geojson, projection);
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}
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};
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xhr.send();
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