129 lines
3.0 KiB
JavaScript
129 lines
3.0 KiB
JavaScript
goog.require('ol.FeatureOverlay');
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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.Tile');
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goog.require('ol.layer.Vector');
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goog.require('ol.source.GeoJSON');
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goog.require('ol.source.MapQuest');
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goog.require('ol.style.Fill');
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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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goog.require('ol.style.Text');
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var styleCache = {};
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var vectorLayer = new ol.layer.Vector({
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source: new ol.source.GeoJSON({
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url: 'data/geojson/countries.geojson'
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}),
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styleFunction: function(feature, resolution) {
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var text = resolution < 5000 ? feature.get('name') : '';
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if (!styleCache[text]) {
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styleCache[text] = [new ol.style.Style({
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fill: new ol.style.Fill({
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color: 'rgba(255, 255, 255, 0.6)'
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}),
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stroke: new ol.style.Stroke({
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color: '#319FD3',
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width: 1
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}),
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text: new ol.style.Text({
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font: '12px Calibri,sans-serif',
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text: text,
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fill: new ol.style.Fill({
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color: '#000'
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}),
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stroke: new ol.style.Stroke({
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color: '#fff',
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width: 3
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})
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})
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})];
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}
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return styleCache[text];
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}
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});
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var map = new ol.Map({
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layers: [
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new ol.layer.Tile({
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source: new ol.source.MapQuest({layer: 'sat'})
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}),
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vectorLayer
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],
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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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var highlightStyleCache = {};
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var featuresOverlay = new ol.FeatureOverlay({
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map: map,
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styleFunction: function(feature, resolution) {
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var text = resolution < 5000 ? feature.get('name') : '';
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if (!highlightStyleCache[text]) {
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highlightStyleCache[text] = [new ol.style.Style({
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stroke: new ol.style.Stroke({
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color: '#f00',
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width: 1
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}),
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fill: new ol.style.Fill({
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color: 'rgba(255,0,0,0.1)'
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}),
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text: new ol.style.Text({
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font: '12px Calibri,sans-serif',
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text: text,
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fill: new ol.style.Fill({
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color: '#000'
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}),
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stroke: new ol.style.Stroke({
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color: '#f00',
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width: 3
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})
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})
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})];
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}
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return highlightStyleCache[text];
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}
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});
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var highlight;
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var displayFeatureInfo = function(pixel) {
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var feature = map.forEachFeatureAtPixel(pixel, function(feature, layer) {
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return feature;
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});
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var info = document.getElementById('info');
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if (feature) {
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info.innerHTML = feature.getId() + ': ' + feature.get('name');
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} else {
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info.innerHTML = ' ';
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}
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if (feature !== highlight) {
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if (highlight) {
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featuresOverlay.removeFeature(highlight);
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}
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if (feature) {
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featuresOverlay.addFeature(feature);
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}
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highlight = feature;
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}
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};
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$(map.getViewport()).on('mousemove', function(evt) {
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var pixel = map.getEventPixel(evt.originalEvent);
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displayFeatureInfo(pixel);
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});
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map.on('singleclick', function(evt) {
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displayFeatureInfo(evt.pixel);
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});
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