<!DOCTYPE html> <html> <head> <title>Vector Layer</title> <link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css"> <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --> <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script> <script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script> </head> <body> <div id="map" class="map"></div> <div id="info"> </div> <script> var style = new ol.style.Style({ fill: new ol.style.Fill({ color: 'rgba(255, 255, 255, 0.6)' }), stroke: new ol.style.Stroke({ color: '#319FD3', width: 1 }), text: new ol.style.Text({ font: '12px Calibri,sans-serif', fill: new ol.style.Fill({ color: '#000' }), stroke: new ol.style.Stroke({ color: '#fff', width: 3 }) }) }); var vectorLayer = new ol.layer.Vector({ source: new ol.source.Vector({ url: 'https://openlayers.org/en/v4.0.1/examples/data/geojson/countries.geojson', format: new ol.format.GeoJSON() }), style: function(feature, resolution) { style.getText().setText(resolution < 5000 ? feature.get('name') : ''); return style; } }); var map = new ol.Map({ layers: [ new ol.layer.Tile({ source: new ol.source.OSM() }), vectorLayer ], target: 'map', view: new ol.View({ center: [0, 0], zoom: 1 }) }); var highlightStyleCache = {}; var featureOverlay = new ol.layer.Vector({ source: new ol.source.Vector(), map: map, style: function(feature, resolution) { var text = resolution < 5000 ? feature.get('name') : ''; if (!highlightStyleCache[text]) { highlightStyleCache[text] = new ol.style.Style({ stroke: new ol.style.Stroke({ color: '#f00', width: 1 }), fill: new ol.style.Fill({ color: 'rgba(255,0,0,0.1)' }), text: new ol.style.Text({ font: '12px Calibri,sans-serif', text: text, fill: new ol.style.Fill({ color: '#000' }), stroke: new ol.style.Stroke({ color: '#f00', width: 3 }) }) }); } return highlightStyleCache[text]; } }); var highlight; var displayFeatureInfo = function(pixel) { var feature = map.forEachFeatureAtPixel(pixel, function(feature) { return feature; }); var info = document.getElementById('info'); if (feature) { info.innerHTML = feature.getId() + ': ' + feature.get('name'); } else { info.innerHTML = ' '; } if (feature !== highlight) { if (highlight) { featureOverlay.getSource().removeFeature(highlight); } if (feature) { featureOverlay.getSource().addFeature(feature); } highlight = feature; } }; map.on('pointermove', function(evt) { if (evt.dragging) { return; } var pixel = map.getEventPixel(evt.originalEvent); displayFeatureInfo(pixel); }); map.on('click', function(evt) { displayFeatureInfo(evt.pixel); }); </script> </body> </html>
OpenLayers示例代码:矢量图层
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