OpenLayers示例代码：范围互动
OpenLayers示例代码：范围互动
<!DOCTYPE html>
<html>
<head>
<title>Extent Interaction</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>
<script>
var vectorSource = new ol.source.Vector({
url: 'https://openlayers.org/en/v4.0.1/examples/data/geojson/countries.geojson',
format: new ol.format.GeoJSON()
});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
new ol.layer.Vector({
source: vectorSource
})
],
target: 'map',
view: new ol.View({
center: [0, 0],
zoom: 2
})
});
var extent = new ol.interaction.Extent({
condition: ol.events.condition.platformModifierKeyOnly
});
map.addInteraction(extent);
extent.setActive(false);
//Enable interaction by holding shift
this.addEventListener('keydown', function(event) {
if (event.keyCode == 16) {
extent.setActive(true);
}
});
this.addEventListener('keyup', function(event) {
if (event.keyCode == 16) {
extent.setActive(false);
}
});
</script>
</body>
</html>
说明：
OpenLayers示例代码：范围互动
