OpenLayers示例代码：箭线
OpenLayers示例代码：箭线
<!DOCTYPE html>
<html>
<head>
<title>LineString Arrows</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 raster = new ol.layer.Tile({
source: new ol.source.OSM()
});
var source = new ol.source.Vector();
var styleFunction = function(feature) {
var geometry = feature.getGeometry();
var styles = [
// linestring
new ol.style.Style({
stroke: new ol.style.Stroke({
color: '#ffcc33',
width: 2
})
})
];
geometry.forEachSegment(function(start, end) {
var dx = end[0] - start[0];
var dy = end[1] - start[1];
var rotation = Math.atan2(dy, dx);
// arrows
styles.push(new ol.style.Style({
geometry: new ol.geom.Point(end),
image: new ol.style.Icon({
src: 'https://openlayers.org/en/v4.0.1/examples/data/arrow.png',
anchor: [0.75, 0.5],
rotateWithView: true,
rotation: -rotation
})
}));
});
return styles;
};
var vector = new ol.layer.Vector({
source: source,
style: styleFunction
});
var map = new ol.Map({
layers: [raster, vector],
target: 'map',
view: new ol.View({
center: [-11000000, 4600000],
zoom: 4
})
});
map.addInteraction(new ol.interaction.Draw({
source: source,
type: /** @type {ol.geom.GeometryType} */ ('LineString')
}));
</script>
</body>
</html>
说明：
OpenLayers示例代码：箭线
