openlayer 绘制和修改要素
绘制和修改要素
<!DOCTYPE html><html>
<head>
<title>Draw and Modify Features</title>
<link rel=”stylesheet“ href=”https://openlayers.org/en/v5.1.3/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>
</head>
<body>
<div id=”map“ class=”map“></div>
<form class=”form-inline“>
<label>Geometry type </label>
<select id=”type“>
<option value=”Point“>Point</option>
<option value=”LineString“>LineString</option>
<option value=”Polygon“>Polygon</option>
<option value=”Circle“>Circle</option>
</select>
</form>
<script>
import Map from ‘ol/Map.js’;
import View from ‘ol/View.js’;
import {Draw, Modify, Snap} from ‘ol/interaction.js’;
import {Tile as TileLayer, Vector as VectorLayer} from ‘ol/layer.js’;
import {OSM, Vector as VectorSource} from ‘ol/source.js’;
import {Circle as CircleStyle, Fill, Stroke, Style} from ‘ol/style.js’;
var raster = new TileLayer({
source: new OSM()
});
var source = new VectorSource();
var vector = new VectorLayer({
source: source,
style: new Style({
fill: new Fill({
color: ‘rgba(255, 255, 255, 0.2)’
}),
stroke: new Stroke({
color: ‘#ffcc33’,
width: 2
}),
image: new CircleStyle({
radius: 7,
fill: new Fill({
color: ‘#ffcc33’
})
})
})
});
var map = new Map({
layers: [raster, vector],
target: ‘map’,
view: new View({
center: [–11000000, 4600000],
zoom: 4
})
});
var modify = new Modify({source: source});
map.addInteraction(modify);
var draw, snap; // global so we can remove them later
var typeSelect = document.getElementById(‘type’);
function addInteractions() {
draw = new Draw({
source: source,
type: typeSelect.value
});
map.addInteraction(draw);
snap = new Snap({source: source});
map.addInteraction(snap);
}
/**
* Handle change event.
*/
typeSelect.onchange = function() {
map.removeInteraction(draw);
map.removeInteraction(snap);
addInteractions();
};
addInteractions();
</script>
</body></html>
转载自：https://blog.csdn.net/qq_36178899/article/details/81213415
