OpenLayers示例代码：自定义控件
OpenLayers示例代码：自定义控件
<!DOCTYPE html>
<html>
<head>
<title>Custom Controls</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>
<style>
.rotate-north {
top: 65px;
left: .5em;
}
.ol-touch .rotate-north {
top: 80px;
}
</style>
</head>
<body>
<div id="map" class="map"></div>
<script>
/**
* Define a namespace for the application.
*/
window.app = {};
var app = window.app;
//
// Define rotate to north control.
//
/**
* @constructor
* @extends {ol.control.Control}
* @param {Object=} opt_options Control options.
*/
app.RotateNorthControl = function(opt_options) {
var options = opt_options || {};
var button = document.createElement('button');
button.innerHTML = 'N';
var this_ = this;
var handleRotateNorth = function() {
this_.getMap().getView().setRotation(0);
};
button.addEventListener('click', handleRotateNorth, false);
button.addEventListener('touchstart', handleRotateNorth, false);
var element = document.createElement('div');
element.className = 'rotate-north ol-unselectable ol-control';
element.appendChild(button);
ol.control.Control.call(this, {
element: element,
target: options.target
});
};
ol.inherits(app.RotateNorthControl, ol.control.Control);
//
// Create map, giving it a rotate to north control.
//
var map = new ol.Map({
controls: ol.control.defaults({
attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
collapsible: false
})
}).extend([
new app.RotateNorthControl()
]),
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
})
],
target: 'map',
view: new ol.View({
center: [0, 0],
zoom: 3,
rotation: 1
})
});
</script>
</body>
</html>
说明：
OpenLayers示例代码：自定义控件
