三章-19-鼠标位置控件
2020-04-20 本文已影响0人
彩云飘过
本文基于腾讯课堂老胡的课《跟我学Openlayers--基础实例详解》做的学习笔记，使用的openlayers 5.3.x api。
源码 见 1019.html ，对应的 官网示例 https://openlayers.org/en/latest/examples/overviewmap.html?q=OverviewMap
image.png
效果图
<!DOCTYPE html>
<html>
<head>
<title>鼠标位置控件
</title>
<link rel="stylesheet" href="../include/ol.css" type="text/css">
<script src="../include/ol.js"></script>
</head>
<style>
</style>
<body>
<div id="mouse-position"></div>
<form>
<label>投影 </label>
<select id="projection">
<option value="EPSG:4326">EPSG:4326</option>
<option value="EPSG:3857">EPSG:3857</option>
</select>
<label>精度 </label>
<input id="precision" type="number" min="0" max="12" value="4" />
</form>
<div id="map" class="map"></div>
<script>
var mousePositionControl = new ol.control.MousePosition({
coordinateFormat: ol.coordinate.createStringXY(4),//坐标精度设置
projection: 'EPSG:4326',//投影坐标系
target: document.getElementById('mouse-position'), //绑定到自定义的DOM对象
});
var map = new ol.Map({
controls: ol.control.defaults().extend([mousePositionControl]),
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
})
],
target: 'map',
view: new ol.View({
center: [0, 0],
zoom: 2
})
});
var projectionSelect = document.getElementById('projection');
projectionSelect.addEventListener('change', function (event) {
mousePositionControl.setProjection(event.target.value);
});
var precisionInput = document.getElementById('precision');
precisionInput.addEventListener('change', function (event) {
var format = ol.coordinate.createStringXY(event.target.valueAsNumber);
mousePositionControl.setCoordinateFormat(format);
});
</script>
</body>
</html>
