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Copy pathbaidumap_geohash_explorer.html
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baidumap_geohash_explorer.html
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
<script type="text/javascript"
src="http://api.map.baidu.com/api?v=3.0&ak=xxxxxxxxx"></script>
<style type="text/css">
body, html {
width: 100%;
height: 100%;
margin: 0;
font-family: "微软雅黑";
}
#allmap {
width: 100%;
height: 500px;
overflow: hidden;
}
#result {
width: 100%;
font-size: 12px;
}
ul, li {
margin: 0;
padding: 0;
list-style: none;
}
p {
font-size: 12px;
}
li {
line-height: 28px;
}
fieldset {
margin: 20px;
border: 1px solid #666;
border-radius: 8px;
box-shadow: 0 0 10px #666;
padding: 10px;
}
legend {
padding: 2px 4px;
background: #fff;
}
fieldset > legend {
float: left;
margin-top: -20px;
}
fieldset > legend + * {
clear: both;
}
</style>
<title>BaiduMap Geohash Explorer</title>
</head>
<body>
<div id="allmap" style="overflow:hidden;zoom:1;position:relative;">
<div id="map" style="height:100%;-webkit-transition: all 0.5s ease-in-out;transition: all 0.5s ease-in-out;"></div>
</div>
<form style="width:fit-content;position:absolute;left:5px;top:10px">
<fieldset>
<legend>Geohash Explorer</legend>
<ul>
<li>
<label for="lon">经度：</label>
<input type="number" name="lon" id="lon" class="latlon" placeholder="longitude e.g. 104.0638546" title="Longitude">
</li>
<li>
<label for="lat">纬度：</label>
<input type="text" name="lat" id="lat" class="latlon" placeholder="latitude e.g. 30.6599157" title="Latitude">
</li>
<li>
<label for="precision">Geohash 长度：</label>
<select name="precision" id="precision" class="latlon">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
</select>
</li>
<li>
<label for="geohash">Geohash: </label>
<input type="text" name="geohash" id="geohash">
</li>
<li>
<label for="mark-neighbours">标注相邻区域：</label>
<input name="mark-neighbours" id="mark-neighbours" type="checkbox">
</li>
</ul>
</fieldset>
</form>
<div>
<p>当前鼠标单击获取的经纬度：<span id="current-lon-lat" style="font-weight:bold"></span></p>
</div>
<div style="color:green">
<p>经度 + 纬度 + Geohash长度 => Geohash</p>
<p>Geohash => 经度 + 纬度 + Geohash长度</p>
</div>
</body>
<script type="module">
import Geohash from "https://cdn.jsdelivr.net/gh/chrisveness/latlon-geohash/latlon-geohash.js";
// 百度地图API功能
const map = new BMap.Map('map');
// map.centerAndZoom("成都", 1);
map.enableScrollWheelZoom();
map.disableDoubleClickZoom();
//单击获取经纬度
map.addEventListener("click", function (e) {
document.querySelector("#current-lon-lat").innerHTML = "{longitude: " + e.point.lng + ", latitude: " + e.point.lat + "}";
});
var overlays = [];
// 根据点的数组自动调整缩放级别
function setZoom(points) {
const viewport = map.getViewport(eval(points));
const mapZoom = viewport.zoom;
const centerPoint = viewport.center;
map.centerAndZoom(centerPoint, mapZoom);
}
function cleanOverlays(overlays) {
for (let i = 0; i < overlays.length; i++) {
map.removeOverlay(overlays[i]);
}
}
function drawCell(geohash) {
const bounds = Geohash.bounds(geohash);
let boundPoints = [
new BMap.Point(bounds.sw.lon, bounds.sw.lat),
new BMap.Point(bounds.sw.lon, bounds.ne.lat),
new BMap.Point(bounds.ne.lon, bounds.ne.lat),
new BMap.Point(bounds.ne.lon, bounds.sw.lat)
];
const polygon = new BMap.Polygon(boundPoints, {strokeColor: "blue", strokeWeight: 4});
map.addOverlay(polygon);
overlays.push(polygon);
let latLon = Geohash.decode(geohash);
let centre = new BMap.Point(latLon.lon, latLon.lat);
const label = new BMap.Label(geohash, {
position: centre,
offset: new BMap.Size(0, 0)
});
label.setStyle({
color: "#000",
border: "0px",
backgroundColor: "0.000000000001",
fontSize: "12px",
height: "20px",
lineHeight: "20px",
transform: 'translateX(-50%)'
});
map.addOverlay(label);
overlays.push(label);
return boundPoints;
}
function drawNeighbours(geohash) {
let boundPoints = [];
const neighbours = Geohash.neighbours(geohash);
boundPoints = boundPoints.concat(drawCell(neighbours.e));
boundPoints = boundPoints.concat(drawCell(neighbours.w));
boundPoints = boundPoints.concat(drawCell(neighbours.s));
boundPoints = boundPoints.concat(drawCell(neighbours.n));
boundPoints = boundPoints.concat(drawCell(neighbours.se));
boundPoints = boundPoints.concat(drawCell(neighbours.sw));
boundPoints = boundPoints.concat(drawCell(neighbours.ne));
boundPoints = boundPoints.concat(drawCell(neighbours.nw));
return boundPoints;
}
document.addEventListener('DOMContentLoaded', function(event) {
document.querySelectorAll('#lat,#lon,#mark-neighbours').forEach(input => input.onchange = function() {
cleanOverlays(overlays);
// encode geohash
try {
const lat = document.querySelector('#lat').value;
const lon = document.querySelector('#lon').value;
const precision = document.querySelector('#precision').value;
const geohash = Geohash.encode(lat, lon, precision);
const markNeighbours = document.querySelector("#mark-neighbours").checked;
document.querySelector('#geohash').value = geohash;
let boundPoints = drawCell(geohash);
if (markNeighbours) {
boundPoints = boundPoints.concat(drawNeighbours(geohash));
}
setZoom(boundPoints);
} catch (err) { console.log(err); }
});
document.querySelector('#precision').onchange = function() {
cleanOverlays(overlays);
// encode geohash & reset lat/lon to reflect new precision
try {
const lat = document.querySelector('#lat').value;
const lon = document.querySelector('#lon').value;
const precision = document.querySelector('#precision').value;
const geohash = Geohash.encode(lat, lon, precision);
const markNeighbours = document.querySelector("#mark-neighbours").checked;
const latlon = Geohash.decode(geohash);
document.querySelector('#lat').value = latlon.lat;
document.querySelector('#lon').value = latlon.lon;
document.querySelector('#geohash').value = geohash;
var boundPoints = drawCell(geohash);
if (markNeighbours) {
boundPoints = boundPoints.concat(drawNeighbours(geohash));
}
setZoom(boundPoints);
} catch (err) { console.log(err); }
};
document.querySelector('#geohash').onchange = function() {
cleanOverlays(overlays);
// decode geohash
const geohash = document.querySelector('#geohash').value.replace(/\W/g, '');
const markNeighbours = document.querySelector("#mark-neighbours").checked;
const latlon = Geohash.decode(geohash);
document.querySelector('#lat').value = latlon.lat;
document.querySelector('#lon').value = latlon.lon;
document.querySelector('#precision').value = document.querySelector('#geohash').value.length;
let boundPoints = drawCell(geohash);
if (markNeighbours) {
boundPoints = boundPoints.concat(drawNeighbours(geohash));
}
setZoom(boundPoints);
};
document.querySelector('#lon').value = 104;
document.querySelector('#lat').value = 30;
document.querySelector('#precision').value = 3;
document.querySelector('#precision').onchange();
});
</script>
</html>