前言
官网指引,生成accesstoken,下载相关依赖请翻阅[https://blog.csdn.net/weixin_44402694/article/details/125414381?spm=1001.2014.3001.5501](https://blog.csdn.net/weixin_44402694/article/details/125414381?spm=1001.2014.3001.5501)
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mapbox根据指定中心点绘制指定公里数的矩形
效果
代码实现
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>22、根据指定中心点获取指定公里数的矩形</title>
<link
href="https://api.mapbox.com/mapbox-gl-js/v2.7.0/mapbox-gl.css"
rel="stylesheet"
/>
<script src="https://api.mapbox.com/mapbox-gl-js/v2.7.0/mapbox-gl.js"></script>
<script src="https://unpkg.com/@turf/turf/turf.min.js"></script>
<style>
* {
padding: 0;
margin: 0;
list-style: none;
text-decoration: none;
}
html,
body {
width: 100%;
height: 100%;
}
#map {
width: 100%;
height: 100%;
}
.btn-list {
position: fixed;
top: 100px;
left: 100px;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
mapboxgl.accessToken =
'pk.eyJ1Ijoid2FuZ3Rvbmd4dWUiLCJhIjoiY2pzY3E2M2k0MDk3NzN5dDA0Nmtia2h0cCJ9.oP9fEJxOgVzm0dWGvL6tGg'
const map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [108, 35],
zoom: 4,
})
map.on('load', () => {
drawRectangle()
})
function drawRectangle() {
const point = [108, 35]
const lineGeoJson = {
type: 'FeatureCollection',
features: [this.getRectLatLngHandler(point)],
}
map.addSource('circle', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
properties: { size: 5, color: 'red' },
geometry: { type: 'Point', coordinates: [108, 35] },
},
],
},
})
map.addLayer({
id: 'circle',
type: 'circle',
source: 'circle',
paint: {
'circle-radius': ['get', 'size'],
'circle-color': ['get', 'color'],
'circle-opacity': 1,
'circle-stroke-color': 'red',
'circle-stroke-opacity': 1,
},
})
map.addSource('line', {
type: 'geojson',
data: lineGeoJson,
})
map.addLayer({
id: 'line',
type: 'line',
source: 'line',
paint: {
'line-color': 'red',
'line-width': 1,
'line-opacity': 1,
},
})
}
function getRectLatLngHandler(latlng) {
const rectWidth = 1500 / 2
const rectHeight = 1000 / 2
const center = latlng
const maxRadius = rectWidth
const minRadius = rectHeight
const options = {
steps: 4,
units: 'kilometers',
}
const maxCircle = turf.circle(center, maxRadius, options)
const minCircle = turf.circle(center, minRadius, options)
const leftLon = maxCircle.geometry.coordinates[0][1][0]
const rightLon = maxCircle.geometry.coordinates[0][3][0]
const topLat = minCircle.geometry.coordinates[0][0][1]
const bottomLat = minCircle.geometry.coordinates[0][2][1]
return {
type: 'Feature',
geometry: {
type: 'Polygon',
coordinates: [
[
[leftLon, topLat],
[rightLon, topLat],
[rightLon, bottomLat],
[leftLon, bottomLat],
[leftLon, topLat],
],
],
},
}
}
</script>
</body>
</html>
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