【MAPBOX基础功能】21、mapbox绘制自动旋转的图标

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)
本文使用官网accesstoken，请自行生成私人token
mapbox绘制自动旋转的图标
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前置图片

在这里插入图片描述

效果

在这里插入图片描述

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>21、绘制自动旋转的图标</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>
    <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', // 容器 id
        style: 'mapbox://styles/mapbox/streets-v11', // mapbox底图
        center: [108, 35], // 初始化中心点
        zoom: 4, // 初始化层级
      })
      map.on('load', () => {
        addRotateIcon()
      })

      function addRotateIcon() {
        map.addImage(
          'rotate-img',
          this.createRotateIconByStaticDiagram('./img/typhoon.png')
        )
        map.addSource('rotate', {
          type: 'geojson',
          data: {
            type: 'FeatureCollection',
            features: [
              {
                type: 'Feature',
                geometry: { type: 'Point', coordinates: [114, 35] },
              },
            ],
          },
        })
        map.addLayer({
          id: 'rotate',
          type: 'symbol',
          source: 'rotate',
          layout: {
            'icon-image': 'rotate-img',
            'icon-size': 1,
            'icon-offset': [0, 0],
            'icon-rotation-alignment': 'map',
            'icon-allow-overlap': true,
            'icon-ignore-placement': true,
          },
        })
      }
      // 传入一个png图片 创建一个动态图标
      function createRotateIconByStaticDiagram(url) {
        const size = 40
        return {
          width: size,
          height: size,
          data: new Uint8Array(size * size * 4),
          onAdd: function () {
            const canvas = document.createElement('canvas')
            canvas.width = this.width
            canvas.height = this.height
            this.context = canvas.getContext('2d')
          },
          render: function () {
            const context = this.context
            context.clearRect(0, 0, this.width, this.height)
            const img = new Image()
            img.src = url
            context.drawImage(img, 0, 0)
            img.onload = function () {
              context.clearRect(0, 0, 40, 40)
              context.translate(20, 20)
              context.rotate(Math.PI / 45)
              context.translate(-20, -20)
              context.drawImage(img, 0, 0)
            }
            this.data = context.getImageData(0, 0, this.width, this.height).data
            map.triggerRepaint()
            return true
          },
        }
      }
    </script>
  </body>
</html>

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原文地址：https://blog.csdn.net/weixin_44402694/article/details/125421271