[GitHub] [incubator-echarts] liiiku commented on issue #3899: 世界地图的视图中心点可以定制吗

[GitBox <gi...@apache.org>]

liiiku commented on issue #3899: 世界地图的视图中心点可以定制吗
URL: https://github.com/apache/incubator-echarts/issues/3899#issuecomment-500449883
 
 
   将以非洲为中心的geojson改成以亚洲为中心的geojson，方法如下：
   
   ```
   // 对纬度进行偏移
   const processLng = lng => {
       return lng > -30 ? lng - 150 : lng + 210
   }
   
   //引入世界地图
   import worldMap from '../data/world.json'
   
   const coordinatesList = []
   
   // 对世界地图的json文件中的经纬度坐标进行处理
   worldMap.features.map(district => {
       if (district.geometry.type == 'Polygon') {
         district.geometry.coordinates.map(border => {
           border.map(coord => {
             coord[0] = processLng(coord[0])
             coordinatesList.push(coord)
           })
         })
     } else {
         district.geometry.coordinates.map(border => {
           border.map(coordinates => {
             coordinates.map(coord => {
               coord[0] = processLng(coord[0])
               coordinatesList.push(coord)
             })
           })
         })
       }
     })
   ```
   这样世界地图的效果变成了期望的效果：
   ![world](https://user-images.githubusercontent.com/21993582/59204674-b3a7f500-8bd3-11e9-9f90-48a05e4d2a4d.jpg)
   
   
   
   

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