[GitHub] [incubator-echarts] KrzysztofMadejski edited a comment on issue #8866: 请问如何让visual map和地图配合的时候，动态的让visual map的hover颜色也根据数据映射到某个数据区间

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

KrzysztofMadejski edited a comment on issue #8866:
URL: https://github.com/apache/incubator-echarts/issues/8866#issuecomment-689103562


   1. `areaColor: null` behavior should be documented. 
     It works if placed under `series.emphasis`
   
               series: [
               {
                   name: '香港18区人口密度',
                   mapType: 'HK', // 自定义扩展图表类型
                   emphasis: {
                       itemStyle: {
                         shadowColor: 'black',
                         shadowBlur: 5,
                         areaColor: null
                       }
                   },
   2. Does not work if placed under https://echarts.apache.org/en/option.html#geo.emphasis.itemStyle.areaColor
       Shadow can be seen, but areaColor is `yellow` still
   
           geo: {
               emphasis: {
                   itemStyle: {
                     shadowColor: 'black',
                     shadowBlur: 5,
                     areaColor: null
                   }
               }, 
               map: 'HK',
               nameMap: { .... }
            },
            series: [
               {
                   name: '香港18区人口密度',
   
   3. I'd expect full transparency to work using below code. Also with non-zero opacity to get a shading of the color below.
   
               series: [
               {
                   name: '香港18区人口密度',
                   emphasis: {
                       itemStyle: {
                         shadowColor: 'black',
                         shadowBlur: 5,
                         areaColor: '#ffffff00'
                       }
                   },
   
   I was using https://echarts.apache.org/examples/en/editor.html?c=map-HK as an example


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