[GitHub] tangqinGiser opened a new issue #8116: 大数据图层无法显示tooltip提示框，LargeLineShape.findDataIndex()因参数缺失无法返回dataIndex.

[GitBox]

tangqinGiser opened a new issue #8116: 
大数据图层无法显示tooltip提示框，LargeLineShape.findDataIndex()因参数缺失无法返回dataIndex.
URL: https://github.com/apache/incubator-echarts/issues/8116
 
 
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   ### One-line summary [问题简述]
   当前用最新版的echarts创建一个大数据图层，尝试添加 tooltip 
一直没显示，跟代码到LargeLineShape.findDataIndex()，因参数确实无法返回 
dataIndex，尝试补足参数后成功显示tooltip。请问是否为echarts缺陷？
   
   
   ### ECharts option [ECharts配置项]
   <!-- Copy and paste your 'echarts option' here. -->
   <!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
   ```javascript
   option = {
           animation: false,
           progressive: 20000,
           GLMap: {
               roam: true
           },
           title: {
               text: '北京道路网络图',
               subtext: '200万数据点绘制',
               left: 'center',
               textStyle: {
                   color: '#fff'
               }
           },
           tooltip: {
               trigger: 'item',
           },
           coordinateSystem: 'GLMap',
           series: [{
               name: 'beijingRoads',
               type: 'lines',
               blendMode: 'lighter',
               coordinateSystem: 'GLMap',
   
               dimensions: ['value'],
               zlevel: 1,
               data: new Float64Array(),
               polyline: true,
               large: true,
   
               lineStyle: {
                   color: 'orange',
                   width: 2,
                   opacity: 0.3
               },
               tooltip: {
                   trigger: 'item',
                   formatter: function (params, ticket, callback) {
                       map.getCanvas().style.cursor = 'pointer';
                       return '第' + params.dataIndex + '个数据。';
                   }
               },
           }]
   
   ```
   
   
   
   
   ### Other comments [其他信息]
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   <!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->
   
![image](https://user-images.githubusercontent.com/30792630/38476069-87ace820-3bde-11e8-8093-199bc30fcf8c.png)
   
   
![image](https://user-images.githubusercontent.com/30792630/38476045-5f1ebb90-3bde-11e8-989a-1fb266bb5b60.png)
   
   

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