[GitHub] [echarts] gabrielnemeth opened a new issue, #17666: [Feature] display the data from overlapping polygons on the map in tooltip

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

gabrielnemeth opened a new issue, #17666:
URL: https://github.com/apache/echarts/issues/17666

   ### What problem does this feature solve?
   
   Sometimes it makes sense to display data from polygons that are covered by other polygons.
   
   ![image](https://user-images.githubusercontent.com/11211316/190894453-ea040173-c07f-4ae5-bcc8-999a9e2b6606.png)
   
   In the example above I wanted to display data in the tooltip for the covered polygon as well since the user is pointing to a place which is intersected by both of the polygons. The problem is I get only the hovered items data into the formatter tooltip callback.
   
   Here is a link for a simple example: https://codepen.io/gabriel-n-meth/pen/PoemodO
   
   
   ### What does the proposed API look like?
   
   Example tooltip option:
   
   ```
   tooltip: {
      trigger: 'item',
      passthrough: true
   }
   ```
   
   By setting the `passThrough` flag to `true`, we should get a data array of all of the polygons the user is pointing to.


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