pissang opened a new pull request #13271:
URL: https://github.com/apache/incubator-echarts/pull/13271


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   ## Brief Information
   
   This pull request is in the type of:
   
   - [ ] bug fixing
   - [x] new feature
   - [ ] others
   
   
   
   ### What does this PR do?
   
   In the previous custom series. We can't do animation across different types 
of shapes. For example, we can't animate from a sector to a rectangle. In this 
PR, we bring the ability to do smooth shape morphing across different shapes.
   
   An example of the transition between `map`, `bar`, `bubble` and `pie`(These 
are all implemented by custom series.)
   ![Screen Recording 2020-09-13 at 10 27 04 
PM](https://user-images.githubusercontent.com/841551/93020799-df552e80-f611-11ea-9d3b-1d28912b3dc5.gif)
   
   
   
   ## Usage
   
   ### Are there any API changes?
   
   We add a boolean property called `shapeMorphing` in the returned element 
option in `renderItem`. With it enabled, the shape will be morphed from the 
previous shape smoothly when the type is changed.
   
   For example:
   ```js
   // Render as rectangle at first time.
   renderItem(params, api) {
     return {
        type: 'rect'
        ....
      }
   }
   // Change to a circle.
   renderItem(params, api) {
     return {
        type: 'circle',
        // Enable morphing from the previous rectangle.
        shapeMorphing: true
        ....
      }
   }
   ```


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