[GitHub] [incubator-echarts] susiwen8 opened a new pull request #12215: Feat: use auto calculate if min /max is null

[GitBox]

susiwen8 opened a new pull request #12215: Feat: use auto calculate if min /max 
is null
URL: https://github.com/apache/incubator-echarts/pull/12215
 
 
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   ## Brief Information
   
   This pull request is in the type of:
   
   - [x] bug fixing
   - [x] new feature
   - [ ] others
   
   
   
   ### What does this PR do?
   
   Use auto calculation when axis min/max's value is null
   
   ### Fixed issues
   Close #11829 
   
   ## Details
   <img width="289" alt="Screen Shot 2020-03-02 at 11 48 03" 
src="https://user-images.githubusercontent.com/20318608/75643984-b673da00-5c7b-11ea-97d4-7efae754c64d.png";>
   
   ### Before: What was the problem?
   <img width="378" alt="Screen Shot 2020-03-02 at 11 44 04" 
src="https://user-images.githubusercontent.com/20318608/75643989-bd025180-5c7b-11ea-9ed3-9c3db839b889.png";>
   
   
   ### After: How is it fixed in this PR?
   <img width="415" alt="Screen Shot 2020-03-02 at 11 43 39" 
src="https://user-images.githubusercontent.com/20318608/75644009-d1464e80-5c7b-11ea-82b5-f69b629d6c39.png";>
   
   
   
   ## Usage
   
   ### Are there any API changes?
   
   - [ ] The API has been changed.
   
   <!-- LIST THE API CHANGES HERE -->
   
   
   
   ### Related test cases or examples to use the new APIs
   
   NA.
   
   
   
   ## Others
   
   ### Merging options
   
   - [x] Please squash the commits into a single one when merge.
   
   ### Other information
   

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