Ovilia opened a new pull request, #20184:
URL: https://github.com/apache/echarts/pull/20184

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   ## Brief Information
   
   This pull request is in the type of:
   
   - [x] bug fixing
   - [ ] new feature
   - [ ] others
   
   
   
   ### What does this PR do?
   
   <!-- USE ONE SENTENCE TO DESCRIBE WHAT THIS PR DOES. -->
   
   When angleAxis in the polar system has `boundaryGap: false`, the extent is 
adjusted since [this 
commit](https://github.com/apache/echarts/commit/2fcdde6ea773514ff34e2eceece1c97bfe2ebb47#diff-43424e7431043adf45e3aba374fe74528fe1475b0e098246b6e4454578fc1aa5R127-R130)
 so that polar bars don't overlap each other. The main idea is to make extra 
space according to data count. But it may overkill in some situations.
   
   ### Fixed issues
   
   NA.
   
   This PR is not a fix to #20172 , which is not a bug.
   
   ## Details
   
   ### Before: What was the problem?
   
   Consider the case when `startAngle: 90, endAngle: -90`, before this PR, it 
has the result of:
   
   <img width="468" alt="image" 
src="https://github.com/user-attachments/assets/114eb20d-d205-47f6-9923-ce8d34c19516";>
   
   This is not as expected because a developer set `startAngle: 90, endAngle: 
-90` would expect the range to be half a circle.
   
   ### After: How does it behave after the fixing?
   
   The extent of angleAxis with `boundaryGap: false` should only be adjusted if 
it has the potential to overlap, that is to say, `startAngle: 90, endAngle: 
-90` should still get half a circle:
   
   <img width="502" alt="image" 
src="https://github.com/user-attachments/assets/208e9194-7c2a-4c4c-8df7-bd54a05a67bf";>
   
   while `startAngle: 90, endAngle: -270` should get 3/4 of a circle:
   
   <img width="561" alt="image" 
src="https://github.com/user-attachments/assets/afd918b4-da27-464c-9682-5467302a2ba4";>
   
   Please also not that if the range of startAngle and endAngle itself is over 
360 degrees, it won't adjust to be smaller than a circle because it is not 
expected to.
   
   <img width="691" alt="image" 
src="https://github.com/user-attachments/assets/b960c4b0-0e30-48bd-a65f-6092839a1713";>
   
   
   ## Document Info
   
   One of the following should be checked.
   
   - [x] This PR doesn't relate to document changes
   - [ ] The document should be updated later
   - [ ] The document changes have been made in apache/echarts-doc#xxx
   
   
   
   ## Misc
   
   ### ZRender Changes
   
   - [ ] This PR depends on ZRender changes (ecomfe/zrender#xxx).
   
   ### Related test cases or examples to use the new APIs
   
   N.A.
   
   
   
   ## Others
   
   ### Merging options
   
   - [ ] Please squash the commits into a single one when merging.
   
   ### Other information
   


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