Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fixes the issue where changing labelLine.smooth from true to false does not take effect in pie charts.

Fixed issues

• [Bug] Changing the smooth attribute from true to false in the pie chart labelLine configuration item does not take effect #21418: pie chart labelLine smooth configuration change from true to false not working

Details

Before: What was the problem?

There was an issue with the labelLine.smooth configuration in pie charts (Issue #21418). When smooth was initially set to true and then changed to false dynamically (through setOption or in initial configuration), the label lines remained as smooth curves instead of reverting to straight lines. This prevented users from properly controlling the visual style of label lines.

Reproduction steps:

1. Set labelLine.smooth: true in pie chart configuration
2. Update configuration with labelLine.smooth: false
3. Observe that label lines still appear as smooth curves

After: How does it behave after the fixing?

After the fix, the labelLine.smooth configuration now correctly responds to changes. When smooth is changed from true to false, the label lines immediately update to straight lines as expected. This ensures proper dynamic control over label line styling.

Verification:

• Setting labelLine.smooth: false now correctly renders straight label lines
• Dynamic updates between true and false values work correctly
• Backward compatibility is maintained for existing configurations

Document Info

One of the following should be checked.

• 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

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Merging options

• Please squash the commits into a single one when merging.

Other information