gooroodev commented on PR #19602:
URL: https://github.com/apache/echarts/pull/19602#issuecomment-2131318923

   ### 1. Summary of Changes
   The pull request addresses an issue where stacked areas overflow on null 
values when the `connectNulls` option is set to true. The changes involve 
updating the `getStackedOnPoint` function in `src/chart/line/helper.ts` to 
handle null values more gracefully by:
   - Separating the retrieval of `stackedOverValue` and `stackResultValue`.
   - Adding a condition to check for `stackedOverValue` and `stackResultValue` 
to determine if `stackedOverValue` should be set to `dataCoordInfo.valueStart`.
   
   ### 2. Issues, Bugs, or Typos
   
   #### Issue 1: Unnecessary Check on `dataCoordInfo.stacked`
   The condition `dataCoordInfo.stacked && isNaN(stackResultValue)` is 
redundant since `dataCoordInfo.stacked` is already checked before retrieving 
`stackResultValue`.
   
   **Proposed Improvement:**
   Remove the redundant `dataCoordInfo.stacked` check in the condition.
   
   ```diff
   -    if (isNaN(stackedOverValue) && !(dataCoordInfo.stacked && 
isNaN(stackResultValue))) {
   +    if (isNaN(stackedOverValue) && !isNaN(stackResultValue)) {
   ```
   
   ### 3. General Review of Code Quality and Style
   
   #### Positive Aspects:
   - The code changes are clear and well-targeted at solving the specific issue.
   - Variable names are meaningful and improve readability.
   
   #### Suggestions for Improvement:
   - Consistency in formatting: Ensure consistent use of indentation and 
spacing.
   - Comments: Adding comments to explain the logic, especially the condition 
handling, would improve maintainability.
   
   **Example of Improved Code with Comments:**
   ```typescript
   export function getStackedOnPoint(
       dataCoordInfo: DataCoordInfo,
       coordSys: CoordinateSystem,
       data: SeriesData,
       idx: number
   ) {
       let stackedOverValue = NaN;
       let stackResultValue = NaN;
   
       // Retrieve stacked values if stacking is enabled
       if (dataCoordInfo.stacked) {
           stackedOverValue = data.get(
               data.getCalculationInfo('stackedOverDimension'),
               idx
           ) as number;
           stackResultValue = data.get(
               data.getCalculationInfo('stackResultDimension'),
               idx
           ) as number;
       }
   
       // If stackedOverValue is NaN but stackResultValue is valid, use 
valueStart
       if (isNaN(stackedOverValue) && !isNaN(stackResultValue)) {
           stackedOverValue = dataCoordInfo.valueStart;
       }
   
       const baseDataOffset = dataCoordInfo.baseDataOffset;
       const stackedData = [];
       stackedData[baseDataOffset] = data.get(dataCoordInfo.baseDim, idx);
       stackedData[1 - baseDataOffset] = stackedOverValue;
   
       return coordSys.dataToPoint(stackedData);
   }
   ```
   
   Overall, the pull request effectively addresses the issue, but minor 
improvements in condition handling and code comments would enhance its quality.
   
   Yours, [Gooroo.dev](https://gooroo.dev). To receive reviews automatically, 
[install Github App](https://github.com/apps/gooroo-dev)
   
   


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