[GitHub] [echarts] hughess commented on issue #15102: Bar stacking doesn't work if the x-axis is value type instead of category type

[GitBox <gi...@apache.org>]

hughess commented on issue #15102:
URL: https://github.com/apache/echarts/issues/15102#issuecomment-957677200


   +1 for needing stacking on a value axis. 
   
   Biggest problem for me with this is missing values - there may be parts of your x-axis where none of your series have any observations. It's a pain to have to iterate through the dataset and prepare it so that it shows missing data.
   
   For example:
   ```javascript
   series1 = [
      [3, 10],
      [4, 13],
      [5, 16],
      [8, 21]
   ]
   
   series2 = [
      [3, 15],
      [4, 17],
      [5, 21],
      [8, 23]
   ]
   ```
   
   Using a `category` axis with this data won't show 6 or 7 on the axis. Using `value` would work if stacking was possible.
   
   The current workaround for this would be to iterate through each of these series, see which x values are missing, and recreate the data so that 6 and 7 are included as rows in each dataset. 
   
   One approach that might work is to treat this situation in the same way as a histogram:
   - Assume a default interval based on the data provided to the chart (e.g., if it's years or integers, interval = 1. If it's a continuous variable, have some default logic to assume an interval)
   - Bin the data using the interval
   - Plot the data, effectively treating the x-axis as a category axis
   - You could probably even explicitly treat the axis as category - at least for me, I don't care if the axis is value or category. I would just prefer not to have to write the code to check/fill values for each chart I build


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