[GitHub] [incubator-superset] junlincc commented on issue #11088: Wrong scale in dual axis line chart?

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

junlincc commented on issue #11088:
URL: https://github.com/apache/incubator-superset/issues/11088#issuecomment-717666688


   @lke27 if you take a closer look at your first graph where both lines perfectly aligned, there are actually two sets of gridlines. 
   
   <img width="824" alt="Screen Shot 2020-10-27 at 7 55 23 PM" src="https://user-images.githubusercontent.com/67837651/97385190-6db60480-188e-11eb-96d5-c811ea84a9f3.png">
   
   @betodealmeida had a PR couple years ago to align gridlines in multi-lines chart to create better visual. in order to do so, y axis got stretched or compressed. in your second graph, y(price) is higher the y(index) on the left side of the graph, they overlap in the middle, and y(index) is higher than y(price) on the right side. 
   <img width="768" alt="Screen Shot 2020-10-27 at 7 59 15 PM" src="https://user-images.githubusercontent.com/67837651/97385455-ef0d9700-188e-11eb-8b5f-daf672e40e22.png">
   
   in theory, a rebased number y2 axis should overlap with y1 axis, but that will compromise either the perfectly aligned grid, or a set of nice/rounded index number. See below. 
   
   <img width="513" alt="Screen Shot 2020-10-27 at 7 45 55 PM" src="https://user-images.githubusercontent.com/67837651/97385657-59bed280-188f-11eb-9b6a-54f99c0c9977.png">
   
   We certainly can provide a solution to give user the option to create the first chart in above screen shot where two lines are overlap with messy index, if that's helpful. 
   
   
   @mistercrunch 


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