buhichan commented on issue #9284:
URL: https://github.com/apache/echarts/issues/9284#issuecomment-817476744


   currently visualMap over Y-axis seems buggy to me, see 
https://codesandbox.io/s/dreamy-neumann-b8iz9?file=/src/App.js
   
   1. if use the pieces around lines#47, it throws error, I have to  hack it 
around by add lower bound and upper bound stops.
   2. Threshold value between stops have to depend on canvas size and line 
width, or else you will get a buggy "double color line". Try adjust the 
threshold range input in the example.
   
   I wish there exists a lower level API to draw different line segment based 
on individual data item, instead of the current linear gradient solution.


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