pissang commented on pull request #13314:
URL: 
https://github.com/apache/incubator-echarts/pull/13314#issuecomment-695879944


   https://echarts-bench-from-uplot.glitch.me/uplot-smoothing.html
   
   I tried it and it looks similar to our original bezier curve implementation 
without limiting min, max value. The problem is the curve will exceed the 
extremas. For example under the 0 baseline or exceed the max value(if the max 
value has some meaning like 100 percent.
   
   
![image](https://user-images.githubusercontent.com/841551/93729676-1cb05200-fbf8-11ea-869b-f46e90dda42a.png)
   
   If we limiting the curve between global min, max extremas.
   
https://echarts-bench-from-uplot.glitch.me/uplot-smoothing-limit-extrema.html  
   
   It's almost like the result in this PR before optimization.
   
   
![image](https://user-images.githubusercontent.com/841551/93729893-e9ba8e00-fbf8-11ea-8723-4e41fd0dab09.png)
   
   


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