[GitHub] [incubator-echarts] plainheart commented on issue #12649: how to solve this !!

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

plainheart commented on issue #12649:
URL: https://github.com/apache/incubator-echarts/issues/12649#issuecomment-629994924


   @Rranjansolenoid Hi, I'm not sure whether this issue is related to `echarts` or not and it was closed for not using [issue template](https://ecomfe.github.io/echarts-issue-helper/).
   It seems to be a mathematical problem. There are some example codes for you.
   ```js
   // circumference of the circle
   let c = 8 * 12; // feet to inch
   
   // the radius of circle
   let r = c / (2 * Math.PI);
   
   // target arc length we want to get
   let targetArcLength = 0.01;
   
   // the arc length of circle
   let arcLength = c;
   
   // fold count
   let foldCount = 0;
   
   // the center angle of circle
   let circleCenterAngle = 360;
   
   // loop until the arc length is less than 0.01
   while(arcLength >= 0.01) {
   	// calculate the center angle of circle by foldCount
   	circleCenterAngle = 360 * Math.pow(2, -foldCount);
   	// calculate the arc length(arcLength = nπr / 180)
   	arcLength = circleCenterAngle * Math.PI * r / 180.0;
   	// increases the foldCount
   	++foldCount;
   }
   
   console.log('foldCount', foldCount)
   ```
   Run it and then we can get the result `foldCount 15`. Is it expected?


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