[GitHub] fxxjdedd opened a new pull request #9531: fix(sankey): modify the calculation of node value

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

fxxjdedd opened a new pull request #9531: fix(sankey): modify the calculation of node value
URL: https://github.com/apache/incubator-echarts/pull/9531
 
 
   使用桑吉图的时候遇到一个问题:
   我的数据中，从某个node流出的数据可能会有流失，也就是说，这些node的outLinks的所有值的和，可能会小于node的值，所以就出问题了。
   ![image](https://user-images.githubusercontent.com/13739947/49501208-4bd3c300-f8ad-11e8-9071-bf31da00b7b5.png)
   
   出问题的原因，看了下源码，发现node的dy的计算方式为:
   ![image](https://user-images.githubusercontent.com/13739947/49501318-876e8d00-f8ad-11e8-9a50-e3539deb6f8f.png)
   是根据max(inLinks总值, outLinks总值)得出的，而links总值可能会<=node的总值，所以导致node的dy的计算出问题。
   所以做了如下改动:
   ![image](https://user-images.githubusercontent.com/13739947/49501438-cd2b5580-f8ad-11e8-949e-63a8c46dd3ec.png)
   我觉得这样做，不仅不影响sankey原来的效果，还能适应我说的这种流失情况。
   

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