creadone commented on issue #10987: Correct way to straighten smoothed lines 
for ThemeRiver chart (question)
URL: 
https://github.com/apache/incubator-echarts/issues/10987#issuecomment-535030277
 
 
   @deqingli, can i ask another question?
   
   With the ThemeRiver i can't get the legend colors for draw custom legend in 
HTML. I found a tricky way:
   
   ```javascript
   drawLegend = function(instance, legend_name){
     let palette = instance.getModel().getShallow('color');
     let nameMap = 
instance.getModel()._componentsMap.data.series[0].nameMap['data'];
     return palette[nameMap[legend_name] - 1]; // Name index in group starts 
with one.
   }
   ```
   Could there be a more correct and safer way for color extraction?
   
   
![themeRiver-min](https://user-images.githubusercontent.com/990803/65605234-69dff080-dfb1-11e9-8a24-35b851080504.gif)
   
   

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