[GitHub] palmiche opened a new issue #8091: [FR] Allow valueFactor for axis rendering

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

palmiche opened a new issue #8091: [FR] Allow valueFactor for axis rendering
URL: https://github.com/apache/incubator-echarts/issues/8091
 
 
   ### One-line summary [问题简述]
   
   Feature Request: Allow specifing a value scale factor for axis of type 'value' so all values displayed will be multiplied by said factor.
   
   ### Version & Environment [版本及环境]
   + ECharts version [ECharts 版本]: 4.0.4
   + Browser version [浏览器类型和版本]: Any
   + OS Version [操作系统类型和版本]: Any
   
   ### Expected behaviour [期望结果]
   Displayed values multiplied by valueFactor.
   
   ### ECharts option [ECharts配置项]
   Before:
   ```javascript
   option = {
       ...
       yAxis: [ 
           {name: "Ventas"},
           {name: "Monto" }
        ]
       ...
   }
   ```
   After:
   ```javascript
   option = {
       ...
       yAxis: [ 
           {name: "Ventas"},
           {name: "Monto (Millones)", valueFactor: 1e-6 }
        ]
       ...
   }
   ```
   
   ### Other comments [其他信息]
   Here *Monto* has too many zeroes: 
   ![resumenpipeline_1meses_abril2018_act_2018-04-03_1445](https://user-images.githubusercontent.com/12277525/38266838-16af4e52-3750-11e8-8a8b-6fffb0676938.png)
   
   This is a better way to display the same information:
   ![resumenpipeline_1meses_abril2018_act_2018-04-03_1446](https://user-images.githubusercontent.com/12277525/38266840-16ce9a78-3750-11e8-8994-4b5760db8835.png)
   
   Currently there are two main ways to achieve that:
   1. Multiplying the values before feeding the to the chart. The drawback is that the tooltip and the axis pointer will display the new value instead of the original, ie. *3* instead of *3,456,789*.
   2. Using custorm formatters. This means more coding and the posibility of breaking i18n for the chart.
   
   What I'm proposing is option number 3: specifying a value that will get the expected result without changing the underlying data o extra coding. That leaves whether to apply the factor to *min* and *max* but that is a different issue.
   
   
   
   
   
   
   
   

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