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Posted to commits@echarts.apache.org by GitBox <gi...@apache.org> on 2021/10/22 10:46:43 UTC

[GitHub] [echarts] KrzysztofMadejski opened a new issue #15926: VisualMap: compute colors depending on values

KrzysztofMadejski opened a new issue #15926:
URL: https://github.com/apache/echarts/issues/15926

### What problem does this feature solve?
Sometimes I do not know all the values that will come from the backend. Still, I'd like specific values/categories to have stable colors no matter how many or in which order will be retrieved.

Currently I do have defined colors for a few values and for the rest I'm hashing the values and generating unique color codes, but I have to do it by generating `chart/series.color` property based on the data. I'd prefer to have a native way of doing it in ECharts.

### What does the proposed API look like?
Introduce third way of mapping next to 'Linear Mapping' and 'Table Mapping'. It could be called 'Functional Mapping'.

Each of the visual channels (color, symbol, etc.) could take a function apart from an array or a map. Implementation would be very similar to Table Mapping, but instead of:
```javascript
channel[value]
```
would do
```javascript
channel(value)
```

Seems like a relatively easy change.

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[GitHub] [echarts] pissang commented on issue #15926: VisualMap: compute colors depending on values

Posted by GitBox <gi...@apache.org>.

pissang commented on issue #15926:
URL: https://github.com/apache/echarts/issues/15926#issuecomment-951503781


   It's a useful proposal that we have been considering for a while. Currently `itemStyle.color` can be a callback function to have similar effect.


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[GitHub] [echarts] echarts-bot[bot] commented on issue #15926: VisualMap: compute colors depending on values

Posted by GitBox <gi...@apache.org>.

echarts-bot[bot] commented on issue #15926:
URL: https://github.com/apache/echarts/issues/15926#issuecomment-949507657

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