creadone opened a new issue #10987: Correct way to straighten smoothed lines for ThemeRiver chart (question) URL: https://github.com/apache/incubator-echarts/issues/10987 ### Description Echarts has great chart type ThemeRiver (also known as streamgraph) but this type has no options `smooth` or `smoothMonotone` like in other chart types. It does not allow to straighten the lines. I found (probably) [place in code](https://github.com/apache/incubator-echarts/blob/master/src/chart/themeRiver/ThemeRiverView.js#L98-L107) where this options inlined but it cannot be changed from official API. Rewrite this code directly will cause a problem with the future updates. ### What problem does this feature solve? Smooth lines in charts need for best looking but when you need greater accuracy the only way — to straighten the lines. ### What does the proposed API look like? The best option to do [as in other types](https://echarts.apache.org/en/option.html#series-line.smooth) of diagrams:  ### Workaround Is there possible to overload the [`process`](https://github.com/apache/incubator-echarts/blob/master/src/chart/themeRiver/ThemeRiverView.js#L68) function without changes source code? Something like the plugin or extension API. <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE --> <!-- This issue is in English. DO NOT REMOVE -->
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