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I'm working with ECharts (http://echarts.baidu.com/index.html) for a few weeks, and I find this library very powerful.

However, it would be great if I could create custom chart types, e.g. a word cloud such as http://www.wordle.net/ (I've found a "character cloud" with echarts 2, but I'm not happy with it).

Is there an "easy" way to declare such a new chart type ? (otherwise I'll dig in the source files on GitHub).

Idealy, I would like to use the Echarts "engine" to provide nice features like export or data view, and implement only the "custom" parts (such as series declaration and rendering).

Thanks a lot, and best regards!

Romain André-Lovichi
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This is called extension in ECharts. We are working on the documentation and demo to make extensions. Currently, you may refer to the example of ECharts extension with Baidu Map.

Ovilia
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    Any news regarding the documentation and demo to make extensions? I've found a few example on GitHub (https://github.com/ecomfe/echarts/tree/master/extension/bmap, https://github.com/ecomfe/echarts-graph-modularity, https://github.com/ecomfe/echarts-wordcloud), but I'm a bit lost. – Romain André-Lovichi Mar 20 '18 at 11:11
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    @Ovilia year 2019. Any news on documentation? @Romain, have you managed to do something with a custom type of graph? The best I could find is to find a reference about type called `custom`, where you could implement a custom method of `renderItem` . The functionality is quite limited and is not the same as creating an extension of a new type. – Alex Apr 17 '19 at 09:27
  • @Ovilia please don't take my comment as an offense. Even with all this poor documentation and limitations - echarts is still my favorite library. It outperforms some other libraries such as Plotly.js as well as WinForms solutions, in my scenarios. I am grateful for the that work you do, but wish that you had explained better how the library could be extended. My need: https://stackoverflow.com/questions/55694093/baidus-echarts-filling-up-space-between-2-lines – Alex Apr 17 '19 at 10:08