olivia-ymy opened a new issue #10030: 希望主题河流图的tooltip改进 URL: https://github.com/apache/incubator-echarts/issues/10030 ### What problem does this feature solve? 目前主题河流图只能支持tooltip的trigger为axis的情况，当改trigger为item时就无法显示tooltip。即目前是每一列（同一时间点）共用一个tooltip，能否支持每个一条河流共用一个tooltip或者每一个点有对应的tooltip。（因为当河流较多时，放到一点上出来一列后，还是难以找到这一点的具体相关信息） ### What does the proposed API look like? tooltip:{ trigger:'item', formatter:{ ... } } <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
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