Hi, In this PR ( https://github.com/apache/incubator-echarts/pull/12775#issuecomment-646962464 ), I have proposed a "during API" in custom series.
But we still need to think of that: Is it appropriate to implement those features via exposing a "during callback" to users? Is it appropriate to implement "read & write" in the way of the DuringAPI above? Is there any potential flaw I missed or any other better solution? (The detailed info and considerations are listed in the comment of that PR). Thanks a lot, ------------------------------ Su Shuang (100pah) ------------------------------
