plotting mathematical funtions

[thatsmeta]

• [x] I am using English in this issue. 在这个 Issue 中我使用了英文（强烈建议）。

General Questions

• [x] Required: I have read the document and examples and tried to solve it by myself. （必填）我读过了文档和教程，并且曾试图自己解决问题。
• [x] Required: I have searched for similar issues and that didn't help. （必填）我搜索过 issue 但是没有帮助。
• [x] Required: I have tried with the latest version of ECharts and still have this problem. （必填）我试过最新版本的 ECharts，还是存在这个问题。

In this issue, I have provided information with: 在这个 issue 中我提供了以下信息：

• [x] Required: issue type；（必填）issue 类型
• [x] Required: one sentence description in issue details；（必填）一句话的问题描述
• [x] Required: demo；（必填）能反映问题的例子（如果你想提问或报 bug）
• [x] Required: ECharts version；ECharts 版本

Issue Type

• [ ] I have a question to ask about how to use ECharts to ...；我想提问如何使用 ECharts 实现某功能
• [ ] I have a bug to report；我想要报 bug
• [x] I have a feature to request, e.g.: I'd like a new feature that ...；我需要一个新功能
• [ ] I have a feature to enhance, e.g.: The current feature should be improved in the way that ...；我希望改进某个功能
• [ ] There's something wrong with the documents；文档有些问题
• [ ] Others, or I'm not sure which issue types to choose here；其他，或我不知道应该选什么类型

Issue Details

It should be possible to plot mathematical funtions in 2D charts.

Expected Behavior

For 3D charts, it is already possible to have mathematical functions in the chart options which will then be plotted. I think it would be nice to have that possibility for 2D charts as well. For example, I might have the formula for a polynomial regression over a timeseries and would like to plot it. At the moment, I would have to generate an array of points for that regression and create a new series from that array. It would be helpful to have a callback instead, which calculates the value from a given timestamp.

If this is already possible, please tell me how to do it.

Current Behavior

Online Example

dygraphs can do it, see here: http://dygraphs.com/gallery/#g/plotter

Topics

• [ ] Legend
• [ ] Tooltip
• [ ] Event
• [ ] Performance
• [ ] SVG
• [ ] Map
• [ ] ECharts GL
• [ ] Third-party libraries, e.g.: Vue.js, React

Anything Else We Need to Know

Environment

• ECharts version；ECharts 版本: {DESCRIBE_HERE}

• [ ] It happens only on certain browsers or operating systems. 对于特定浏览器或操作系统才会出现的问题，请提供相应环境信息：{BROWSER_VERSION_OR_OS_INFORMATION_HERE}

[deqingli]

Currently, we don't have this feature yet, we can consider supporting this feature in the form of a callback in the future.

[github-actions[bot]]

This issue has been automatically marked as stale because it did not have recent activity. It will be closed in 7 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this issue.

[github-actions[bot]]

This issue has been automatically closed because it did not have recent activity. If this remains to be a problem with the latest version of Apache ECharts, please open a new issue and link this to it. Thanks!