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Posted to commits@echarts.apache.org by "zkycaesar (via GitHub)" <gi...@apache.org> on 2024/07/16 05:22:00 UTC
[I] [Feature] lttb采样可以添加点数参数吗 [echarts]
zkycaesar opened a new issue, #20165:
URL: https://github.com/apache/echarts/issues/20165
### What problem does this feature solve?
目前lttb采样好像没有可以配置参数的地方，如果我的点数很多，比如上亿，那就算是开了lttb，渲染也十分慢。所以是不是可以把参数开放出来，让用户可以调节采样的力度。
### What does the proposed API look like?
比如像这几个库这样，开放lttb参数：
[simplify-js](https://github.com/mourner/simplify-js)
[downsample-lttb](https://github.com/pingec/downsample-lttb)
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Re: [I] [Feature] lttb采样可以添加点数参数吗 [echarts]
Posted by "zkycaesar (via GitHub)" <gi...@apache.org>.
zkycaesar commented on issue #20165:
URL: https://github.com/apache/echarts/issues/20165#issuecomment-2230127182
对了，另外还有几个点看是不是有优化空间：
- 折线图好像是必须要传x坐标数组？但其实很多简单情况下，x就是递增下标。如果能只传y数组就更好了。
- y坐标现在好像是用Float64Array？但我们经常是用Float32，甚至Float16也能忍受。
这几个点可以让我们的应用优化更多的内存占用。
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Re: [I] [Feature] lttb采样可以添加点数参数吗 [echarts]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed issue #20165: [Feature] lttb采样可以添加点数参数吗
URL: https://github.com/apache/echarts/issues/20165
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Re: [I] [Feature] lttb采样可以添加点数参数吗 [echarts]
Posted by "Ovilia (via GitHub)" <gi...@apache.org>.
Ovilia commented on issue #20165:
URL: https://github.com/apache/echarts/issues/20165#issuecomment-2242268859
最佳的解决方案是从产品设计的角度思考：
1. 是否有必要展现上亿数据，和使用后端采样后的数据相比，是否提供了足够大的价值来支撑这一代价
2. 是否存在其他交互方式的可能性，或者拆分多个图表等方案，从产品设计角度思考其他可能性，比较各自的优劣
仅从纯技术角度优化的话：ECharts 官方对散点图的大数据支持量级是千万级别的，参见 https://echarts.apache.org/examples/en/editor.html?c=lines-ny 以及 https://github.com/apache/echarts/blob/master/test/linesGL-ny-appendData.html 。使用 `progressive` 渐进式渲染，后者使用二进制文件，体积更小，使用 WebGL 加速渲染。
> 折线图好像是必须要传x坐标数组？但其实很多简单情况下，x就是递增下标。如果能只传y数组就更好了。
>
> y坐标现在好像是用Float64Array？但我们经常是用Float32，甚至Float16也能忍受。
ECharts 为了针对各种场景都表现良好，必须保证足够的通用性设计。如果你觉得这样的优化可以帮助你们在特定场景下提高性能，可以尝试 fork 出来修改源码，看看是不是能起到优化的效果。
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Re: [I] [Feature] lttb采样可以添加点数参数吗 [echarts]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #20165:
URL: https://github.com/apache/echarts/issues/20165#issuecomment-5136437225
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!
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Re: [I] [Feature] lttb采样可以添加点数参数吗 [echarts]
Posted by "zkycaesar (via GitHub)" <gi...@apache.org>.
zkycaesar commented on issue #20165:
URL: https://github.com/apache/echarts/issues/20165#issuecomment-2230111841
> 如果是上亿数据，应该考虑在服务端做采用处理，不要返回这么多的数据
确实应该后端采样。只是我们现在的应用还需要dataZoom，如果是后端采样的话，一个是前后端就需要频繁地交换数据，另一个是好像就没法利用现成的这个dataZoom组件了。
针对这个场景，您有什么建议吗？还是说我们只能自己来实现dataZoom了？
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Re: [I] [Feature] lttb采样可以添加点数参数吗 [echarts]
Posted by "Ovilia (via GitHub)" <gi...@apache.org>.
Ovilia commented on issue #20165:
URL: https://github.com/apache/echarts/issues/20165#issuecomment-2230088081
如果是上亿数据，应该考虑在服务端做采用处理，不要返回这么多的数据
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Re: [I] [Feature] lttb采样可以添加点数参数吗 [echarts]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on issue #20165:
URL: https://github.com/apache/echarts/issues/20165#issuecomment-5051754946
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.
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