[GitHub] [incubator-echarts] CarterLi edited a comment on issue #9232: Use OffScreenCanvas API for big data live charts

[GitBox <gi...@apache.org>]

CarterLi edited a comment on issue #9232: Use OffScreenCanvas API for big data live charts
URL: https://github.com/apache/incubator-echarts/issues/9232#issuecomment-473817179
 
 
   Got some progress.
   
   Like what @skortchmark9 said, Echarts itself has very good worker-env support, but no interaction.
   
   Three major problems:
   
   1. Echarts [won't bind any mouse events in worker-env](https://github.com/ecomfe/zrender/blob/ba969fd4100ae0b667ee3d5b7a2d4c1217a52ce1/src/zrender.js#L133). I didn't find any solution other then modifying the source code.
   
   2. Echarts [incorrectly doesn't think the browser support DomLevel2 in worker-env](https://github.com/ecomfe/zrender/blob/ba969fd4100ae0b667ee3d5b7a2d4c1217a52ce1/src/core/event.js#L10), result in using attachEvent. We can work around this by setting `window` and addEventListener property on global this of worker.
   
   3. Of course browser won't trigger any mouse events in worker-env. We have to dispatch those events from UI thread.
   
   Working example: https://github.com/CarterLi/echarts-with-offscreencanvas

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