[GitHub] [echarts] pissang commented on issue #15437: Setting sampling (downsampling) threshold value

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

pissang commented on issue #15437:
URL: https://github.com/apache/echarts/issues/15437#issuecomment-919666036


   > Unfortunately I can't hover over the point to see the tooltip if I do that. I can't use axis tooltip mode because it shows every single point, and there are too many measurements to fit on the screen. I want to be able to hover over a point and see the label and value for that one point. Do you know of a way I can use tooltip trigger "item" along with symbol "none"? If there is not, then I would like to go the route of reducing the number of samples on screen at a time if possible. I feel like there could be many other applications where you would want to simplify a graph by changing the downsampling threshold from the default.
   
   We are planning to enhance line tooltip in this case. 
   
   > If this isn't an option, is there a way to accelerate the chart loading using WebGL? I know that echarts uses webgl to implement several 3d charts. Is is possible to use webgl to draw this 2d line chart?
   
   In this case, I think WebGL can't accelerate. Especially there is a limitation of WebGL context number in one page. 50 chart instances may cause most of them failing to render.


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