[GitHub] [echarts] plainheart edited a comment on issue #14695: Connected tooltip lags and glitches on paired chart

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

plainheart edited a comment on issue #14695:
URL: https://github.com/apache/echarts/issues/14695#issuecomment-826274009


   @pissang To find out why the tooltip is lagged and shakes from side to side, especially in the connected charts, I dug slightly into the related source code. Currently, I'm thinking it may be for the method `TooltipView#_updatePosition` will be very frequently called when `mousemove`. Only in `4ms`, it seems to be called many times. The normal chart can work smoothly, but in the connected chart, it will become worse. So far, I tried to throttle the `_updatePosition` function in `50ms`(the tested result may need to validate), it's working better in both Chrome(with the devtools open) and Firefox even if we use the previous way `left/top`.
   
   Here is the demo using the ECharts lib based on this temporary solution, it seems to be working well in Firefox and Chrome with the devtools open. https://codepen.io/plainheart/pen/KKarOZb
   
   The branch for this change is https://github.com/apache/echarts/tree/fix-tooltip. The related test case is `tooltip-lag-glitch.html`.
   
   


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