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Posted to commits@echarts.apache.org by "jimmykane (via GitHub)" <gi...@apache.org> on 2026/05/28 11:48:54 UTC
[I] [Bug] ECharts 6.1.0 canvas dirty-rect repaint corrupts dense line series on tooltip axis-pointer hover [echarts]
jimmykane opened a new issue, #21634:
URL: https://github.com/apache/echarts/issues/21634
### Version
6.1.0
### Link to Minimal Reproduction
https://codesandbox.io/p/sandbox/tender-merkle-ymcjr9?file=%2Fsrc%2Findex.js%3A4%2C51
### Steps to Reproduce
Steps to Reproduce
Open the ECharts examples editor: https://echarts.apache.org/examples/en/editor.html
Paste the minimal reproduction snippet.
Ensure the page is running ECharts 6.1.0.
Keep useDirtyRect: true.
Hover/move the mouse across the chart so the tooltip axis pointer updates.
### Current Behavior
When hovering the chart, parts of the dense line series visually disappear or render as broken/dashed segments. The underlying data is still present, and the tooltip continues to resolve values, but the canvas repaint appears corrupted around axis-pointer updates.
The issue disappears when either:
useDirtyRect is set to false
the tooltip axis pointer is disabled
### Expected Behavior
Hovering should only update the tooltip and axis pointer. The line series should remain visually continuous and unchanged while the pointer moves.
### Environment
```markdown
- OS: OSX
- Browser: ALL
- Framework: ANgular
```
### Any additional comments?
This appears to be a regression in ECharts 6.1.0. The same chart behavior worked with ECharts 6.0.0.
The affected setup uses:
canvas renderer
useDirtyRect: true
dense line series
showSymbol: false
progressive rendering
visualMap piecewise coloring
tooltip with trigger: 'axis'
tooltip axisPointer.type: 'line'
For our app, disabling dirty rect hurts performance, and disabling the axis pointer removes useful chart feedback, so neither is a good long-term workaround.
<img width="387" height="258" alt="Image" src="https://github.com/user-attachments/assets/ccfe1252-11a5-4947-8241-829a435e1f67" />
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Re: [I] [Bug] ECharts 6.1.0 canvas dirty-rect repaint corrupts dense line series on tooltip axis-pointer hover [echarts]
Posted by "ffzhai (via GitHub)" <gi...@apache.org>.
ffzhai commented on issue #21634:
URL: https://github.com/apache/echarts/issues/21634#issuecomment-4861899455
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ehcarts 6.1.0
useDirtyRect: true
VisualMap may also experience visual loss when hovering on a chart with dirty rectangles enabled
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