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feat(graph): new thumbnail component #17471
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Document changes are required in this PR. Please also make a PR to apache/echarts-doc for document changes and update the issue id in the PR description. When the doc PR is merged, the maintainers will remove the |
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Brief Information
This pull request is in the type of:
What does this PR do?
add thumbnail component, it looks like

Fixed issues
#7521& #11352
Details
we could provide a thumbnail, we can give users the intuitive about the overall shapes of the whole series and the current visible area.


Before: What was the problem?
For series like maps, graphs, trees, sankeys, data shapes sometimes may be too large to displayed without overlap in a chart. Some charts supports roam (not sankey) but the user may not have an idea about the relationship between the current visible data and the overall data
Document Info
One of the following should be checked.
Misc
ZRender Changes
Related test cases or examples to use the new APIs
N.A.
Others
Merging options
Other information