AAravind27 commented on issue #19885:
URL: https://github.com/apache/echarts/issues/19885#issuecomment-2089905843

   Use case: When there are a lot of values, say >20, in legend and user wants 
a subset of them, then instead of toggling the items in legend, user can make a 
rectangular selection of desired values, which will also update the visibility 
of items in the legend.
   
   > Typically _brush_ is not used on these types of charts.
   
   @helgasoft , Please elaborate. Are you saying this regarding echarts? what 
do you mean by these "types of charts". Please include references, if any.
   
   > 
[Demo](https://echarts.apache.org/examples/en/editor.html?c=funnel&code=PYBwLglsB2AEC8sDeAoWtJgDYFMBcya6GOAHmAQOQBiArtNDlpUQL4A0RYwwWkIBVMQwAnCAHNxOEVQhgcAW0qdhAM2AiFAQzDyZsSki2tYAHgBGIgPQA-JOZOCAxqwCkLdByK4p0ACaCXugAztIQOMEEANpE6ELCsNBaCvgGdAxMyrHEYACeIKmUqvSMzCoJuKoUBgCMAAzu5cLcArAAbHVNxObAusAKBB1d6ADuEH5gABZUABwNWQmwChDQBJ3Z6NqkBPXri8vQAMoQAF6F88NLWqTHZ1S7jRuwwRrVlH4RTjj-K-ILCeItK0AEyXLBacxMQRPEKTYAjAhgES0HCXdAgYDBORQVYGFZYj4eBJBBKhXBOeR-ACywA-VAUtD4EBAuH-wnBkKwABkVql4otcNBxFMdntFrAsLzDnlcNDxcQxhNprAamicvlCi9JX4iYtWE8ScI5IppblZYR5T0RB8RABhXgaKgAYlUrrZCStNoA6uMRSqDZdFCBJlosZELeKOVCI_L1NAwLdUsC6jDYPq9Zc_DotNFU0hYAA3LRYFGDTqJZKFABqECxYEoabV-aLJdSABZy0kUlQAJLQACOtAgIlyDcNCWbxdLsGT7Ar3YMAHlrdIx03C1PUnM513CrbJU4ANZrvMb1uizuVqiHOEjMdPAC62XTsCfrAA3CgyX4ELAog_PwUXJbRDEQwAAOhgAAKSgyRwCknBDIUcB1OdKG4SRcEOJh4PrOdimgCkcVgKCQBAABKCMRC0EY-z8CAvmCX8yPAuCKRQ8DBWFSYbDqWAAH5YBYtjKSiOoH3ArMwC0OiyFgKhKE_TZgNAiDQjARdwBxKD-QwORzV09BzC0I9xBEYB6D8e0sEdAwnQAZkc910HkchrwAUS5dzbQAFXcgARAgAB1oAbABqWBqNon
 5GMuHo-gGWAxWEMRxEmN56keRZFT9XZLlchMZT5WA4wTU5UhqUFYCcB19EoF03TTZ82HIz9WFaoA) 
on how to funnel select with _selectchanged_.
   
   Thankyou!! This is great!!! didn't know 2 events can be used together. It 
solves part of my issue. 
   Using the same example, say I click on the third and fourth item in the 
funnel, is it possible to make others "visually disabled" ( or changing there 
color to grey , but still click-able ) without using a for-loop through the 
`series-data` and adjusting opacity of elements that are not selected.


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