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The symbol_size method in Line should accept a function as a parameter. However, the current implementation uses a fixed f64, which limits the ability to dynamically customize the symbol size.
![image](https://private-user-images.githubusercontent.com/17229609/375615086-243298a6-9400-4507-b764-161dfc42bad0.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.YUUZop1ItvJkb_wTIdp8UevRrXJeADbIiofdNUbzypU)
I added related example in gallery/src/line/different_symbols.rs: