Hi @Neur1n, although this is not the right/best place to ask this kind of user questions I was curious enough to complete your code and run it. I'll post my results in a follow-up message.

That said, following is the "standard reply" to user questions, please follow the advice if you have further questions:

This is the wrong place to ask questions about building or running programs with FLTK (user support). FLTK "issues" are reserved for bug reports and requests for enhancements, for further information please visit https://www.fltk.org/bugs.php.

Please ask user questions in our user group fltk.general. Your question will have a wider audience and you will likely get more and quicker replies.

Please include the system/platform (Windows, Linux, macOS), the build system (Visual Studio, CMake, Ninja), compiler (gcc, clang), compiler version, and build error messages in text form (copy and paste preferred). TIA.

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