fltk-theme

All of those look broken, especially the "classic" one but all of them have issues. They look like a bitmap-based theme engine tried to do arbitrary scaling of bitmaps without even bilinear filtering (which, don't get me wrong, would also look bad - but this looks even worse). Except it seems that they are defined in code[0], calling FLTK functions (these draw_xxx functions are wrappers/bindings for Fl_xxx functions). I'm not sure where exactly things break, the code (at least the linked one) seems mostly straightforward. Does FLTK try to scale draw call coordinates? While scaling coordinates is helpful in general, for low level drawing like implementing themes, it should be disabled and have the themes handle scaling themselves in a way that doesn't look like someone applied widths and heights randomly. I wonder if this is an FLTK limita

The default FLTK look and feel might be discouraging, but there are some really great native themes shipped for the Rust bindings: https://github.com/fltk-rs/fltk-theme?tab=readme-ov-file#wid...

go-fltk does build and run on Windows, pretty well actually. For a native toolkit, I was impressed to see FLTK supports Ctrl-+ and Ctrl+- to zoom the entire application like a browser. And https://github.com/fltk-rs/fltk-theme?tab=readme-ov-file#wid... really improved my impression of how "native" FLTK can be made to look. On a related note, I discovered GoVCL https://z-kit.cc/en/ recently and am interested to try it out.

> I haven't seen an FLTK app in years. FLTK still widely used in various scientific apps. > Does FLTK still look like it came from the 1990's/early 2000's, or did they upgrade the widgets to make them look more modern? Probably the same. For example, here is screenshot[0] of the OpenVSP[1] - an actively maintained parametric 3D CAD app by NASA.[2] But also there is `fl_imgtk` — a small library for FLTK image toolkit, designed to use some useful effects in FLTK GUI (better image, better speed, better quality).[3] Yet another thing is `fltk-rs`[4] - Rust binding to FLTK, with custom theming module.[5] [0] https://twitter.com/app4soft/status/1352349523549577219 [1] https://github.com/openvsp/openvsp [2] http://openvsp.org [3] https://github.com/rageworx/fl_imgtk [4] https://github.com/fltk-rs [5] https://github.com/fltk-rs/fltk-theme