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If you're developing a windows application that deals with pen input the overall choice is an issues you'll need to face are challenging.
In this section I'll try to capture everything I've learned as I've implemented various pen-aware applications.
The motivation for getting this documentation together comes from the challenges I discovered: Challenges developing pen-aware applications on windows
Windows Pen API Landscape — Comprehensive comparison of all Windows pen input APIs (Wintab, WM_POINTER, WinUI, WPF, RealTimeStylus)
Framework-Specific Pen Input Routing — Why WM_POINTER doesn't work in WinUI/WPF/WinForms/Avalonia, and what to use instead
Rendering Approaches for Pen Apps — Bitmap-backed vs retained mode, SkiaSharp pattern, framework comparison
DPI Awareness and Pen Coordinates — The #1 source of pen coordinate bugs
WM_POINTER Event Coalescing — Why strokes look like polygons and how to fix it
Wintab Gotchas — 12 hard-won lessons from implementing Wintab
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