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There's not much point in re-requesting the drawing context from the offscreen canvas at the start of each drawing operation. The canvas keeps the context around and returns it on every call to getContext(), so we may as well just keep our reference to it too. This does mean that the front-end won't detect puzzles drawing outside of a redraw operation, but I think it's the mid-end's job to assert things like that. Rumours that I'm doing this because I had a mysterious bug whereby ctx was unexpectedly null are entirely true.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.