[#19]:svarga:feature, add plot::donut driver with adjustable plot::hole#20
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plot::donut(labels, values, opts...) is now its own driver — a pie with a
default 0.55 inner-radius hole. Both pie and donut accept plot::hole{r} to
set/override the hole fraction (tag renamed donut_t -> hole_t). pie_view gains
a default_inner member; impl::hole_of(fallback, ...) returns the fallback when
no plot::hole{} is given. Updated example, tests (donut driver + hole override),
and docs.
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Summary
plot::donut(labels, values, opts...)is now its own driver — a pie with a default 0.55 inner-radius hole.plot::pieandplot::donutacceptplot::hole{r}(r in (0,1)) to set/override the hole fraction.donut_t→hole_tand the option structplot::donut{}(value) →plot::hole{}.pie_viewgains adefault_innermember;impl::hole_of(fallback, ...)returns the fallback when noplot::hole{}is given.Tests
ctest5/5 pass; Valgrind clean (0 errors) onplot_new+plot_fill.plot::hole{}override coverage inplot_new.cpp; donut driver inplot_fill.cppstill asserts a filled ring.Updated example (
examples/pie.cpp) and docs (doxy/docs/index.md).