src/geo2d/tan/cc_in/lib.hpp
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|---|---|---|---|
| 1 | #pragma once | ||
| 2 | |||
| 3 | #include "../../ds/c/lib.hpp" | ||
| 4 | #include "../../ds/l/lib.hpp" | ||
| 5 | #include "../cp/lib.hpp" | ||
| 6 | |||
| 7 | namespace tifa_libs { | ||
| 8 | |||
| 9 | // internal tagante lines of 2 disjoint circles | ||
| 10 | // maybe 0, 2 (maybe duplicate) | ||
| 11 | template <class FP> | ||
| 12 | 40 | CEXP auto intan_CC(circle<FP> CR c1, circle<FP> CR c2) NE { | |
| 13 | 40 | std::optional<ptt<line<FP>>> ret; | |
| 14 |
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40 | if (is_eq(c1.o.x, c2.o.x) && is_eq(c1.o.y, c2.o.y)) return ret; |
| 15 | 39 | const point p = (c1.o * c2.r + c2.o * c1.r) / (c1.r + c2.r); | |
| 16 | 39 | const auto ps = tan_CP(c1, p), qs = tan_CP(c2, p); | |
| 17 |
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39 | if (!ps || !qs) return ret; |
| 18 | // c1 counter-clock wise | ||
| 19 | 22 | ret.emplace(line{ps->first, qs->first}, line{ps->second, qs->second}); | |
| 20 | 22 | return ret; | |
| 21 | } | ||
| 22 | |||
| 23 | } // namespace tifa_libs | ||
| 24 |