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geometry/line2d.cpp
51 строка
1 KB
Vladimir Byko-Ianko
[geometry] Implementation of segments intersection.
06 июн 2019, 18:03
06 июн 2019, 18:03
7ee2787
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#include "geometry/line2d.hpp" #include <cmath> #include <sstream> using namespace std; namespace m2 { namespace { bool Collinear(PointD const & a, PointD const & b, double eps) { return fabs(CrossProduct(a, b)) < eps; } } // namespace string DebugPrint(Line2D const & line) { ostringstream os; os << "Line2D [ "; os << "point: " << DebugPrint(line.m_point) << ", "; os << "direction: " << DebugPrint(line.m_direction); os << " ]"; return os.str(); } IntersectionResult Intersect(Line2D const & lhs, Line2D const & rhs, double eps) { auto const & a = lhs.m_point; auto const & ab = lhs.m_direction; auto const & c = rhs.m_point; auto const & cd = rhs.m_direction; if (Collinear(ab, cd, eps)) { if (Collinear(c - a, cd, eps)) return IntersectionResult(IntersectionResult::Type::Infinity); return IntersectionResult(IntersectionResult::Type::Zero); } auto const ac = c - a; auto const n = CrossProduct(ac, cd); auto const d = CrossProduct(ab, cd); auto const scale = n / d; return IntersectionResult(a + ab * scale); } } // namespace m2