Organic Maps sources as of 02.04.2025 (fad26bbf22ac3da75e01e62aa01e5c8e11861005)

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geometry/convex_hull.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "geometry/point2d.hpp"
+#include "geometry/segment2d.hpp"
+
+#include "base/assert.hpp"
+
+#include <vector>
+
+namespace m2
+{
+class ConvexHull
+{
+public:
+  // Builds a convex hull around |points|.  The hull polygon points are
+  // listed in the order of a counterclockwise traversal with no three
+  // points lying on the same straight line.
+  //
+  // Complexity: O(n * log(n)), where n is the number of points.
+  ConvexHull(std::vector<PointD> const & points, double eps);
+
+  size_t Size() const { return m_hull.size(); }
+  bool Empty() const { return m_hull.empty(); }
+
+  PointD const & PointAt(size_t i) const
+  {
+    ASSERT(!Empty(), ());
+    return m_hull[i % Size()];
+  }
+
+  Segment2D SegmentAt(size_t i) const
+  {
+    ASSERT_GREATER_OR_EQUAL(Size(), 2, ());
+    return Segment2D(PointAt(i), PointAt(i + 1));
+  }
+
+  std::vector<PointD> const & Points() const { return m_hull; }
+
+private:
+  std::vector<PointD> m_hull;
+};
+}  // namespace m2