Repo created

libs/geometry/diamond_box.hpp

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+#pragma once
+
+#include "geometry/bounding_box.hpp"
+#include "geometry/point2d.hpp"
+
+#include "base/visitor.hpp"
+
+#include <vector>
+
+namespace m2
+{
+// Bounding box for a set of points on the plane, rotated by 45
+// degrees.
+class DiamondBox
+{
+public:
+  DiamondBox() = default;
+  explicit DiamondBox(std::vector<PointD> const & points);
+
+  void Add(PointD const & p) { return Add(p.x, p.y); }
+  void Add(double x, double y) { return m_box.Add(x + y, x - y); }
+
+  bool HasPoint(PointD const & p) const { return HasPoint(p.x, p.y); }
+  bool HasPoint(double x, double y) const { return m_box.HasPoint(x + y, x - y); }
+
+  bool HasPoint(PointD const & p, double eps) const { return HasPoint(p.x, p.y, eps); }
+
+  bool HasPoint(double x, double y, double eps) const { return m_box.HasPoint(x + y, x - y, 2 * eps); }
+
+  std::vector<m2::PointD> Points() const
+  {
+    auto points = m_box.Points();
+    for (auto & p : points)
+      p = ToOrig(p);
+    return points;
+  }
+
+  bool operator==(DiamondBox const & rhs) const { return m_box == rhs.m_box; }
+
+  DECLARE_VISITOR(visitor(m_box, "box"))
+  DECLARE_DEBUG_PRINT(DiamondBox)
+
+private:
+  static m2::PointD ToOrig(m2::PointD const & p) { return m2::PointD(0.5 * (p.x + p.y), 0.5 * (p.x - p.y)); }
+
+  BoundingBox m_box;
+};
+}  // namespace m2