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+/*
+ This file is part of the MinGfx Project.
+
+ Copyright (c) 2017,2018 Regents of the University of Minnesota.
+ All Rights Reserved.
+
+ Original Author(s) of this File:
+ David Schroeder, 2010-ish, University of Minnesota
+
+ Author(s) of Significant Updates/Modifications to the File:
+ Dan Keefe, 2018, University of Minnesota
+ ...
+ */
+
+#ifndef SRC_AABB_H_
+#define SRC_AABB_H_
+
+#include "point3.h"
+#include "vector3.h"
+
+namespace mingfx {
+
+// forward declaration
+class Mesh;
+
+/** A 3D axis-aligned bounding box defined by two corners (min and max). AABBs
+ can be added together using the + operator to make them grow to cover the
+ extents of both boxes. Each box can also store a user_id (int), which can be
+ used to associate the box with some other object in your program.
+ */
+class AABB {
+public:
+ /// Creates an empty box.
+ AABB();
+
+ /// Box that contains a single point
+ AABB(const Point3 &a);
+
+ /// Box that contains a triangle defined by 3 points
+ AABB(const Point3 &a, const Point3 &b, const Point3 &c);
+
+ /// Box centered at the origin with width, height, and depth specified by
+ /// the vector.
+ AABB(const Vector3 &extents);
+
+ /// Box centered at the center with width, height, and depth specified by
+ /// the vector.
+ AABB(const Point3 &center, const Vector3 &extents);
+
+ /// Box that contains a whole mesh
+ AABB(const Mesh &mesh);
+
+ /// Box that contains just triangle number "tri_id" from the specified mesh.
+ AABB(const Mesh &mesh, unsigned int tri_id);
+
+ virtual ~AABB();
+
+ /// Returns the dimensions of the box in x, y, and z as a 3D vector.
+ Vector3 Dimensions() const;
+
+ /// Returns the volume of the box or -1.0 when empty and 0.0 if the box
+ /// contains just a single point.
+ float Volume() const;
+
+ /// Returns the coordinates for the minimum corner of the box.
+ Point3 min() const;
+
+ /// Returns the coordinates for the maximum corner of the box.
+ Point3 max() const;
+
+ /// You can set this to whatever you want in order to use it as a handle
+ /// into your own program. The intent is to make it possible for you to
+ /// associate this AABB with the id of some object in your application.
+ void set_user_data(int data);
+
+ /// You can set this to whatever you want in order to use it as a handle
+ /// into your own program. The intent is to make it possible for you to
+ /// associate this AABB with the id of some object in your application.
+ int user_data();
+
+private:
+
+ Point3 min_, max_;
+
+ int user_data_;
+
+ friend AABB operator+(const AABB &A, const AABB &B);
+};
+
+// Returns an AABB that contains both A and B completely (kind of like a union)
+AABB operator+(const AABB &A, const AABB &B);
+
+
+} // end namespace
+
+#endif