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#ifndef __FACECIRCULATOR_H__

#define __FACECIRCULATOR_H__

#include "Vertex.h"

#include "HalfEdge.h"

#include "Face.h"

namespace HMesh

{

	/** \brief Circulator to move around a face. 

	A circulator is similar to an iterator. 

	The circulator maintains state telling us where we are on a face.

	We can get the current vertex or halfedge. NOTE: convenience 

	functions for getting the opposite halfedge and adjacent face

	would be nice. */

	class FaceCirculator

	{

		HalfEdgeIter last;

		HalfEdgeIter he;

		int steps;

		public:

		/** Construct a face iterator from a face f.

				This iterator moves around f starting from the (arbitrary) halfedge

				indicated by f. */

		FaceCirculator(FaceIter f): 

			last(f->last), 

				 he(last),

				 steps(0) {}

		/** Construct a face iterator from a halfedge h.

				This iterator moves around f starting from h. */

		FaceCirculator(HalfEdgeIter h): 

			last(h), 

			he(last),

			steps(0) {}

		/// Return current vertex pointed to by circulator.

		VertexIter get_vertex() const { return he->vert;}

		/// Return current halfedge pointed to by circulator

		HalfEdgeIter get_halfedge() const { return he->next;}

		/** Return current face pointed to by circulator. I.e.

				The adjacent face across the current halfedge. */

		FaceIter get_face() const {return he->next->opp->face;}

		/// Increment circulator.

		void operator++() {he=he->next;++steps;}

		/// Increment circulator.

		void operator++(int) {he=he->next;++steps;}

		/// Has circulator come full circle?

		bool end() const {return he==last && steps > 0;}

		/// Return number of steps.

		int no_steps() const {return steps;}

	};

}

#endif