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#ifndef GEOTESSPOSITIONLINEAR_OBJECT_H
#define GEOTESSPOSITIONLINEAR_OBJECT_H

// **** _SYSTEM INCLUDES_ ******************************************************

#include <iostream>
#include <string>
#include <fstream>
#include <vector>

// use standard library objects
using namespace std;

// **** _LOCAL INCLUDES_ *******************************************************

#include "CPPUtils.h"
#include "GeoTessUtils.h"
#include "GeoTessPosition.h"
#include "GeoTessGrid.h"
#include "InterpolatorType.h"

// **** _BEGIN GEOTESS NAMESPACE_ **********************************************

namespace geotess
{

// **** _FORWARD REFERENCES_ ***************************************************

class GeoTessModel;

// **** _CLASS DEFINITION_ *****************************************************

/**
 * \brief Implements linear interpolation in geographic dimensions of a grid.
 *
 * Implements linear interpolation in geographic dimensions of a grid.
 *
 * @author Sandy Ballard
 *
 */
class GEOTESS_EXP_IMP GeoTessPositionLinear: public GeoTessPosition
{
protected:

	/**
	 * Set vertices to the 3-element array that stores the corners of the triangle identified during
	 * the triangle walk algorithm. Horizontal coefficients are similarly set to the coefficients
	 * identified during triangle walk.
	 * @throws GeoTessException
	 */
	virtual void update2D(int tid)
	{
		const int* tv = grid.getTriangleVertexIndexes(getTriangle(tid));
		vector<int>& v = vertices[tid];
		v.clear();
		v.push_back(tv[0]);
		v.push_back(tv[1]);
		v.push_back(tv[2]);
	}

public:

	/**
	 * Standard constructor.
	 */
	GeoTessPositionLinear(GeoTessModel* model,
			const InterpolatorType& radialType);

	/**
	 * Destructor.
	 */
	virtual ~GeoTessPositionLinear();

	/**
	 * Retrieve the type of interpolation that this GeoTessPosition object is configured
	 * to perform. Either InterpolatorType.LINEAR or InterpolatorType.NATURAL_NEIGHBOR.
	 */
	virtual const InterpolatorType& getInterpolatorType() const
	{
		return InterpolatorType::LINEAR;
	}
	;

};
// end class GeoTessModelLinear

}// end namespace geotess

#endif  // GEOTESSPOSITIONLINEAR_OBJECT_H
