// Functions to write grid2DPoints3D as a Geomview .off file.

#ifndef WRITE_GRID2D_OFF_H
#define WRITE_GRID2D_OFF_H

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

#include "grid2DPoints3D.h"


// ********************************************************************************
// Class WRITE_GRID2D_OFF
// ********************************************************************************

/// A class for writing GRID2D_POINTS3D as a Geomview .off file.
class WRITE_GRID2D_OFF {

public:

    const std::string OFF_HEADER = "OFF";

    WRITE_GRID2D_OFF() {}

    std::string Header() const { return OFF_HEADER; }

    /// Write the OFF file header line.
    void WriteHeader(std::ostream& file) const;

    /// Write a comment line.
    void WriteComment(std::ostream& file, const std::string& msg) const;

    /// Write the counts: num_points, num_quads, 0 (edges).
    void WriteNumElements(std::ostream& file,
                          const GRID2D_POINTS3D& grid2D) const;

    /// Write the coordinates of all grid points.
    void WritePointCoordinates(std::ostream& file,
                                const GRID2D_POINTS3D& grid2D) const;

    /// Write the grid quadrilaterals.
    void WriteQuadrilaterals(std::ostream& file,
                              const GRID2D_POINTS3D& grid2D) const;

    /// Write grid2D to an open Geomview .off file stream.
    void Write(std::ostream& file,
               const GRID2D_POINTS3D& grid2D,
               const std::vector<std::string>& comment_list) const;

    /// Open filename and write grid2D in Geomview .off format.
    void OpenAndWrite(const std::string& filename,
                      const GRID2D_POINTS3D& grid2D,
                      const std::vector<std::string>& comment_list) const;
};

#endif // WRITE_GRID2D_OFF_H