/*
  This file is part of CDO. CDO is a collection of Operators to
  manipulate and analyse Climate model Data.

  Copyright (C) 2003-2020 Uwe Schulzweida, <uwe.schulzweida AT mpimet.mpg.de>
  See COPYING file for copying and redistribution conditions.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; version 2 of the License.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
*/
#ifndef VERIFYGRID_H
#define VERIFYGRID_H

struct Point   { double x, y; };
struct Point3D { double X, Y, Z; };

int get_actual_number_of_corners(int ncorner, const Varray<Point3D> &cell_corners_xyz_open_cell);
int get_no_duplicates(int actual_number_of_corners, const Varray<Point3D> &cell_corners_xyz_open_cell, std::vector<bool> &marked_duplicate_indices);
void copy_unique_corners(int actual_number_of_corners, const Varray<Point3D> &cell_corners_xyz_open_cell, std::vector<bool> &marked_duplicate_indices,
                         Varray<Point3D> &cell_corners_xyz_without_duplicates);

void set_cell_corners_xyz(int ncorner, const double *cell_corners_lon, const double *cell_corners_lat, Varray<Point3D> &cell_corners_xyz);
void set_center_point_plane_projection(int coordinate_to_ignore, const Point3D &center_point_xyz, Point &center_point_plane_projection);
void set_cell_corners_plane_projection(int coordinate_to_ignore, int ncorner, const Varray<Point3D> &cell_corners_xyz, Varray<Point> &cell_corners_plane_projection);
int find_coordinate_to_ignore(const Varray<Point3D> &cell_corners_xyz);
double calculate_the_polygon_area(const Varray<Point> &cell_corners, int number_corners);
bool are_polygon_vertices_arranged_in_clockwise_order(double cell_area);
int winding_numbers_algorithm(const Varray<Point> &cell_corners, int number_corners, const Point &point);

#endif /* VERIFYGRID_H */
