/*
===========================================================================

Project:   Generic Polygon Clipper

           A new algorithm for calculating the difference, intersection,
           exclusive-or or union of arbitrary polygon sets.

File:      gpc.h
Author:    Alan Murta (email: gpc@cs.man.ac.uk)
Version:   2.32
Date:      17th December 2004

Copyright: (C) Advanced Interfaces Group,
           University of Manchester.

           This software is free for non-commercial use. It may be copied,
           modified, and redistributed provided that this copyright notice
           is preserved on all copies. The intellectual property rights of
           the algorithms used reside with the University of Manchester
           Advanced Interfaces Group.

           You may not use this software, in whole or in part, in support
           of any commercial product without the express consent of the
           author.

           There is no warranty or other guarantee of fitness of this
           software for any purpose. It is provided solely "as is".

===========================================================================
*/

#ifndef __gpc_h
#define __gpc_h

#include <stdio.h>


/*
===========================================================================
                               Constants
===========================================================================
*/

/* Increase GPC_EPSILON to encourage merging of near coincident edges    */

#define GPC_EPSILON (DBL_EPSILON)

#define GPC_VERSION "2.32"


/*
===========================================================================
                           Public Data Types
===========================================================================
*/

typedef enum                        /* Set operation type                */
{
  GPC_DIFF,                         /* Difference                        */
  GPC_INT,                          /* Intersection                      */
  GPC_XOR,                          /* Exclusive or                      */
  GPC_UNION                         /* Union                             */
} gpc_op;

typedef struct                      /* Polygon vertex structure          */
{
  double              x;            /* Vertex x component                */
  double              y;            /* vertex y component                */
} gpc_vertex;

typedef struct                      /* Vertex list structure             */
{
  int                 num_vertices; /* Number of vertices in list        */
  gpc_vertex         *vertex;       /* Vertex array pointer              */
} gpc_vertex_list;

typedef struct                      /* Polygon set structure             */
{
  int                 num_contours; /* Number of contours in polygon     */
  int                *hole;         /* Hole / external contour flags     */
  gpc_vertex_list    *contour;      /* Contour array pointer             */
} gpc_polygon;

typedef struct                      /* Tristrip set structure            */
{
  int                 num_strips;   /* Number of tristrips               */
  gpc_vertex_list    *strip;        /* Tristrip array pointer            */
} gpc_tristrip;

/*
===========================================================================
                           TCL compatibility
===========================================================================
*/

/*
===========================================================================
                       Public Function Prototypes
===========================================================================
*/

void gpc_read_polygon        (FILE            *infile_ptr,
                              int              read_hole_flags,
                              gpc_polygon     *polygon);

void gpc_write_polygon       (FILE            *outfile_ptr,
                              int              write_hole_flags,
                              gpc_polygon     *polygon);

void gpc_add_contour         (gpc_polygon     *polygon,
                              gpc_vertex_list *contour,
                              int              hole);

void gpc_polygon_clip        (gpc_op           set_operation,
                              gpc_polygon     *subject_polygon,
                              gpc_polygon     *clip_polygon,
                              gpc_polygon     *result_polygon);

void gpc_tristrip_clip       (gpc_op           set_operation,
                              gpc_polygon     *subject_polygon,
                              gpc_polygon     *clip_polygon,
                              gpc_tristrip    *result_tristrip);

void gpc_polygon_to_tristrip (gpc_polygon     *polygon,
                              gpc_tristrip    *tristrip);

void gpc_free_polygon        (gpc_polygon     *polygon);

void gpc_free_tristrip       (gpc_tristrip    *tristrip);

/*
===========================================================================
                           TCL compatibility functions
===========================================================================
*/

//vertex
gpc_vertex_list   gpc_vertex_list_make        (int n);
int               gpc_vertex_num_get          (gpc_vertex_list *list);
void              gpc_vertex_set              (gpc_vertex_list *list, int n, double x, double y);
#ifdef SWIG
%apply double *OUTPUT {double *x, double *y };
#endif
void              gpc_vertex_get              (gpc_vertex_list *list, int n, double *x, double *y);
#ifdef SWIG
%clear double *x;
%clear double *y;
#endif

//polygon
gpc_polygon     * gpc_polygon_empty_make      ();
int               gpc_polygon_num_get         (gpc_polygon *polygon);
gpc_vertex_list   gpc_polygon_vertex_list_get (gpc_polygon *polygon, int n);

//functions taken from https://github.com/jraedler/Polygon3
void              gpc_polygon_rotate          (gpc_polygon *p, double alpha, double xc, double yc);
void              gpc_polygon_scale           (gpc_polygon *p, double xs, double ys, double xc, double yc);
void              gpc_polygon_shift           (gpc_polygon *p, double x, double y);

//misc
int               gpc_write_polygon_tcl       (const char *filename, gpc_polygon *polygon);
#endif

/*
===========================================================================
                           End of file: gpc.h
===========================================================================
*/