shp-polygon.h

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/*
 * Read ESRI shapefiles
 *
 * Copyright (C) 2023 Andreas Vögele
 *
 * This library is free software; you can redistribute it and/or modify it
 * under either the terms of the ISC License or the same terms as Perl.
 */
 
/* SPDX-License-Identifier: ISC OR Artistic-1.0-Perl OR GPL-1.0-or-later */
 
#ifndef _SHAPEREADER_SHP_POLYGON_H
#define _SHAPEREADER_SHP_POLYGON_H
 
#include "shp-point.h"
#include <stddef.h>
 
typedef struct shp_polygon_t {
    double x_min;       
    double x_max;       
    double y_min;       
    double y_max;       
    size_t num_parts;   
    size_t num_points;  
    const char *parts;  /* Index to first point in part */
    const char *points; /* X and Y coordinates */
} shp_polygon_t;
 
extern size_t shp_polygon_points(const shp_polygon_t *polygon,
                                 size_t part_num, size_t *start, size_t *end);
 
extern void shp_polygon_point(const shp_polygon_t *polygon, size_t point_num,
                              shp_point_t *point);
 
extern int shp_point_in_polygon(const shp_point_t *point,
                                const shp_polygon_t *polygon);
 
#endif