geom.h

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#ifndef NAVIT_GEOM_H
#define NAVIT_GEOM_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "attr.h"
#include "config.h"
#include "coord.h"
#include "item.h"
#include <glib.h>
 
#define sq(x) ((double)(x) * (x))
 
struct rect {
    struct coord l, h;
};
 
enum geom_poly_segment_type {
    geom_poly_segment_type_none,
    geom_poly_segment_type_way_inner,
    geom_poly_segment_type_way_outer,
    geom_poly_segment_type_way_left_side,
    geom_poly_segment_type_way_right_side,
    geom_poly_segment_type_way_unknown,
};
 
struct geom_poly_segment {
    enum geom_poly_segment_type type;
    struct coord *first, *last;
};
/* prototypes */
void geom_coord_copy(struct coord *from, struct coord *to, int count, int reverse);
void geom_coord_revert(struct coord *c, int count);
int geom_line_middle(struct coord *p, int count, struct coord *c);
long long geom_poly_area(struct coord *c, int count);
int geom_poly_centroid(struct coord *c, int count, struct coord *r);
int geom_poly_point_inside(struct coord *cp, int count, struct coord *c);
int geom_poly_closest_point(struct coord *pl, int count, struct coord *p, struct coord *c);
GList *geom_poly_segments_insert(GList *list, struct geom_poly_segment *first, struct geom_poly_segment *second,
                                 struct geom_poly_segment *third);
void geom_poly_segment_destroy(struct geom_poly_segment *seg, void *unused);
GList *geom_poly_segments_remove(GList *list, struct geom_poly_segment *seg);
int geom_poly_segment_compatible(struct geom_poly_segment *s1, struct geom_poly_segment *s2, int dir);
GList *geom_poly_segments_sort(GList *in, enum geom_poly_segment_type type);
int geom_poly_segments_point_inside(GList *in, struct coord *c);
int geom_clip_line_code(struct coord *p1, struct coord *p2, struct rect *r);
int geom_is_inside(struct coord *p, struct rect *r, int edge);
void geom_poly_intersection(struct coord *p1, struct coord *p2, struct rect *r, int edge, struct coord *ret);
void geom_init(void);
/* end of prototypes */
#ifdef __cplusplus
}
#endif
 
#endif