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#ifndef GRASS_DdglGraph_s_H
#define GRASS_DdglGraph_s_H
/* pg comes from "planar graph" */
/* every edge is directed. Nevertheless, we can visit it on both sides */
struct pg_edge {
int v1; /* first vertex */
int v2; /* second vertex */
char visited_left;
char visited_right;
char winding_left; /* winding numbers */
char winding_right;
};
struct pg_vertex {
double x; /* coordinates */
double y;
int ecount; /* number of neighbours */
int eallocated; /* size of the array below */
struct pg_edge **edges; /* array of pointers */
double *angles; /* precalculated angles with Ox */
};
struct planar_graph {
int vcount; /* number of vertices */
struct pg_vertex *v;
int ecount;
int eallocated;
struct pg_edge *e;
};
struct planar_graph *pg_create_struct(int n, int e);
void pg_destroy_struct(struct planar_graph *pg);
int pg_existsedge(struct planar_graph *pg, int v1, int v2);
void pg_addedge(struct planar_graph *pg, int v1, int v2);
struct planar_graph *pg_create(const struct line_pnts *Points);
#endif
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