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- /****************************************************************/
- /* */
- /* point.h in ~/src/Glos */
- /* */
- /* This header file defines the data structure of a */
- /* point (structure containing various attributes of */
- /* a grid cell). */
- /* */
- /****************************************************************/
- struct point
- {
- double orientation;
- /* horizontal angle(degrees) measured from +ve x-axis */
- double inclination;
- /* vertical angle(degrees) from the viewing point */
- int x; /* x-coor measured from viewing point location */
- int y; /* y-coor measured from viewing point location */
- struct point *next; /* pointer to next point in list */
- struct point *previous; /* ptr to previous pt. in list */
- };
- /* make_point.c */
- struct point *make_point(double, double, int, int);
- #ifdef GRASS_SEGMENT_H
- /* delete.c */
- struct point *delete(struct point *, struct point *, SEGMENT *, int, int);
- /* make_list.c */
- struct point *make_list(struct point *, int, int, SEGMENT *, int, int, int,
- int, int, double);
- /* mark_pts.c */
- int mark_visible_points(struct point *, SEGMENT *, int, int, double, double);
- /* pts_elim.c */
- struct point *hidden_point_elimination(struct point *, int, SEGMENT *,
- SEGMENT *, SEGMENT *, int, int, int,
- int, int, int, int, double);
- /* segment.c */
- struct point *segment(int, int, int, double, double,
- int, int, int, int, SEGMENT *, SEGMENT *, SEGMENT *,
- int, int, int, int, double);
- /*
- For delayed deletion of points (see delete3.c).
- Initially set to NULL in main.c.
- */
- extern struct point *DELAYED_DELETE;
- #endif
- /****************************************************************/
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