14 struct list_head list;
18 unsigned char r, g, b;
21 /* info about the planets in sub branches */
22 float tree_area; /* total area occupied by the tree */
23 double tree_mass; /* total mass occupied by the tree */
24 /* the amount of speed the entire tree has gained */
25 struct vector tree_speed;
28 struct planet_search_iterator {
29 struct quadtree_iterator qt_iterator;
30 struct vector limit[2];
36 extern int gravitations, optimizations;
38 #define list_to_planet(list_head) container_of((list_head), struct planet, list)
40 #define tree_to_planet(qt) container_of((qt), struct planet, tree)
42 #define qt_itr_to_planet_itr(qt) \
43 container_of((qt), struct planet_search_iterator, qt_iterator)
45 void init_planet(struct planet *p);
46 void create_planets(struct planet *p, int num, double total_mass,
48 void draw_planet(SDL_Surface *screen, const struct planet *p,
49 const struct camera *);
50 void gravitize_planet_tree(struct planet *p, double time);
51 struct planet *merge_planets(struct planet *a, struct planet *b);
52 struct planet *move_planet(struct planet *p, const double time);
53 int propagate_tree_movement(struct planet *p);
54 void print_planet(const struct planet *p);
55 struct planet *prune_planet_tree(struct planet *p);
57 int planet_spatial_compare(struct quadtree *a, struct quadtree *b);
58 int planet_search_rectangular(struct quadtree *node,
59 struct quadtree_iterator *itr);
60 void planet_draw_iterator(struct quadtree *node, struct quadtree_iterator *it);