Colony

/**

 * @file world.h

 * @author Colony Project

 *

 * @brief THE WHOLE WIDE WORLD

 *

 * Contains structures and function prototypes used

 * for managing the world.

 **/

#ifndef __WORLD_H__

#define __WORLD_H__

#include <stdarg.h>

#define ID_OFFSET -1

#define ID_RECTANGLE 3

#define ID_CIRCLE 2

#define ID_NULL 0

#define ID_POLY 1

#define POLY_DISCONNECTED 0

#define POLY_CONNECTED 1

#define POLY_RECT 2

#define NUM_SHAPES 3

#define RAY_MISS 1E30

#define CREATE(id, ...) (create_func[id](__VA_ARGS__))

#define PBBOX(b) {printf("(%g,%g) --> (%g, %g)\n",(b).p1.x,(b).p1.y,(b).p2.x,\

                                                  (b).p2.y);}

typedef struct {

    double x;

    double y;

} point_t;

typedef struct {

    point_t p1; /* Lower left point */

    point_t p2; /* Upper right point */

} bbox_t, rect_t, seg_t;

typedef struct {

    point_t p; /* origin */

    double d; /* direction */

} ray_t;

typedef struct {

    int type;

    int num_pts;

    point_t *pts;

} poly_t;

typedef struct {

    int id;

    bbox_t *bbox;

    void *props; /* shape-specific properties */

} object_t;

typedef struct {

    int max_objs;

    int cur_objs;

    object_t *objs;

    bbox_t win; 

} world_t;

/* Specific collision functions */

double collide(ray_t *ray, object_t *obj);

double collide_circle(ray_t *ray, object_t *obj);

double collide_rect(ray_t *ray, object_t *obj);

double collide_poly(ray_t *ray, object_t *obj);

/*  Array of function pointers to the specific collide functions.

 *  Must be listed in the same order as IDs */

extern double (*collide_func[NUM_SHAPES])(ray_t *ray, object_t *obj);

extern int (*create_func[NUM_SHAPES])(object_t *obj, va_list ap);

extern int (*destroy_func[NUM_SHAPES])(object_t *obj);

extern world_t world;

int init_world(int num_objs, bbox_t b);

int destroy_world(void);

int create_poly(object_t *obj, va_list ap);

int destroy_poly(object_t *obj);

object_t *create(int id, ...);

void print_world(void);

void print_object(object_t *obj);

#endif