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#ifndef __AKAMARU_H__
#define __AKAMARU_H__
typedef struct _xy_pair Point;
typedef struct _xy_pair Vector;
struct _xy_pair {
double x, y;
};
typedef struct _Object Object;
typedef struct _Stick Stick;
typedef struct _String String;
typedef struct _Spring Spring;
typedef struct _OffsetSpring OffsetSpring;
typedef struct _Spacer Spacer;
typedef struct _Polygon Polygon;
typedef struct _Offset Offset;
typedef struct _Model Model;
struct _Object {
Vector force;
Point position;
Point previous_position;
Vector velocity;
double mass;
double theta;
};
struct _Stick {
Object *a, *b;
int length;
};
struct _String {
Object *a, *b;
int length;
};
struct _Offset {
int num_objects;
Object **objects;
int dx, dy;
};
struct _Spring {
Object *a, *b;
int length;
};
struct _OffsetSpring {
Object *a, *b;
int dx, dy;
};
struct _Spacer {
Object *a, *b;
int length;
};
struct _Polygon {
int num_points;
Point *points;
Vector *normals;
int edge;
};
struct _Model {
int num_objects;
Object *objects;
int num_sticks;
Stick *sticks;
int num_strings;
String *strings;
int num_offsets;
Offset *offsets;
int num_springs;
Spring *springs;
int num_offset_springs;
OffsetSpring *offset_springs;
int num_spacers;
Spacer *spacers;
int num_polygons;
Polygon *polygons;
double k;
double friction;
Object *anchor_object;
Vector anchor_position;
double theta;
};
void object_init (Object *object, double x, double y, double mass);
void offset_spring_init (OffsetSpring *spring,
Object *a, Object *b, double dx, double dy);
void spring_init (Spring *spring, Object *a, Object *b, double length);
void stick_init (Stick *stick, Object *a, Object *b, double length);
void string_init (String *string, Object *a, Object *b, double length);
void spacer_init (Spacer *spacer, Object *a, Object *b, double length);
void polygon_init (Polygon *p, int num_points, ...);
void polygon_init_diamond (Polygon *polygon, double x, double y);
void polygon_init_rectangle (Polygon *polygon, double x0, double y0,
double x1, double y1);
void model_fini (Model *model);
void model_step (Model *model, double delta_t);
Object *model_find_nearest (Model *model, double x, double y);
#endif
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