flying-balls/gravity.h

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#ifndef GRAVITY_H_INCLUDED
#define GRAVITY_H_INCLUDED
#include "balls.h"
struct gravity_vector {
double x;
double y;
};
extern void gravity_constant_field (double x, double y);
extern void gravity_newton_field (double r, double g);
extern void gravity_get_vector (struct gravity_vector * v, const struct ball * b);
extern void gravity_draw (cairo_t * cr);
extern void gravity_change (double dx, double dy);
extern void gravity_show ();
extern void gravity_collisions (struct ball * begin, struct ball * end);
#endif