jtmm2/include/vec.h

#ifndef _DEF_VEC
#define _DEF_VEC

typedef struct Vec
{
	float x;
	float y;
} Vec;

/* like memcpy but for vectors */
void vec_cpy(Vec *destination, Vec source);

/* apply a force on a vector */
void vec_add(Vec *vector, Vec force);

/* apply the opposite of a force on a vector */
void vec_sub(Vec *vector, Vec force);

/* multiply a vector by a scale */
void vec_mul(Vec *vector, float scale);

/* divise a vector by a scale */
void vec_div(Vec *vector, float scale);

/* Linear interpolation between two vectors.
 * Require a scale ranging from 0 to 1 (0 is instant, 1 is completly still). */
void vec_lerp(Vec *from, Vec to, float scale);

#endif /* _DEF_VEC */