#include "vec.h"

void vec_cpy(Vec *destination, Vec source)
{
	destination->x = source.x;
	destination->y = source.y;
}

void vec_add(Vec *vector, Vec force)
{
	vector->x += force.x;
	vector->y += force.y;
}

void vec_sub(Vec *vector, Vec force)
{
	vector->x -= force.x;
	vector->y -= force.y;
}

void vec_mul(Vec *vector, float scale)
{
	vector->x *= scale;
	vector->y *= scale;
}

void vec_div(Vec *vector, float scale)
{
	vector->x /= scale;
	vector->y /= scale;
}

void vec_lerp(Vec *from, Vec to, float scale)
{
	/* from * (1 - scale) + temp * scale */
	Vec temp;
	vec_cpy(&temp, to);
	/* from * (1 - scale) */
	vec_mul(from, 1 - scale);
	/* temp * scale */
	vec_mul(&temp, scale);
	/* add */
	vec_add(from, temp);
}