minimum translation vector between aabb's

gistfile1.c

vec_t Col_RectRect(const rectangle_t* a, const rectangle_t* b) {
	vec_t ret;
	float left, right, top, bottom;

	// zero the vector
	ret.x = 0;
	ret.y = 0;

	// axis

	left = b->min.x - a->max.x;
	right = b->max.x - a->min.x;
	bottom = b->min.y - a->max.y;
	top = b->max.y - a->min.y;

	if (abs(left) > right) {
		ret.x = right;
	} else {
		ret.x = left;
	}

	if (abs(bottom) > top) {
		ret.y = top;
	} else {
		ret.y = bottom;
	}

	if (abs(ret.x) <= abs(ret.y)) {
		ret.y = 0;
	} else {
		ret.x = 0;
	}


	return ret;
}