The metatable for a 2d vector class, use the new function to actually create an object.

We also inherit all the functions from tardis.array

v1 = v1:add(v1b)
v1 = v1:add(v1b,r)

Add v1b to v1.

If r is provided then the result is written into r and returned otherwise v1 is modified and returned.

value = v1:cross(v1b)

Extend to 3d then only return z value as x and y are always 0

value = a:distance(b)

Returns the length of the vector between a and b.

value = v1:dot(v1b)

Return the dot product of these two vectors.

v1 = v1:identity()

Set this v1 to all zeros.

value = v1:len()

Returns the length of this vector.

value = v1:lenlen()

Returns the length of this vector, squared, this is often all you need for comparisons so lets us skip the sqrt.

v1 = v1:mul(v1b)
v1 = v1:mul(v1b,r)

Multiply v1 by v1b.

If r is provided then the result is written into r and returned otherwise v1 is modified and returned.

v1 = v1:normalize()
v1 = v1:normalize(r)

Adjust the length of this vector to 1.

An input length of 0 will remain at 0.

If r is provided then the result is written into r and returned otherwise v1 is modified and returned.

v1 = v1:oo()
v1 = v1:oo(r)

One Over value. Build the reciprocal of all elements.

If r is provided then the result is written into r and returned otherwise v1 is modified and returned.

v1 = v1:scale(s)
v1 = v1:scale(s,r)

Scale this v1 by s.

If r is provided then the result is written into r and returned otherwise v1 is modified and returned.

v1 = v1:sub(v1b)
v1 = v1:sub(v1b,r)

Subtract v1b from v1.

If r is provided then the result is written into r and returned otherwise v1 is modified and returned.