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

v2 = v2:add(v2b)
v2 = v2:add(v2b,r)

Add v2b to v2.

If r is provided then the result is written into r and returned otherwise v2 is modified and returned.

value = v2:cross(v2b)

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 = v2:dot(v2b)

Return the dot product of these two vectors.

v2 = v2:identity()

Set this v2 to all zeros.

value = v2:len()

Returns the length of this vector.

value = v2:lenlen()

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

v2 = v2:mul(v2b)
v2 = v2:mul(v2b,r)

Multiply v2 by v2b.

If r is provided then the result is written into r and returned otherwise v2 is modified and returned.

v2 = tardis.v2.new()

Create a new v2 and optionally set it to the given values, v2 methods usually return the input v2 for easy function chaining.

v2 = v2:normalize()
v2 = v2: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 v2 is modified and returned.

v2 = v2:oo()
v2 = v2: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 v2 is modified and returned.

v2 = v2:scale(s)
v2 = v2:scale(s,r)

Scale this v2 by s.

If r is provided then the result is written into r and returned otherwise v2 is modified and returned.

v2 = v2:sub(v2b)
v2 = v2:sub(v2b,r)

Subtract v2b from v2.

If r is provided then the result is written into r and returned otherwise v2 is modified and returned.