The Friendly Monster
Member
Nope, two points define a line segment, not a vector. You can calculate a difference vector from two points but it would be very odd to store (or think of) a vector as two points.True, you need a direction for it to be a vector but to get the direction you need a second point otherwise it's just a single point with no information where it's going.
The vectors from (1, 0) to (1, 1) and (0, 0) to (0, 1) are both (0, 1), the same vector. A vector does not have a "start point", just a (non-negative) magnitude and direction.