Calculate direction vector

Question

HI All,

How can I calculate direction vector of a line segment, defined by start point (x1, y1) and end point (x2, y2)?

Cheers.

Answer 1

(x2 - x1, y2 - y1)

If you want the unit direction vector, divide each component by sqrt((x2 - x1)² + (y2 - y1)²).