How can I represent a vector equation of a line segment in C++?

Question

I am working with computer graphics.

I would like to represent a line with two end points, and, then I would like my Line2d class to have a method that

Answer 1

There are many forms of line representation.

If you mean line (not segment), then, probably, you'll find convenient to use class/structure, containing BasePoint and UnitDirectionVector.

For line segments, choose between (Point pt0, Point pt1) form, and, (Point pt, Vector v = pt1 - pt0) form.

The second one is more suitable for parametric approach like, X = P0.X + t * D.X etc.