c# - Find the required angle of rotation to move from point A to point B

Question

I want to make a bot that will walk along points from two coordinates (X and Y), I have the coordinates of the character, his rotation angle (1-180 / (- 1) - (-180)), and the required point where he is should get there. How do I know if the angle of rotation is necessary for the person to look directly at the point?

I have been sitting with this for a long time, and my head refuses to think at all, I tried to solve this by creating an angle between the radius vector, but nothing came of it.

  public static double GetRotation(Point Destination)
    {
          double cos = Destination.Y / Math.Sqrt(Destination.X * Destination.X + Destination.Y * Destination.Y);
          double angle = Math.Acos(cos);
        return angle;
    }

question from:https://stackoverflow.com/questions/65926335/find-the-required-angle-of-rotation-to-move-from-point-a-to-point-b

Answer 1

dx = Destination.X - Person.X;
dy = Destination.Y - Person.Y;
directionangle = Math.Atan2(dy, dx); // in radians!
degrees = directionangle * 180 / Math.PI;