Question

I have two points A,B so they form a line AB. I’d like to know how to calculate a point in distance d on axis of this line.

This question gives the answer for rotating a point in 2D: c# – how to move point a given distance d (and get a new coordinates)

So I can get the mid of line AB and rotate it. But I need to find out, by how many degrees I need to rotate – 90 or 180.

How can I do it in 3D/gps coords?

http://postimage.org/image/bt9zdway3/

any ideas?

Answer 1

I’ve calculated center C of line AB then then translated C to desired distance C’ and rotated C’ around original C. Probably there is easier way but it worked for me