How to calculate the coordinate at the center of the path element?

Question

JavaScript

Good night guys! With the help of svg.js I draw path.
I need to find out the coordinate at the center of this element, not knowing its dimensions, but knowing the start coordinate of the line from the top left and the end coordinate of the line from the top left.
A small example of how to build a line for me:

// Откуда построить линию
var where = {
  top: 100,
  left: 100
};

// Куда построить линию
var from = {
  top: 350,
  left: 450
};

Answer 1

midpoint