Is it possible to measure distance to an image point?

So I have been using distance(object1.x,object1.y,obect2.x,object2.y) but is their a way to use image points?

Example if I made image points

1 2

0

4 3

Or do I have to add in math to each distance(object1.x-25,object1.y-25,object2.x,object2.y) to use image point 1

Ha! Ok thanks. It makes sense that you could pick the X & Y of two different points (0) & (1) etc.