Assume that we have have this grid with coordinates.

We start at 0.0 (it's actully 0,0 but my Libre Office cannot handle 0,0 due to my settings) and we want to go to -3.10
Is there any search algorithm for this type of problem? Start position and stop position can change too.
This is a math question and I'm pretty sure that this is well used in game development, but I have not found any algorithm that can handle these kind of problems.