This algorithm takes coordinates of two points and links them using DDA algorithm.
Won't draw anything if x1, y1 and x2, y2 line coordinates are equal (is a point).

On the internet I found some DDA algortihms, that were not working propely,
taken some ideas from Akshay Upadhyay (http://www.cprogramto.com/c-program-for-dda-algorithm/)
and Chandan Kumar (https://se.mathworks.com/matlabcentral/fileexchange/25524-line-drawing-by-dda/content/DDA_Line.m)
and implemented my own DDA algorithm version. Feel free to modify it.

I set fixed axis, so take that into consideration.
Lines x range can change from -5 to 5 and y range can change from -5 to 5 too