Calculate distance between two x/y coordinates?

Question

I would like to calculate the distance between two x/y coordinates on the surface of a torus. So, this is a normal grid that has the property that its corners and sides are \'co

Answer 1

• If/while the distance between x coordinates is larger than half of the grid X size, add grid X size to the smaller x coordinate.
• Do the same for Y.
• Then calculate the distance.