abstract fun next(ox: Double, oy: Double, nx: Double, ny: Double): P
This method must calculate the RELATIVE next allowed position given the current position and the position in which the node wants to move. For example, if your node is in position [2,3], wants to move to [3,4] but the next allowed position (because, e.g., of physical obstacles) is [2.5,3.5], the result must be a Position containing coordinates [0.5,0.5], so it's the relative movement considering the starting position as origin.
ox - Double: The current X position
oy - Double: The current Y position
nx - Double: The requested X position
ny - Double: The requested Y position
Return
P: the next allowed position, where the node can actually move. This position MUST be considered as a vector whose start point is in [ox, oy].