#1 Drawing graphs.

We have a list of points in a 2D space.

In the code, it is not a list but a array, the DataPoint Net[] array in a object of the DataPointNetwork class.

And each point has a set of arrows that it likes (in some sense, arrows that point to other points it would like to emulate).

In the code, the set of arrows is the ArrayList of DataPointConnection objects, with EndPoint being the sharp point of the arrow.

We need some code to draw this on the screen.