Connection error
This check is manual and can be used for gross error searching by going traverse in the net. Start by clicking somewhere in the screen to form a square. By selecting point by point and then returning to the starting point, the connection error is calculated for the loop. This process gives a safe and quick check of the net, and you can quickly find any errors by using several different loops.
Undo delete of the last added point, restart by clearing memorized points.