Continuity at the junction between successive cubic bezier splines is enforced.

'Q' turns the control polygon off / 'W' turns the control polygon on

'E' turns the control points off / 'R' turns the control points on

'I' increases the point sizes / 'O' decreases the point sizes

'N' increases permissiveness of clicking a point / 'O' decreases (within how many pixels must you be)

'J' increases the fine rendering of curves by a factor of 2 / 'K' decreases it

'Z' will dump your current picture to the java console in a form which can be copied and pasted into the header of a7.java to be a new starting pic