M:	Show/Hide Menu
C:	Switch colour
S:	Show visits
F1:	Reset Scale / Pan
Mouse wheel / drag:	Scale / Pan
Multipier:	/   -   +   *
Modulus:	/   -   +   *
+- amount
*/ amount
F(x1,x0,mul,mod): Javascript	Set F()
Shape:	Circle 3 4 5 6
Flip half:
Alpha:	0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0