Keyboard Shortcuts:

c	Center the screen.
f	Toggle fullscreen display.
m	Toggle mouse coordinates display.
+	Zoom-in once.
-	Zoom-out once.
←	Pan left.
↑	Pan upward.
→	Pan right.
↓	Pan downward.
< or ,	Step backward in time.
> or .	Step forward in time.

Mouse Shortcuts:

Double-click	Zoom in.
Shift + Double-click	Zoom out.
Mouse-wheel up	Zoom in.
Mouse-wheel down	Zoom out.