Apple Shake 4 - Manual (Page 390)

390 Chapter 14 Customizing Shake
Offset Controls
In the startup macro file:
float xOffset = 0,
float yOffset = 0
This is similar to the Pan controls, but with center crosshairs. This control is available in
the Other–DropShadow node.
Rotate Controls
In the startup macro file:
float angle = 0,
float xCenter = width/2,
float yCenter = height/2,
This gives you a rotation dial and a center control. This example is plugged into a
Rotate function.