Apple Final Cut Pro 6 - Manual (Page 1096)

Chapter 15 Adjusting Parameters for Keyframed Effects 311
II
To change the angle between one side of a Bezier curve and the other:
m Hold down the Command key as you drag a Bezier handle.
When you release the Command key, the new relative angle of the two handles is
locked to the angle you set.
To change the length and the angle of one Bezier handle independently
of the other:
m Hold down the Command and Shift keys as you drag a Bezier handle.
When you release both keys, the new relative angle and length of the two handles
are locked.
Creating Keyframed Motion Paths in the Canvas
You can create motion for a clip by repositioning it and then setting keyframes to
change the clip’s Center parameter value over time. By setting enough keyframes, you
can eventually create the motion path you want.
There is an easier way, however, which can produce more sophisticated results; you set
up the motion in the Canvas using a motion path (in Image+Wireframe or Wireframe
mode). Once you set the first Center parameter keyframe for a clip in its Motion tab, all
subsequent changes made to that clip at different points in time introduce additional
center keyframes. When you create two or more center keyframes, they appear in the
Canvas along a line called the motion path.
Hold down the
Command key to change
the angle of a handle
independently of the
other handle.
Hold down the
Command and Shift keys
to change the length and
angle of a handle
independently of the
other handle.