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Animation Functions
Function Reference
Simple Mathematical Functions
Slip Functions
Use the following functions to slip the starting
frame of a clip backwards or forwards using the slip channel. In
effect, the displayed frame in a layer's clip will be the animation's
current frame number plus the slip value. For example, a slip value
of -15 holds the clip at the first frame and repeats it 15 times before
the clip begins. In this way, you can create a freeze frame effect
with one layer while animating another layer. A slip value of 10
begins the clip at frame 11. See
Modifying Surfaces.
pingpong
Returns
a slip value that makes a clip continuously cycle forwards and backwards.
The result should usually be assigned to the slip channel of a layer.
Syntax: |
pingpong(length) |
Arguments: |
- length
is the number of frames to display before starting to play backwards.
This is usually the length of the original clip.
|
Examples: |
- pingpong(10)
returns a slip value that makes a clip continuously play in a forward
and backward cycle from frame 1 to frame 10.
- pingpong(30)
yields the following curve:
|
repeat
Returns
a slip value that makes a clip continuously repeat forwards. The result
should usually be assigned to the slip channel of a layer.
Syntax: |
repeat(length) |
Arguments: |
- length
is the number of frames to display before repeating from the beginning.
This is usually the length of the original clip.
|
Examples: |
- repeat(10)
returns a slip value that makes a clip repeat forwards from frame
1 to frame 10.
- repeat(30)
yields the following curve:
|
repeatback
Returns
a slip value that makes a clip continuously repeat backwards. The result
should usually be assigned to the slip channel of a layer.
Syntax: |
repeatback(length) |
Arguments: |
- length
is the number of frames from the beginning to display backwards
before repeating. This is usually the length of the original clip.
|
Examples: |
- repeatback(10)
returns a slip value that makes a clip repeat backwards from frame
10 to frame 1.
- repeatback(30)
yields the following curve:
|
frametoslip
Returns
a slip value that makes a clip display at a given timebar frame.
If the given frame number is constant, the resulting clips will
freeze at that frame. The result should usually be assigned to the
slip channel of a layer.
Syntax: |
frametoslip(TimebarFrame) |
Arguments: |
- TimebarFrame
is the timebar frame at which to display the clip.
|
Examples: |
- frametoslip(10)
returns a slip value that makes a clip freeze at frame 10.
- frametoslip(frame
/ 2) returns a slip value that makes a clisplay at half the normal
speed.
- frametoslip(14)
yields the following curve:
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