Keyframe-Looping Methods; The Active And Enabled Attributes; To Animate With The Propertygroup Method And Propertyindex Attribute - Adobe AFTER EFFECTS 7.0 Manual

Keyframe-looping methods

You can use keyframe-looping methods to repeat a series of keyframes. You can use these methods on any property
except marker. Keyframes or duration values that are too large are clipped to the maximum allowable value. Values
that are too small result in a constant loop.
The default argument for keyframe-looping methods is
can substitute with any of the following arguments:
c ycle
Repeats the specified segment, but alternates between repeating forward and backward in the segment.
pingpong
Repeats the specified segment, but offsets each cycle by the difference in the value of the property at the start
offset
and end of the segment, multiplied by the number of times the segment has looped.
Does not repeat the specified segment, but continues to animate a property based on the velocity at the
continue
first or last keyframe. For example, if the last keyframe of a layer's Scale property is 100%, the layer continues to scale
from 100% to the Out point, instead of looping directly back to the Out point. This type does not accept a keyframes
or duration argument.

The active and enabled attributes

You can use the attribute in an expression to return a Boolean value that reports the status of a layer, camera,
ac t ive
property, property group, or effect.
The attribute has the following behaviors:
ac t ive
•
When reporting on a layer,
layer's In and Out points.
•
When reporting on an effect,
•
When reporting on a camera,
time.
•
When reporting on any other property group or property,
The attribute returns a Boolean value that reports whether a property or layer is enabled based on the Video
enable d
switch or effect switch

To animate with the propertyGroup method and propertyIndex attribute

Values of propertyGroup relative to the brush stroke's Position property
A. propertyGroup(4) B. propertyGroup(3) C. propertyGroup(2) D. propertyGroup(1) E. Position's propertyIndex value is 2; Rotation's
propertyIndex value is 4.
The example below uses the
is true if the Video switch
ac t ive
is true if the effect is turned on and the layer effect switch
ac t ive
is true if the camera is the Active Camera for the composition at the current
ac t ive
in the Timeline panel.
A
B
C
D
E
method and
prop er t yGroup
, which repeats the specified segment. However, you
c ycle
is selected and the current time is between the
is true if the property is enabled.
ac t ive
attribute to create swirling paint strokes.
prop er t y Index
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is selected.