Adobe After Effects CS3 - Manual (Page 575)

AFTER EFFECTS CS3
User Guide
570
Argument type: index is a Number.
After Effects finds the mask by its index in the Timeline panel, starting at 1 and counting from the top.
Layer General attributes and methods
width Return type: Number.
Returns the width of the layer, in pixels. It is the same as source.width .
height Return type: Number.
Returns the height of the layer, in pixels. It is the same as source.height .
index Return type: Number.
Returns the index number of the layer in the composition.
parent Return type: Layer, Light, or Camera.
Returns the parent Layer object of the layer, if there is one. Example: position[0] + parent.width
hasParent Return type: Boolean.
Returns true if the layer has a parent or false if it doesn’t.
Use the hasParent attribute to determine if a layer has a parent. You can use this attribute even if there isn’t a parent
layer at present. For example, the following expression indicates that the layer to which you apply it will wiggle based
on the position of the layer’s parent. If the layer has no parent, then it will wiggle based on its own position. If the
layer is given a parent later, then the layer’s behavior will change accordingly:
idx = index;
if (hasParent) {
idx = parent.index;
}
thisComp.layer(idx).position.wiggle(5,20)
inPoint Return type: Number.
Returns the In point of the layer, in seconds.
Note: In general, the value of
outPoint is greater than the value of inPoint . However, if a layer is reversed in time, the
value of
inPoint
is greater than the value of
outPoint
. Similarly, the value of
startTime
can be greater than the value
of inPoint .
outPoint Return type: Number.
Returns the Out point of the layer, in seconds.
startTime Return type: Number.
Returns the start time of the layer, in seconds.
hasVideo Return type: Boolean.
Returns true if the layer has video, or false if it doesn’t.
hasAudio Return type: Boolean.
Returns true if the layer has audio or false if it doesn’t.
active Return type: Boolean.