Adobe After Effects - Manual (Page 693)

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width
height
index
parent
hasParent
inPoint
Note:
outPoint
startTime
hasVideo
hasAudio
active
enabled
audioActive
sampleImage(point, radius = [.5, .5], postEffect=true, t=time)
Layer General attributes and methods (expression reference)
Return type: Number.
Returns the width of the layer, in pixels. It is the same as source.width.
Return type: Number.
Returns the height of the layer, in pixels. It is the same as source.height.
Return type: Number.
Returns the index number of the layer in the composition.
Return type: Layer, Light, or Camera.
Returns the parent Layer object of the layer, if it has one. Example: position[0] + parent.width
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 layer. You can use this attribute even if the layer has no parent layer at present.
For example, the following expression indicates that the layer to which you apply it wiggles based on the position of the parent. If the layer has no
parent, then it wiggles based on its own position. If the layer is given a parent later, then the behavior of the layer changes accordingly:
idx = index; if (hasParent) { idx = parent.index; } thisComp.layer(idx).position.wiggle(5,20)
Return type: Number.
Returns the In point of the layer, in seconds.
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.
Return type: Number.
Returns the Out point of the layer, in seconds.
Return type: Number.
Returns the start time of the layer, in seconds.
Return type: Boolean.
Returns true if the layer has video, or false if it doesn’t.
Return type: Boolean.
Returns true if the layer has audio or false if it doesn’t.
Return type: Boolean.
Returns true if the Video switch is on for the layer and the current time is in the range from the In point of the layer to the Out point of the layer;
false otherwise.
Return type: Boolean.
Returns true if the Video switch is on for the layer; false otherwise.
Return type: Boolean.
Returns true if the Audio switch is on for the layer and the current time is in the range from the In point of the layer to the Out point of the layer;
false otherwise.
Return type: Array [4].
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