The following expressions are common to several plugins.
Angle
Angle
The object's current angle, in degrees. 0 degrees is facing right and angles increment clockwise.
Appearance
Opacity
The object's current opacity (semitransparency), from 0 (transparent) to 100 (opaque).
Misc
AsJSON
Save the object state to a string of data in JSON format, and return it. This can be downloaded or otherwise stored, and later the state of the object restored using the Set from JSON action.
Count
The number of instances of the object type.
PickedCount
The number of instances meeting the event's conditions. For example, if the event has the condition "Mouse is over Sprite", Sprite.PickedCount will return the number of Sprite instances that the mouse is over.
IID
Return the instance's index ID (IID). See instances.
UID
Return the instance's unique ID (UID). See instances.
Size & Position
BBoxLeft
BBoxRight
BBoxTop
BBoxBottom
Return the layout co-ordinates of the object's axis-aligned bounding box. This is the smallest unrotated box that completely encloses the object, taking in to account any rotation or stretching.
Width
Height
Return the size of the object in pixels.
ImagePointX(nameOrNumber)
ImagePointY(nameOrNumber)
Return the position of one of the object's image points from its currently displaying animation frame in layout co-ordinates. Either the image point's name or its number can be passed.
X
Y
Return the object's position in the layout, in pixels. The origin (0,0) is at the top-left of the layout and the Y axis increments downwards.
Time
dt
Return delta-time according to the object's own timescale. See Delta-time and framerate independence for more information.
Z Order
LayerName
The name of the layer the instance is currently on.
LayerNumber
The zero-based index of the layer the instance is currently on.
ZIndex
Get the zero-based index of the Z order of this instance within its current layer. 0 is the bottom instance, increasing up to the top instance.