Truncates edges of the sprite to the specified percentage. 1 == no truncation 0 == complete truncation.
The game object to work with
The left truncate value
The right truncate value
The top truncate value
The bottom truncate value
Work every frame so that you can change the truncates values without leaving the state
If you try to truncate left and right together OR top and bottom together, it will not work as expected. You can truncate only one side at a time.
Sprite Manager help here
(left, right, top and bottom are individual methods, but they are conveniently combined into one action)
Download the SM2 package here