The Ren'Py Reference Manual: (offline | online)

MoveTransition

Example

init:
    $ move = MoveTransition(0.5)

e "The move transition moves around images that have
   changed position."

e "For example..."

show eileen happy at offscreenleft with move

e "I can move over to the offscreenleft position, just off
   the left side of the screen."

show eileen happy at left with move

e "The left position has my left side border the left
   margin of the screen."

show eileen happy at center with move

e "I can also move to the center..."

show eileen happy at right with move

e "... the right ..."

show eileen happy at offscreenright with move

e "... or even to offscreenright, off the right-hand side
   of the screen."

show eileen happy at right with move

e "We don't limit you to these five positions either. You
   can always create your own Position objects."
The Ren'Py Reference Manual: (offline | online)