'From Pharo1.2.1 of 2 April 2011 [Latest update: #12345] on 6 August 2011 at 2:20:37 pm'!

!JPPlayer methodsFor: 'private' stamp: 'EiichiroIto 8/6/2011 14:20'!
processKeys
	| key position |
	key := owner key.
	position := self center.
	(key anyMask: 1)
		ifTrue: [ position := -4 @ 0 + position ].
	(key anyMask: 2)
		ifTrue: [ position := 4 @ 0 + position ].
	(key anyMask: 4)
		ifTrue: [ position := 0 @ 4 + position ].
	(key anyMask: 8)
		ifTrue: [ position := 0 @ -4 + position ].
	self center: position! !