"
 COPYRIGHT (c) 1995 by Claus Gittinger
              All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"

LayoutOrigin subclass:#AlignmentOrigin
	 instanceVariableNames:'leftAlignmentFraction topAlignmentFraction'
	 classVariableNames:''
	 poolDictionaries:''
	 category:'Graphics-Geometry'
!

!AlignmentOrigin class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 1995 by Claus Gittinger
              All Rights Reserved

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.
"
!

version
"
$Header: /cvs/stx/stx/libview2/Attic/AlignOrg.st,v 1.2 1995-08-10 18:43:06 claus Exp $
"
! !

!AlignmentOrigin methodsFor:'accessing'!

leftAlignmentFraction:something
    "set leftAlignmentFraction"

    leftAlignmentFraction := something.
!

leftAlignmentFraction
    "return leftAlignmentFraction"

    ^ leftAlignmentFraction
!

topAlignmentFraction:something
    "set topAlignmentFraction"

    topAlignmentFraction := something.
!

topAlignmentFraction
    "return topAlignmentFraction"

    ^ topFraction
! !

!AlignmentOrigin methodsFor:'printing & storing'!

displayString
    ^ 'LayoutOrigin(' 
	, 'l: ' , leftFraction displayString
	, '+' , leftOffset displayString
	, ' t: ' , topFraction displayString
	, '+' , topOffset displayString
	, ' a: ' , leftAlignmentFraction displayString
	, '@' , topAlignmentFraction displayString
	, ')'
! !


!AlignmentOrigin methodsFor:'queries'!

rectangleRelativeTo:superRectangle preferred:prefRect
    |x y|

    leftOffset isNil ifTrue:[
	x := 0
    ] ifFalse:[
	x := leftOffset
    ].
    topOffset isNil ifTrue:[
	y := 0
    ] ifFalse:[
	y := topOffset
    ].
    leftFraction notNil ifTrue:[
	x := x + (superRectangle width * leftFraction)
    ].
    topFraction notNil ifTrue:[
	y := y + (superRectangle height * topFraction)
    ].
    leftAlignmentFraction ~~ 0 ifTrue:[
	x := x - (prefRect width * leftAlignmentFraction)
    ].
    topAlignmentFraction ~~ 0 ifTrue:[
	y := y - (prefRect height * topAlignmentFraction)
    ].
    ^ Rectangle origin:x@y extent:prefRect extent

    "
     |superRect aO|

     superRect := 0@0 corner:100@100.
     aO := (AlignmentOrigin new).
     aO leftFraction:0.5;
	topFraction:0.5;
	leftAlignmentFraction:0.5;
	topAlignmentFraction:0.5.
     aO rectangleRelativeTo:superRect preferred:(0@0 corner:30@30) 
    "
! !

!AlignmentOrigin methodsFor:'initialization'!

initialize
    super initialize.
    leftAlignmentFraction := topAlignmentFraction := 0.
! !