.
"
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.
"
Geometric subclass: #EllipticalArc
instanceVariableNames: 'boundingBox startAngle sweepAngle'
classVariableNames: ''
poolDictionaries: ''
category: 'Graphics-Geometry'
!
!EllipticalArc 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/libbasic2/EllipticalArc.st,v 1.3 1995-08-10 18:35:09 claus Exp $
"
!
documentation
"
This class implements an ellipse which is aligned to x and y axes
given a boundingBox, a startAngle and a sweepAngle.
Positive angles are taken clockwise, negative angles are counterclockwise.
"
! !
!EllipticalArc class methodsFor:'instance creation'!
boundingBox:aRectangle
"Return a new EllipticalArc."
^ self new boundingBox:aRectangle
!
boundingBox:aRectangle startAngle:startAngle sweepAngle:sweepAngle
"Return a new EllipticalArc."
^ self new boundingBox:aRectangle startAngle:startAngle sweepAngle:sweepAngle
!
center:centerPoint radius:radius
"Return a new Circle."
^ self new center:centerPoint radius:radius
! !
!EllipticalArc methodsFor:'converting'!
asEllipticalArc
^ self
! !
!EllipticalArc methodsFor:'queries'!
canBeFilled
^ true
! !
!EllipticalArc methodsFor:'displaying'!
displayStrokedOn:aGC
aGC displayArcX:boundingBox left
y:boundingBox top
width:boundingBox width
height:boundingBox height
from:startAngle
to:(startAngle+sweepAngle)
!
displayFilledOn:aGC
aGC fillArcX:boundingBox left
y:boundingBox top
width:boundingBox width
height:boundingBox height
from:startAngle
to:(startAngle+sweepAngle)
! !
!EllipticalArc methodsFor:'accessing'!
boundingBox:aRectangle startAngle:start sweepAngle:sweep
"set the center and radius"
boundingBox := aRectangle.
startAngle := start.
sweepAngle := sweep
!
boundingBox:aRectangle
"set the center and radius"
boundingBox := aRectangle.
startAngle := 0.
sweepAngle := 360
!
center:centerPoint radius:radiusNumber
"set the center and radius"
^ self boundingBox:((center-r) asPoint corner:(center+r) asPoint).
!
startAngle
"return the startAngle."
^ startAngle
!
sweepAngle
"return the sweepAngle."
^ sweepAngle
!
center
^ boundingBox center
! !