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"
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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Geometric subclass: #EllipticalArc
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instanceVariableNames: 'boundingBox startAngle sweepAngle'
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classVariableNames: ''
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poolDictionaries: ''
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category: 'Graphics-Geometry'
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!
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!EllipticalArc class methodsFor: 'documentation'!
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copyright
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"
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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version
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$Header: /cvs/stx/stx/libbasic2/EllipticalArc.st,v 1.1 1995-06-06 04:01:53 claus Exp $
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"
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!
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documentation
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"
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This class implements an ellipse which is aligned to x and y axes
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given a boundingBox, a startAngle and a sweepAngle.
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Positive angles are taken clockwise, negative angles are counterclockwise.
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"
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! !
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!EllipticalArc class methodsFor:'instance creation'!
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boundingBox:aRectangle
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"Return a new EllipticalArc."
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^ self new boundingBox:aRectangle
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!
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boundingBox:aRectangle startAngle:startAngle sweepAngle:sweepAngle
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"Return a new EllipticalArc."
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^ self new boundingBox:aRectangle startAngle:startAngle sweepAngle:sweepAngle
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!
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center:centerPoint radius:radius
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"Return a new Circle."
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^ self new center:centerPoint radius:radius
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! !
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!EllipticalArc methodsFor:'converting'!
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asEllipticalArc
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^ self
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! !
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!EllipticalArc methodsFor:'queries'!
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canBeFilled
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^ true
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! !
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!EllipticalArc methodsFor:'displaying'!
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displayStrokedOn:aGC
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aGC displayArcX:boundingBox left
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y:boundingBox top
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width:boundingBox width
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height:boundingBox height
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from:startAngle
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to:(startAngle+sweepAngle)
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!
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displayFilledOn:aGC
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aGC fillArcX:boundingBox left
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y:boundingBox top
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width:boundingBox width
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height:boundingBox height
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from:startAngle
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to:(startAngle+sweepAngle)
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! !
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!EllipticalArc methodsFor:'accessing'!
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boundingBox:aRectangle startAngle:start sweepAngle:sweep
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"set the center and radius"
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boundingBox := aRectangle.
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startAngle := start.
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sweepAngle := sweep
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!
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boundingBox:aRectangle
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"set the center and radius"
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boundingBox := aRectangle.
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startAngle := 0.
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sweepAngle := 360
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!
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center:centerPoint radius:radiusNumber
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"set the center and radius"
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^ self boundingBox:((center-r) asPoint corner:(center+r) asPoint).
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!
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startAngle
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"return the startAngle."
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^ startAngle
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sweepAngle
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"return the sweepAngle."
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^ sweepAngle
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center
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^ boundingBox center
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! !
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