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"
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COPYRIGHT (c) 1988 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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Array subclass:#Polygon
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Primitives'
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!
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Polygon comment:'
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Polygon - an array of points
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$Header: /cvs/stx/stx/libbasic2/Polygon.st,v 1.5 1994-01-09 21:22:50 claus Exp $
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'!
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!Polygon methodsFor: 'accessing'!
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top
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"return the top boundary of the polygon,
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that is the minimum y coordinate of all its points"
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|minY|
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(self size == 0) ifTrue: [^ nil].
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minY := (self at:1) y.
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self do:[:p |
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(p y < minY) ifTrue:[minY := p y].
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0 "stc hint"
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].
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^ minY
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!
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bottom
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"return the bottom boundary of the polygon,
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that is the maximum y coordinate of all its points"
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|maxY|
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(self size == 0) ifTrue: [^ nil].
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maxY := (self at:1) y.
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self do:[:p |
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(p y > maxY) ifTrue:[maxY := p y].
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0 "stc hint"
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0
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].
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^ maxY
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!
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left
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"return the left boundary of the polygon,
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that is the minimum x coordinate of all its points"
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|minX|
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(self size == 0) ifTrue: [^ nil].
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minX := (self at:1) x.
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self do:[:p |
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(p x < minX) ifTrue:[minX := p x].
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0 "stc hint"
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].
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^ minX
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!
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right
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"return the right boundary of the polygon,
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that is the maximum y coordinate of all its points"
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0
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|maxX|
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(self size == 0) ifTrue: [^ nil].
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maxX := (self at:1) x.
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self do:[:p |
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(p x > maxX) ifTrue:[maxX := p x].
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0 "stc hint"
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].
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^ maxX
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! !
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