"

 COPYRIGHT (c) 1988/89/90 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.

"

Array subclass:#Polygon

       instanceVariableNames:''

       classVariableNames:''

       poolDictionaries:''

       category:'Graphics-Primitives'

!

Polygon comment:'

 Polygon - an array of points

'!

!Polygon methodsFor: 'accessing'!

top

    |minY|

    (self size == 0) ifTrue: [^ nil].

    minY := (self at:1) y.

    self do:[:p |

	(p y < minY) ifTrue:[minY := p y].

	0 "stc hint"

    ].

    ^ minY

!

bottom

    |maxY|

    (self size == 0) ifTrue: [^ nil].

    maxY := (self at:1) y.

    self do:[:p |

	(p y > maxY) ifTrue:[maxY := p y].

	0 "stc hint"

    ].

    ^ maxY

!

left

    |minX|

    (self size == 0) ifTrue: [^ nil].

    minX := (self at:1) x.

    self do:[:p |

	(p x < minX) ifTrue:[minX := p x].

	0 "stc hint"

    ].

    ^ minX

!

right

    |maxX|

    (self size == 0) ifTrue: [^ nil].

    maxX := (self at:1) x.

    self do:[:p |

	(p x > maxX) ifTrue:[maxX := p x].

	0 "stc hint"

    ].

    ^ maxX

! !