"

 COPYRIGHT (c) 1996 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:#LineSegment

	instanceVariableNames:'startPoint endPoint'

	classVariableNames:''

	poolDictionaries:''

	category:'Graphics-Geometry'

!

!LineSegment class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1996 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.

"

!

documentation

"

    LineSegments represent a line consisting of start and endPoint

    (actually, its a vector, since the direction makes a difference when

     instances are compared using #=).

    [author:]

        Claus Gittinger

    [see also:]

        Rectangle Polygon EllipticalArc Circle Spline Curve Point

        GraphicsContext

"

! !

!LineSegment class methodsFor:'instance creation'!

from:start to:end

    "return a new lineSegment."

    ^ self new start:start end:end

    "Created: 8.5.1996 / 20:40:13 / cg"

!

with:p1 with:p2

    "return a new lineSegment; the smaller point is taken as startPoint."

    p1 < p2 ifTrue:[

        self new start:p1 end:p2

    ].

    ^ self new start:p2 end:p1

    "Created: 8.5.1996 / 20:41:03 / cg"

! !

!LineSegment methodsFor:'accessing'!

end

    "return the endPoint"

    ^ endPoint

    "Created: 8.5.1996 / 20:41:43 / cg"

!

end:aPoint

    "set the endPoint"

    endPoint := aPoint

    "Created: 8.5.1996 / 20:41:54 / cg"

!

start

    "return the startPoint"

    ^ startPoint

    "Created: 8.5.1996 / 20:41:35 / cg"

!

start:aPoint

    "set the startPoint"

    startPoint := aPoint

    "Created: 8.5.1996 / 20:42:07 / cg"

!

start:p1 end:p2

    "set both the startPoint and the endPoint"

    startPoint := p1.

    endPoint := p2.

    "Created: 8.5.1996 / 20:48:32 / cg"

! !

!LineSegment methodsFor:'converting'!

asPointArray

    "return an array containing my points."

    ^ Array with:startPoint with:endPoint

    "Created: 8.5.1996 / 20:46:08 / cg"

! !

!LineSegment methodsFor:'displaying'!

displayFilledOn:aGC

    "raise an error - a lineSegment cannot be drawn filled"

    self shouldNotImplement

    "Created: 8.5.1996 / 21:04:27 / cg"

!

displayStrokedOn:aGC

    "display the receiver in the graphicsContext, aGC"

    aGC displayLineFrom:startPoint to:endPoint

    "

     |v|

     v := View new openAndWait.

     (LineSegment from:10@10 to:50@50) displayStrokedOn:v

    "

    "Modified: 8.5.1996 / 14:40:53 / cg"

    "Created: 8.5.1996 / 21:05:16 / cg"

! !

!LineSegment methodsFor:'queries'!

bounds

    "return the smallest enclosing rectangle"

    |minX maxX minY maxY|

    minX := startPoint x min:endPoint x.

    maxX := startPoint x max:endPoint x.

    minY := startPoint y min:endPoint y.

    maxY := startPoint y max:endPoint y.

    ^ Rectangle left:minX right:maxX top:minY bottom:maxY

    "

     (LineSegment from:(10@10) to:(90@90)) bounds 

    "

    "Modified: 8.5.1996 / 20:50:03 / cg"

! !

!LineSegment class methodsFor:'documentation'!

version

! !