"

 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.

"

Object subclass:#Geometric 

       instanceVariableNames:''

       classVariableNames:''

       poolDictionaries:''

       category:'Graphics-Geometry'

!

!Geometric 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

!

documentation

"

    Abstract superclass for geometric figures.

    Concrete classes are (currently) Rectangle, Polygon and the classes

    found in goodies/shape.

    These are not graphical objects, but pure mathematical ones.

    I.e. instances do not carry graphics attributes such as color, lineWidth etc.

    Use instances of (subclasses) of DisplayObject or (the soon to be 

    implemented GraphicsAttributesWrapper.

    Notice: ST/X does not use Geometric instances for drawing (yet).

    This class exists mainly to provide a superclass when ST-80 geometry classes are to be filed in.

"

! !

!Geometric methodsFor:'displaying'!

displayOn:aGC

    "display myself on a graphicsContext; the current graphics

     attributes are used. The default here is to display the outline."

    ^ self displayStrokedOn:aGC

!

displayStrokedOn:aGC

    "display my outline on a graphicsContext; the current graphics

     attributes are usedSince we do not know how to do it, nothing is

     drawn here."

"/ could be:

"/  ^ self subclassResponsibility

    ^ self

!

displayFilledOn:aGC

    "display myself filled on a graphicsContext; the current graphics

     attributes are used. Since we do not know how to do it, nothing is

     drawn here."

"/ could be:

"/  ^ self subclassResponsibility

    ^ self

! !