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# $Id: compositeExample.xotcl,v 1.1 2004/05/23 22:50:39 neumann Exp $
# include the pattern
source composite.xotcl
Class Graphic
@ @File {
description {
Simple Graphics example of the composite pattern taken from the paper
'Filters as a Language Support for Design Patterns in
Object-Oriented Scripting Languages'. They demonstrate instfilters,
filter chains and filter inheritance.
}
}
Graphic instproc draw {} {
puts "in--- draw SELF: [self] CLASS: [self class]"
}
Composite Picture -superclass Graphic
Class Line -superclass Graphic
Class Rectangle -superclass Graphic
Picture addOperations draw
#Picture removeOperations draw
Picture aPicture
Picture aPicture::bPicture
Line aPicture::aLine
Rectangle aPicture::aRect
Line aPicture::bPicture::aLine
Rectangle aPicture::bPicture::aRect
Picture aPicture::bPicture::cPicture
Picture aPicture::bPicture::dPicture
Line aPicture::bPicture::cPicture::cLine
# draw eines Composites
puts "DRAW im Composite: aPicture"
aPicture draw
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