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DisplayTransform subclass:#CompositeTransform
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instanceVariableNames:'globalTransform localTransform'
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Transformations'
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!
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CompositeTransform comment:'A composite transform provides the effect of several levels of coordinate transformations.'!
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!CompositeTransform methodsFor:'accessing'!
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inverseTransformation
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"Return the inverse transformation of the receiver"
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^self species new
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globalTransform: localTransform inverseTransformation
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localTransform: globalTransform inverseTransformation! !
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!CompositeTransform methodsFor:'converting'!
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asCompositeTransform
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^self!
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asMatrixTransform2x3
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^globalTransform asMatrixTransform2x3
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composedWithLocal: localTransform asMatrixTransform2x3! !
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!CompositeTransform methodsFor:'initialization'!
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globalTransform: gt localTransform: lt
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globalTransform _ gt.
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localTransform _ lt! !
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!CompositeTransform methodsFor:'testing'!
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isCompositeTransform
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^true!
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isIdentity
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^ globalTransform isIdentity and: [localTransform isIdentity]!
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isPureTranslation
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^ globalTransform isPureTranslation and: [localTransform isPureTranslation]! !
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!CompositeTransform methodsFor:'transformations'!
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invert: aPoint
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^ globalTransform invert: (localTransform invert: aPoint)!
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scale
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^ localTransform scale * globalTransform scale!
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transform: aPoint
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^ localTransform transform: (globalTransform transform: aPoint)! !
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!CompositeTransform methodsFor:'transforming points'!
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globalPointToLocal: aPoint
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"Transform aPoint from global coordinates into local coordinates"
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^localTransform globalPointToLocal:
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(globalTransform globalPointToLocal: aPoint)!
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localPointToGlobal: aPoint
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"Transform aPoint from global coordinates into local coordinates"
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^globalTransform localPointToGlobal:
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(localTransform localPointToGlobal: aPoint)! !
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!CompositeTransform class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/CompositeTransform.st,v 1.1 1999-10-06 22:23:08 cg Exp $'
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! !
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