n Object Modelling in VB.NET

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'need to ensure that the enclosing rectangle 'includes the size and location of S MeX = MathMin(SX, MeX) MeY = MathMin(SY, MeY) Dim X1, Y1 As Integer X1 = MeX + MeWidth Y1 = MeY + MeHeight X1 = MathMax(X1, SX + SWidth) Y1 = MathMax(Y1, SY + SHeight) MeWidth = X1 MeX MeHeight = Y1 MeY End Sub Public Sub Remove(ByVal S As clsShape) Dim Item As clsShape For Each Item In mvarChildren If Item Is S Then mvarChildrenRemove(S) End If Next End Sub Public Function GetChild(ByVal Index As Integer) As clsShape If Index <= mvarShapesCount 1 Then Return mvarChildrenItem(Index) Else Return Nothing End If End Function Public Overrides Sub Draw(ByVal g As Graphics) Dim S As clsShape For Each S In mvarChildren SDraw(g) Next End Sub End Class Listing 1017: The Composite pattern added to the abstract Shape classes
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Since a CompositeShape is a shape by inheritance, we can add CompositeShape objects to a CompositeShape, which results in a very exible way of creating and manipulating complex assemblies of Shape objects We can create a composite shape by grouping other shape items together, or by deliberately assembling them in code (see Listing 1018)
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Public Function NewTriangle() As Shape Dim C As CompositeShape Dim L As Line C = New CompositeShape() L = New Line()
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LX = 500 LY = 0 LWidth = 500 LHeight = 1000 CAdd(L) L = New Line() LX = 0 LY = 1000 LWidth = 1000 LHeight = 0 CAdd(L) L = New Line() LX = 0 LY = 0 LWidth = 500 LHeight = 1000 CAdd(L) Return C End Function Listing 1018: Creating a CompositeShape
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Of course, the method shown above for creating a new triangle shape is not very useful, since it is not interactive However, by allowing multiple items to be selected and the selected items to be grouped, we could provide a way for user-de ned composite shapes to be built as the CAD program runs The Composite Pattern is used extensively in CAD, but is also a feature of many types of interactive software For example, multiple documents can be combined to form composite documents, and groups of database records can be formed so that a common operation can be performed on each member
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The set of structural patterns described by Gamma et al covers the range of possibilities for building exible software structures and maximizing the use of object-oriented programming principles Among these are:
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Bridge, that allows us to use a range of abstractions (eg abstract base classes) with a range of implementations (concrete classes) in such a way that a given concrete class can be appointed a different abstract class In effect, two separate class hierarchies are maintained: one for abstractions and another for concrete implementations By enclosing a member of the base implementation in the base abstraction, it becomes possible to make generalized changes to the abstract classes that proliferate throughout the implementation classes Decorator, that allows us to extend an object dynamically, by attaching a member of a helper class The Decorator pattern allows us to avoid sub-classing in the case where we wish to extend the functionality of speci c objects The example given in Gamma et al is the addition of Border and Scrollbar objects to a
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plain TextViewer By creating Border and Scrollbar as Decorator classes, we can avoid having to create a sub-class of the TextViewer class, and also have the ability to apply Decorator objects to other viewer classes Fa ade, which allows us to provide a single uniform interface to a complex set of interfaces For example, we might consider a Visual Basic form with added properties to access the data in controls as a Fa ade pattern Flyweight, which allows a large number of small items to share a single object An example of this is the use of Flyweight objects to represent any of a large number of characters in a word processor Each character has font, size, style, colour, etc attributes, but instead of occupying an object each, a single yweight object can act as the interface to a large number of characters Proxy, which is a way of making one object act as a surrogate for another to provide control access For example, we could use a proxy instead of dealing directly with a Printer object Since the Printer object may have to access the network and verify the on-line, etc status whenever it is accessed, the proxy could be used to maintain a copy of the printer status and allow us to control the printer Meanwhile, the proxy would only contact the real Printer object when it was necessary for printing
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