By R. J. Mitchell (auth.)

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It contains code which uses the graphics window module, GRWINDOW. The remaining modules, although written for the drawing package, contain general purpose facilities which can be used in other programs. They therefore are useful library modules. GRWINDOW, the graphics window module, contains the GWindow class for specifying areas of the screen within which such entities like lines, strings, circles and Bezier curves can be drawn, and text displayed. This is part of the window class hierarchy and so it uses the TWINDOW module, and is described in chapter 4.

As regards a particular item type, consider a Bezierltem. Drawing such a shape requires the calculation of the coordinates of points on the curve. This is achieved by using the Bezier class. Thus the particular GWindow which draws the curve needs to use a Bezier object. Similarly, a Bezier curve is in a window if all points on the curve are in the window. Thus another Bezier object is needed to calculate these points. Object-Oriented Design 23 A shape is a list of items. So that a shape can be drawn, or a test made to see if the shape is in a window, functions are needed for fmding each item of the shape.

As a car is a form of vehicle, but a car has a driver, a car class would inherit a vehicle class, but would be a client to a driver class. 5: a car is a vehicle, but it has a driver. 5 Inheritance or client relatioruhip Another way of determining the relationship is to consider if one class uses some of the facilities of another, but in a different manner. In the drawing package, both rectangles and lines require two sets of coordinates; both coordinates can be changed in the same manner, but the routine to draw each item is differenL Thus a rectangle can inherit a line.

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