JavaFX Script Classes in Java

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11 JavaFX Script Classes
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* The fill paint for this shape, if it has one */ public var fillPaint:Paint; /** * Returns whether this shape should be filled * @return true to fill the shape */ public function shouldFill():Boolean { return fillPaint != null; } /** * Gets the area of the shape * @return the area of the shape */ public abstract bound function getArea():Number; /** * Gets the bounds of the shape * @return the bounds of the shape */ public abstract bound function getBounds():Rectangle2D; /** * Returns whether this shape contains a given point * @param point a point * @return true if the given point lies within the shape */ public abstract bound function con tains(point:Point2D):Boolean; public override function toString():String { "Stroke: {strokePaint}, fill: {fillPaint}" } }
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ExampleShape is an abstract class, which is indicated by the abstract modifier on line 11 It is logical for this class to be abstract because you would never expect to instantiate something that is just a shape instead, you would create instances of concrete shapes such as rectangles, circles, lines, and so on In this case, we are also required to make the class abstract because it declares three abstract functions on lines 34, 40, and 47An abstract class is, however, not absolutely required to contain any abstract functions As in Java, an abstract function declaration defines the signature of a function that all concrete subclasses must implementThe getArea(), getBounds(), and contains() functions will be implemented in different ways by the various shape-specific subclasses, as you ll see in the next sectionThe important point is that the abstract function declara-
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Subclassing and Abstract Classes
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tion guarantees to application code that these functions will be provided, with the given signature, by any shape All three of the abstract functions in this class are bound, for a reason that we ll discuss later This class also declares two instance variables, both of type javafxscenepaintPaint As you ll see later in this book, a Paint defines the color or colors used to draw or fill a shape or some text In the simplest case, a Paint is a solid color, such as ColorBLACK, that causes all the pixels it affects to have the same colorA Paint can also be a gradient or any other distribution of colors In this case, the variable strokePaint is intended to be the color used to draw the outline of the shape, defaulted to black on line 15, while fillPaint is the color used to optionally fill its interior By default, fillPaint is null, which is meant to indicate that the shape should not be filledThe concrete function shouldFill() declared on lines 26 to 28 can be used to determine whether filling is required
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Extending the Base Class
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With the base class in place, we can now create subclasses that represent concrete shapes Each different shape will have its own instance variables that define its outline and will also implement the three abstract methods required by the base class definition Listing 11-3 shows the implementation of a subclass that represents a rectangle with its sides parallel to the coordinate axes
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Listing 11-3
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A JavaFX Implementation of a Rectangular Shape
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package javafxclasses; import javafxgeometryPoint2D; import javafxgeometryRectangle2D; public class ExampleRectangle extends ExampleShape, Cloneable { public var x:Number; public var y:Number; public var width:Number; public var height:Number; public override bound function getArea():Number { width * height; } public override bound function getBounds():Rectangle2D { Rectangle2D { minX: x minY: y width: width height: height } }
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