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Part II:
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The Java Library
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*/ import javaawt*; import javaawtevent*; import javaapplet*; public class ScrollbarDemo2 extends Applet { MyScrollbar myScrollbar; public void init() { myScrollbar = new MyScrollbar(ScrollbarHORIZONTAL, 0, 1, 0, 100); add(myScrollbar); } class MyScrollbar extends Scrollbar { public MyScrollbar(int style, int initial, int thumb, int min, int max) { super(style, initial, thumb, min, max); enableEvents(AWTEventADJUSTMENT_EVENT_MASK); } protected void processAdjustmentEvent(AdjustmentEvent ae) { showStatus("Adjustment event: " + aegetValue()); setValue(getValue()); superprocessAdjustmentEvent(ae); } } }
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Images
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his chapter examines the AWT s Image class and the javaawtimage package Together, they provide support for imaging (the display and manipulation of graphical images) An image is simply a rectangular graphical object Images are a key component of web design In fact, the inclusion of the <img> tag in the Mosaic browser at NCSA (National Center for Supercomputer Applications) is what caused the Web to begin to grow explosively in 1993 This tag was used to include an image inline with the flow of hypertext Java expands upon this basic concept, allowing images to be managed under program control Because of its importance, Java provides extensive support for imaging Images are objects of the Image class, which is part of the javaawt package Images are manipulated using the classes found in the javaawtimage package There are a large number of imaging classes and interfaces defined by javaawtimage, and it is not possible to examine them all Instead, we will focus on those that form the foundation of imaging Here are the javaawtimage classes discussed in this chapter:
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CropImageFilter FilteredImageSource ImageFilter MemoryImageSource PixelGrabber RGBImageFilter
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These are the interfaces that we will use:
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ImageConsumer ImageObserver ImageProducer
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Also examined is the MediaTracker class, which is part of javaawt
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File Formats
Originally, web images could only be in GIF format The GIF image format was created by CompuServe in 1987 to make it possible for images to be viewed while online, so it was well suited to the Internet GIF images can have only up to 256 colors each This limitation caused the major browser vendors to add support for JPEG images in 1995 The JPEG format was created by a group of photographic experts to store full-color-spectrum, continuous-tone
Part II:
The Java Library
images These images, when properly created, can be of much higher fidelity as well as more highly compressed than a GIF encoding of the same source image Another file format is PNG It too is an alternative to GIF In almost all cases, you will never care or notice which format is being used in your programs The Java image classes abstract the differences behind a clean interface
Image Fundamentals: Creating, Loading, and Displaying
There are three common operations that occur when you work with images: creating an image, loading an image, and displaying an image In Java, the Image class is used to refer to images in memory and to images that must be loaded from external sources Thus, Java provides ways for you to create a new image object and ways to load one It also provides a means by which an image can be displayed Let s look at each
Creating an Image Object
You might expect that you create a memory image using something like the following:
Image test = new Image(200, 100); // Error -- won't work
Not so Because images must eventually be painted on a window to be seen, the Image class doesn t have enough information about its environment to create the proper data format for the screen Therefore, the Component class in javaawt has a factory method called createImage( ) that is used to create Image objects (Remember that all of the AWT components are subclasses of Component, so all support this method) The createImage( ) method has the following two forms: Image createImage(ImageProducer imgProd) Image createImage(int width, int height) The first form returns an image produced by imgProd, which is an object of a class that implements the ImageProducer interface (We will look at image producers later) The second form returns a blank (that is, empty) image that has the specified width and height Here is an example:
Canvas c = new Canvas(); Image test = ccreateImage(200, 100);
This creates an instance of Canvas and then calls the createImage( ) method to actually make an Image object At this point, the image is blank Later you will see how to write data to it
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