Archive for: September, 2014

Source Code Overview

Source Code Overview Robert designed the applet with a fast load time ill mind, He tries to keep the size of , the applet to a minimum so that there is less code to send cross the network He-also .attempts to delay some of the loading ‘and, initializing of the applet until, after the first image is displayed.…

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The Dynamic Billboard Applet

The Dynamic Billboard Applet Robert Temple is a software engineer at Starwave Corporation, where he has designed several of the most highly used applets in the world. His work includes the ESPNET SportsZone “Hit Charts” and “Batter vs. Pitcher” applets. The applet that impressed the folks at Starwave enough to ask him to join the company was _DynamrcBillboard, which…

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Scroll Panes

Scroll Panes A scroll pane is a component that presents a rectangular area in which a component may be viewed. Horizontal and/ or vertical scroll bars may be provided if necessary, Scroll panes are implemented in Swing by the j Scrofulous class, which extends J Compunction. Some of its constructors arc shown here: The following example illustrates…

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Loading an Image

Loading an Image The other way to obtain an image is to load one. To do this, use the getlmage( ) method defined by the Applet class. It has the following forms: Image getimage(URL 111:1) Image getimage Ikl, url, String image Name) The first version returns an Image object that encapsulates the image found at the…

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ImageObserver

ImageObserver ImageObserver is em interface used to receive notification as an image is being generated.lt:pageObs.ervcl’ defines only one method: imagcUpdate(). Using an image observer allows you t.o perform other actions; such as show a progress indicator or an attract screen” as ‘you arc informed of the progress of the download. This kind of notification isvery useful when an image…

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Tabbed Panes

Tabbed Panes A Tabbed”one is a component that appears as a group of folder sin a file cabinet. Each folder has a title. When a user selects ‘a folder, its contents become visible. Only one of the folders may be selected at a time. Tabbed panes arc commonly used for setting configuration options. Tabbed panes are encapsulated b…

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Image Observer Example

Image Observer Example Now let’s look at a practical example that overrides image Update( ) to make a version I” of the Simple Image Load applet that doesn’t flicker as much. The default implementation of image Update( ) in Applet has.several problems. First, it repaints the entire image each time any new data arrives. This causes flashing between…

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Double Buffering

Double Buffering Not only are images useful for storing pictures, as we’ve just shown, but you can. also use them as offscreen drawing surfaces. This allows you to render any image including ‘text and graphics, to an. offscreen buffer that you can display at a later time. The advantage to doing this is that the image is seen…

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Media Tracker

Media Tracker Many early Java developers found the Imageobserver interface far too difficult to understand and manage when there were multiple eLhage to be loaded. The developer community-asked for q simpler solution that would allow programmers to load all of their images synchronously, without having to worry about Image Tlpd Atct ). In response to this, Sun Micro systems…

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lmage Filter

image Filter  Given the ImagcProduccr and Imageconsumer interface pair-and their concrete classes McmorylmageSourcc and PixelGrabber-you can create an ‘arbitrary set of translation filters that takes a source of pixels, modifies them, ami passes them on to an arbitrary consumer. This mechanism is analogous to the way concrete classes arc created from the abstract l~$.classes InputStream, OutputStream, Reader, and Writer is stream…

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