Category Archive for: The Dynamic Billboard Applet

The Constructor

The Constructor The constructor for a Bill Data object simply initializes the URL and Image variables with the two parameters passed in. Initializing the pixel array is done in a separate method, because it is very processor intensive. This gives the applet a chance to only initialize the pixel array when it needs it. Bill Transition.java In previous…

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Bill Data.java

Bill Data.java The Bill Data class is mostly just a data structure for encapsulating attributes associated with individual billboards. It contains three variables. The first variable stores the URL to which the billboard is a link. The second variable has an Image that the applet uses to draw on the scr~ The third variable includes a pixel array of…

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mouse Released( )

mouse Released( ) When the mouse button is pressed with the cursor over the applet and then released” the mouse Released( ) method is called. The applet uses get Applet Context( ) showDocument( ) to send the browser to the URL that the current billboard points to. As Robert found out, sometimes browsers take a long time…

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mouse Moved and mouse Exitcd( )

mouse Moved and mouse Exitcd( ) mouse Moved and mouse Exitcd( )arc used change the text that )( H 5 on the status bar. When the 1l1ll11Sceursor is over the applet, the status bar is supposed to show the URL that the current billboard links to. So when mousclvlovedt ) gets called,the applet shows the URL on the…

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run( )

run( ) The run( ) method starts with a loop that waits for the first image to be fully loaded before proceeding. It then finishes the initialization of the applet by calling finish lnit. From there, it enters the main loop of the program. This main loop drives the transitions between billboards. Using the delay parameter passed in from…

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Unroll( )

Unroll( )  The Unroll ) method modifies the work pixels array for the next cell. It draws the roll onto the work pixels. This method first calculates the offset that it needs to use for drawing each-line of the roll. It then loops through each line of the roll, copying scan lines, from the new image onto the…

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parse Bill Data ()

parse Bill Data () This method creates and initializes the next billboard (Bill Data) object that the applet will use” It only gets called if the billboard object has not been created yet (the element corresponding to the next billboard object in the billboard array will be null). Normally, parse Bill Data() calls the-BillOata method int Pixels () after…

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Dynamic Billboard java

Dynamic Billboard java This is the main applet class. lt implements Runnable to include a thread-that’ controls the continuous process of creation and animation of the transitions. transition classes array stores the names of the transition classes as strings. It uses strings because it loads these classes dynamically using the method java.lang. ass for Name (String), This allows…

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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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