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Listing 7-5 shows how to write a MIDlet that draws a line on the canvas based on pointer events generated by the user of the application Listing 7-6 is the JAD file for Listing 7-5 Each time a pointer event occurs, the MIDlet redraws the line as determined by the coordinate passed to the appropriate pointer event method Listing 7-5 follows the same basic structure as other listings discussed previously in this chapter The PointerExample class definition is technically the same as the GameActionExample class definition in Listing 7-3, except the class name is different Therefore, we ll jump down to the definition of the MyCanvas class Several variables are declared at the beginning of the MyCanvas class Two variables are used to reference commands These are the Exit command used by the user to terminate the MIDlet and the Erase command The Erase command is used whenever the user wants to remove the line from the screen Next, a boolean variable called eraseFlag is declared and is initialized to a false value The eraseFlag is used throughout the MIDlet to indicate whether the user wants the screen erased There are also four integers declared These integers are used to hold the start and current coordinates when the line is being drawn And the last variable is reference to the instance of the PointerExample class The MyCanvas class constructor definition assigns commands to references and associates commands and the CommandListener with the instance of the Canvas class This is the same technique illustrated in other listings in this chapter You ll notice that the paint() method is a bit more complex than paint() methods defined in other listings in this chapter because the paint() method must perform several tasks First, the paint() method must determine whether the user wants the screen erased by evaluating the value of the eraseFlag If the eraseFlag is true, images on the canvas are erased, otherwise the paint() method draws the line on the canvas The canvas is erased by calling the setColor() method to white Remember from our previous discussion about the setColor() method that you must pass the setColor() method three parameters These are color values for red, green, and blue The higher the color value, the brighter the color The highest and therefore brightest color value is 255, which is white The fillRect() method is then called to paint a rectangle on the canvas with the current color, which is white The fillRect() method requires four parameters The first two parameters are the coordinates of the upper-left corner and lower-right corner of the rectangle The upper-left corner of the rectangle is the first cell of the canvas The lowerright corner is determined by the getWidth() and getHeight() methods, both of which return the maximum width and height of the filled rectangle You ll be formally introduced to the setColor() method, the fillRect() method, and other graphic methods in the next section of this chapter Once the canvas is erased, the eraseFlag, start, and current coordinates are initialized to false and zero, respectively The paint() method is then abruptly terminated with the return statement because the remaining statements in the paint() method draw a line. vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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NET. Free demo download. How to read, scan EAN - 13 linear barcode image in . NET applications ... High-quality barcode reader ; C#, VB . NET sample code ... The Web designer provides visual direction for the Web site (see Figure 114) Based on the site s goals and content, the Web designer selects a color palette, gives shape and definition to each page, and provides a consistent look to the site The Web designer then makes sketches or creates storyboards for the site After the team has approved the prototypes, the Web designer: creates the graphics, including navigation buttons, animations, interface layout, and charts creates or obtains photographs, maps, and other visuals to enhance the site on the screen, which is not what the user requested However, if the user didn t select the Erase command, statements that erase the canvas within the paint() method are skipped, and the MIDlet proceeds to draw a line on the screen This process begins by calling the setColor() method and setting each parameter to zero Zero is the darkest color value, which is black This means images drawn on the canvas after the color is set to zero are drawn in black The drawLine() method is called once the color is set to black The drawLine() method requires four parameters The first two parameters identify the starting coordinates for the line, and the other parameters identify the end coordinates of the line The values of these parameters are the current values of sX, sY, cX, cY variables The DownloadsTableModel class houses the Download Manager s list of downloads and is the backing data source for the GUI s Downloads JTable instance The DownloadsTableModel class is shown here Notice that it extends AbstractTableModel and implements the Observer interface: import javautil*; import javaxswing*; import javaxswingtable*; // This class manages the download table's data class DownloadsTableModel extends AbstractTableModel implements Observer { 9 Listed here are the steps for detecting and processing pointer events: 1 Declare references to classes 33: vb.net ean 13 reader VB . NET Image: VB Code to Read and Recognize EAN - 13 Barcode from ...
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