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You create an instance of the Command class by using the Command class constructor within your J2ME application The Command class constructor requires three parameters These are the command label, the command type, and the command priority The Command class constructor returns an instance of the Command class The following example illustrates a cancel command The first parameter of the command declaration is Cancel Any text can be placed here and will appear on the screen as the label for the command The second parameter is the predefined command types Table 5-1 lists all the predefined command types The last parameter is the priority, which is set to 1 The command created by this declaration is assigned to cancel

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import javaapplet*; import javaawt*; import javaawtimage*; class Invert extends RGBImageFilter implements PlugInFilter { public Image filter(Applet a, Image in) { return acreateImage(new FilteredImageSource(ingetSource(), this)); } public int filterRGB(int x, int y, int rgb) { int r = 0xff - (rgb >> 16) & 0xff; int g = 0xff - (rgb >> 8) & 0xff; int b = 0xff - rgb & 0xff; return (0xff000000 | r << 16 | g << 8 | b); } }

Troubleshooting In Step 6, be sure to key the px after the numeric values The L moves the layer 272 pixels from the left of a browser window The T value moves the layer 290 pixels from the top of a browser window

FIGURE 25-8

cancel = new Command("Cancel", CommandCANCEL, 1);

25:

172 6

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The Contrast filter is very similar to Grayscale, except its override of filterRGB( ) is slightly more complicated The algorithm it uses for contrast enhancement takes the red, green, and blue values separately and boosts them by 12 times if they are already brighter than 128 If they are below 128, then they are divided by 12 The boosted values are properly clamped at 255 by the multclamp( ) method

BACK CANCEL EXIT HELP ITEM OK SCREEN STOP Table 5-1

import javaapplet*; import javaawt*; import javaawtimage*; public class Contrast extends RGBImageFilter implements PlugInFilter { public Image filter(Applet a, Image in) { return acreateImage(new FilteredImageSource(ingetSource(), this)); } private int multclamp(int in, double factor) { in = (int) (in * factor); return in > 255 255 : in; } double gain = 12; private int cont(int in) { return (in < 128) (int)(in/gain) : multclamp(in, gain); } public int filterRGB(int x, int y, int rgb) { int r = cont((rgb >> 16) & 0xff); int g = cont((rgb >> 8) & 0xff); int b = cont(rgb & 0xff); return (0xff000000 | r << 16 | g << 8 | b); } }

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8 In the Copy File As dialog box, click the Create New Folder icon Name the new folder images Double-click the images folder and then click the Save button to save the image file in this folder Under Category, click Title/Encoding In the Title box, key: Language Main Click OK to close the Page Properties dialog box 9 Choose File>Save as Template In the dialog box, key: Language_Main in the Save as box (see Figure 68)

The abstract class Convolver handles the basics of a convolution filter by implementing the ImageConsumer interface to move the source pixels into an array called imgpixels It also creates a second array called newimgpixels for the filtered data Convolution filters sample a small rectangle of pixels around each pixel in an image, called the convolution kernel This area, 3 3 pixels in this demo, is used to decide how to change the center pixel in the area

Move to the previous screen Cancel the current operation Terminate the application Display help information Map the command to an item on the screen Positive acknowledgment No direct key mapping available on device; command will be mapped to object on a form or canvas Stop the current operation

NOTE The reason that the filter can t modify the imgpixels array in place is that the next pixel on

10 Click Save Your screen should look like Figure 69 In the Document window, notice the file tab displays Language_Maindwt The file extension dwt stands for Dreamweaver Template

a scan line would try to use the original value for the previous pixel, which would have just been filtered away

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vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader

vb.net ean 13 reader