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Some image types, such as GIF and PNG, support transparency; others, such as JPEG, don t. Figure 10.9 shows a JPEG image in the background. Three other images Figure 10.8 Different frames were added on top of it. taken from an animated GIF The circle with the letter i is a PNG that is partly transparent. When you add this file to a document, the transparency of the original image is preserved. The other two images are GIFs that aren t transparent. If you open them in another application, you ll see that they are completely opaque.

To return to the bookmarked location, open the Bookmark dialog box from the Insert menu. Highlight the name of the bookmark and then click Go To. Bookmarks are not visible in the finished document. However, if you do want to delete bookmarks, you can do so by highlighting them in the Bookmark dialog box and clicking Delete.

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Running the Servlet from a browser first allows the Servlet to be tested independent of the J2ME client we will be creating in order to make certain it is working properly. This way, if there are problems running the EnterpriseClient, odds are that it is the client that is causing the problems rather than the Servlet. Note, however, that the POST functionality is not tested at this point. Creating the client The MIDP client application that we create will access our EnterpriseServletExample using an HTTP connection. How the connection is obtained differs depending on whether we are doing a GET or a POST. If the request is to be of the method type GET, parameters are included as part of the connection URL provided to the Connection.open() method. HTTP GET parameters are specified by placing a on the end of the URL string. Multiple parameters are separated using the ampersand & character. Each parameter must also be supplied with a parameter value using the = sign. The following example illustrates creating a connection with two parameters: Msg1 and Msg2. Each parameter has a value associated with it. In this case the values are Test1 and Test2 respectively.

Image img1 = Image.getInstance(RESOURCE1); Document document = new Document(img1); PdfWriter.getInstance(document, new FileOutputStream(filename)); document.open(); img1.setAbsolutePosition(0, 0); document.add(img1); Image img2 = Image.getInstance(RESOURCE2); Adds transparent img2.setAbsolutePosition(0, 260); PNG document.add(img2); Image img3 = Image.getInstance(RESOURCE3); img3.setTransparency(new int[]{ 0x00, 0x10 }); img3.setAbsolutePosition(0, 0); Adds GIFs that are document.add(img3); made transparent Image img4 = Image.getInstance(RESOURCE4); img4.setTransparency(new int[]{ 0xF0, 0xFF }); img4.setAbsolutePosition(50, 50); document.add(img4); document.close();

Observe that you can construct a Document object with an Image object because Image extends the Rectangle class B. You don t need to do anything special for the PNG that is already transparent, but you need to use the setTransparency() method for the two GIF images. This method expects an array specifying a range of colors to be masked out. The array needs to contain 2 x n values, with n being the number of components in the image s color space. For an RGB image, you need six values: a range for red, green, and blue. The GIFs in listing 10.16 use the Indexed color space. In this case, the PDF contains a color map with 256 RGB values. Every pixel of the image can be expressed as 1 byte, corresponding to a color in the color map.

HTTP parameters cannot contain spaces. Spaces in a URL denote the end of the string. It is a good idea to encode URLs to mask spaces before sending a URL.

We started this chapter saying that there are 11 color spaces in PDF, but we only discussed 5 of them in section 10.1: DeviceGray, DeviceRGB, DeviceCMYK, Pattern, and Separation. The other six color spaces, including Indexed and ICCBased, are supported in iText when they are needed to embed images in a PDF document. You won t be confronted with them directly; that s why they aren t discussed in detail in this book.

String url = "http://localhost:7001/EnterpriseServletExample Msg1=Test1&Msg2=Test2 ; HttpConnection connection = (HttpConnection)Connector.open(url, Connector.READ_WRITE);

For RESOURCE3, you make the colors with index values of 0 to 16 transparent; the colors blue and orange of the iText logo are made transparent. For RESOURCE4, you make the white pixels transparent.

To create figure 10.10, you ll use a GIF file that was already transparent. If you add it the way you did in listing 10.16, the foreground will be red, the background will be transparent.

Once a connection has been obtained, the request method must be set. This is accomplished by calling the setRequestMethod() method on the HttpConnection instance. By default, method type is GET. SERVLET EXAMPLE 339

For this example, you ll use a java.awt.Image object and create four different instances of com.itextpdf.Image with it.

connection.setRequestMethod(HttpConnection.POST);

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