Integrating iText in your web applications in Java

Making QR Code in Java Integrating iText in your web applications

Integrating iText in your web applications
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found out that you can use FDF and XFDF to store data on the filesystem. You used a PDF form to demonstrate how to establish the communication between a PDF document and its host container, the web browser, and you sent messages back and forth between an HTML page and a PDF document. Finally, you learned how to use HTMLWorker to convert HTML snippets to basic building blocks, and eventually to PDF. You also converted XML to PDF using a custommade XmlHandler. In the next chapter, we ll look at another aspect that we discussed in previous parts but that needs to be discussed in more detail: images and colors.
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This chapter covers
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Using color in PDF documents Introducing transparency Using images in PDF documents
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You ve already used color and images in previous chapters. You set the background and changed the font color of a Chunk using the BaseColor class in chapter 2. You used setColorFill() and setColorStroke() methods when you painted movie blocks on a calendar sheet in chapter 3. But that doesn t mean we ve talked about everything. One could write an entire book about color. The same goes for images. We looked at the Image class in chapter 2, but there are many other classes involved when creating an Image object: Jpeg, GifImage, TiffImage, and so on. It would lead us too far astray to go into too much detail about color and images, but this chapter will help you if you need more color or image functionality than we covered in part 1.
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10.1 Working with the iText color classes
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Colors are defined using values, and these values are interpreted according to a color space. Color spaces are expressed as PDF dictionaries, and there are eleven different color spaces available in PDF. You can find a reference to these dictionaries in the resources entry of a PDF stream. This is explained in great detail in the PDF reference; but don t worry, iText provides color classes that hide the complex theory. The most common group of color spaces is the device color space family.
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10.1.1 Device colors
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Device colors enable a conforming writer to control color precisely for a particular device. The family consists of three color spaces:
DeviceRGB The iText BaseColor class defines an RGB color. This is an additive color: red, green, and blue light is used to produce the other colors. If you add red light (#FF00000) to green light (#00FF000), for example, you get yellow light (#FFFF00). This is how a TV screen works: the colors are composed of red, green, and blue dots. RGB is typically used for graphics that need to be rendered on a screen. DeviceCMYK The opposite of RGB is a subtractive color model. If you look at an object using white light, you see a color because the object reflects and absorbs some of the wavelengths that make up the white light. A yellow object absorbs blue and reflects red and green. White (#FFFFFF) minus blue (#0000FF) equals yellow (#FFFF00). The subtractive color model is used when printing a document. You don t use red, green, and blue, but cyan, magenta, yellow, and black. The CMY in CMYK correspond with the colors in the cartridge of an ink-jet printer. The K (key) stands for black. Such a color can be created using one of BaseColor s subclasses: CMYKColor. DeviceGray The default color space when drawing lines or shapes in PDF is gray. It is expressed as the intensity of achromatic light, represented by a single number in the range 0 to 1, where 0 corresponds to black, 1 to white, and intermediate values to different gray levels. The corresponding class in iText is GrayColor, another subclass of BaseColor.
The BaseColor, CMYKColor, and GrayColor classes have different constructors. The color values can be expressed as int values from 0 to 255, or as float values from 0.0 to 1.0. The BaseColor and GrayColor classes also have a series of predefined colors.
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