Chapter 12
Interactive
Graphical Visualizations with SVG
IN THIS CHAPTER
• Vector Graphics to
Complement Bitmap Graphics
• SVG: An XML Standard for Vector Graphics
• Creating an Interactive
Graphical Visualization
• SVG Structure and Elements
• Development Primer
• The Future of SVG
In the information age, we are growing to depend on being able to
quickly and accu-rately identify relevant information and make good decisions
based on it. Nowhere is this more true than on the Internet, where there is a
veritable sea of information we are only beginning to harness the power of. An
often quoted rule of thumb is that making a good decision involves 90 percent
presentation and only 10 percent interpretation. One of the most effective ways
of presenting information in a form that can be rapidly assimilated is
graphically—thus the saying, “A picture is worth a thousand words.” We are all
familiar with the bitmap GIF and JPEG images, which are already pervasive
across the Internet. Although bitmap graphics are powerful and appropriate for
certain types of applications (in particular, photographs), they are not
appropriate for many of the uses for which they are currently employed, due in
part to primitive support for graphics in the early stages of the growth of the
Web. Vector graphics, on the other hand, is a powerful, well-estab-lished type
of graphical representation that is complementary to bitmap graphics. This
chapter introduces, discusses, and demonstrates how a new vector graphics
language called Scalable Vector Graphics (SVG) may be used to deliver powerful
new interactive business applications. This chapter shows how SVG, an XML
vector graphics standard, may be used to visualize and make sense of any type
of XML content (for example, over the Web). Beyond simply showing the ability
to apply SVG as an alternative graphics presentation language, this chapter
shows how the power of SVG may be rapidly and easily applied to visualize and
make sense of a sea of XML data in a variety of XML formats.
In this chapter you will learn
The differences between bitmap
and vector graphics and how they complement each other
The SVG implementation of vector
graphics, including the standard, structure, and elements
How to develop interactive
graphical applications that visualize XML data using
SVG
About future SVG developments
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