This article presents a drawing component used by an image-annotation application named JImaging. Some of the JImaging code has already been described in two other articles, titled "Prototyping Desktop Applications" and "Data Models for Desktop Apps."
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Swing provides a complete set of standard GUI components, ranging from simple buttons and text fields to feature-rich tables, trees, and text editors. These components are fully customizable, but you might find that Swing's built-in components don't offer everything you need. For example, financial and monitoring applications use charts to present their data graphically. Of course, before starting to build your own chart components, you should evaluate some of the existing chart frameworks, in case someone has already created the component you need. Sometimes, this isn't the case, or perhaps the licensing terms are not acceptable, which means that you have to develop the custom component required by your application yourself.
JImaging's PaintView class extends javax.swing.JComponent, like any regular Swing component. The JComponent class provides many features shared by all Swing components, such as the support for double buffering, which eliminates the flashing effect that occurs when the graphic objects are painted directly onto the screen. With double buffering, the UI components are painted into a buffer, and when the painting is done, the buffer is copied to your screen very quickly.
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