Building Tablet PC Applications by Rob Jarrett

By Rob Jarrett

Provides an authoritative dialogue of pen-based consumer interfaces and gives an in-depth exposition of the capsule notebook Ink SDK, entire with improvement tips and tips

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Pen Action Terminology Term Action The pen stays within the detection range of the digitizer without actually touching the screen. Hover Windows XP Tablet PC Edition maps this action to a mouse movement. The pen touches and lifts from the screen within a short amount of time. While touching the Tap screen, it does not travel more than a few pixels (if at all). This action is mapped to a left mouse button click. The pen taps twice in quick succession, traveling little or no distance between the taps.

Selection, after all, is a prerequisite for all other ink manipulation actions. Many of the benefits of digital ink, such as being able to change its color and move it around, are predicated on the ink being selectable. Just as text selection in a word processor is critical to its functionality, ink selection in a Tablet PC application is core to the inking experience. There are, however, major differences in the way that selection is performed, depending on the application and the document type.

However, the digitizer†s readings tell a completely different story. As you can see, the digitizer hardly thinks that the lines were straight. It was misled by electromagnetic signals arising from the hardware below it. These signals commingle with the signals the pen generates, resulting in an inaccurate reading by the digitizer. 32 33 Figure 2-7. A Tablet PC†s digitizer readings of what began as straight lines drawn on its surface. Notice the strong correlation between certain parts of the underlying hardware and the visible distortion.

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