Read e-book online Building Tablet PC Applications PDF

By Rob Jarrett

ISBN-10: 0735617236

ISBN-13: 9780735617230

Offers an authoritative dialogue of pen-based consumer interfaces and gives an in-depth exposition of the capsule computing device Ink SDK, entire with improvement suggestions and methods

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You should take precautions to reduce the negative effects of parallax in your applications. One precaution is to make sure that controls are big enough to be easily targeted. Another equally important improvement is to offer clearly visible cursors that track pen movement so that the user can reference the cursor†s position on screen as the authoritative point of interaction even if parallax is present. Without a reasonably sized cursor that can†t be blocked by the pen itself, it†s difficult for the user to know what to expect when tapping.

A Bézier curve. Bézier curves use a number of control points that affect the appearance of the curve. All four control points of the curve are shown. Antialiasing Even after fitting an ink stroke to a curve has smoothed it out, the edges of the stroke might still appear to be slightly rough. This roughness is caused by the size of the screen†s pixels, which are big enough for the eye to make out individually. Because some pixels are part of the ink stroke and others (presumably the background) are not, there is a jagged steplike appearance at the edge of a stroke.

In fact, many languages not based on Latin script have complex alphabets that are difficult to type. In such languages, the size of the alphabet dwarfs the number of keys available on a keyboard, requiring users to type characters by using complicated combinations of keys. Worsening the problem, typical words in some of these languages have many homonyms, making phonetic spelling difficult as well. The average inexperienced typist using such a language (Chinese, for example) enters text at a painfully slow speed.

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Building Tablet PC Applications by Rob Jarrett


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