Technique for providing improved user feedback in an interactive drawing system
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United States of America Patent
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-
Dec 6, 1994
Issued Date -
N/A
app pub date -
Oct 8, 1991
filing date -
Apr 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
System and methods for the creation of graphic images include automatic pull-off creation and maintenance of tangent and perpendicular lines, creation and maintenance of objects satisfying mutual geometric relationships, the identification and processing of visual intersections, and alignment in 3D space. Other techniques of the present invention include the automatic recognition of interesting points, the use of screen messages to identify points, the use of a secondary cursor, the creation of temporary geometry, the examination of interesting points which arise from actual geometry, temporary geometry, and/or the interaction of actual and temporary geometry, and precise graphic operations (e.g., drawing and transformations) with the assistance of interesting points.
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Cited Art Landscape
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