| 摘要 |
System and methods for the creation graphic images (1200) 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 (1202), and alignment in 3D space. Other techniques of the present invention include the automatic recognition of interesting points (1310), the use of screen messages to identify points (1201), the use of a secondary cursor, the creation of temporary geometry, the examination of interesting points (1310) which arise from actual geometry, temporary geometry, and/or the interaction of actual and temporary geometry, an precise graphic operations (e.g., drawing and transformations) with the assistance of interesting points (1310). |
