Autotek autocad raster design 2010 用户手册

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NOTE Using an AutoCAD command such as MOVE causes the primitive object
to be different from the original image. Raster Design erases the original raster
data from the source image. For more information, see 

 (page 166).

You can define three primitive objects: lines, arcs, and circles. You can also
use two other methods:

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The Smart Pick command automatically detects the geometry of the selected
raster entity and defines the entity as a primitive line, arc, or circle.

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Define a primitive object using the geometry of an existing vector line,
arc, or circle.

If your REM primitive is defined over an intersection, the intersection is
preserved even after you move the primitive object.

NOTE You cannot remove subsections of a primitive object.

Grip behavior depends on the primitive object you define:

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A line has three grips: one at the start, one at the end, and one in the center
of the line. Grip editing a REM line is the same as editing an AutoCAD

Defining REM Primitive Objects | 179