Autodesk 00126-050008-1620A - Autocad 2006 Essentials, User Manual

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12 Tracing
187
The Table describes the parameters of the Trace tab.
Parameter Description
Line Follow
Orthogonalization If this option is on, then the line following tracing automatically
aligns segments of created polylines perpendicular to each
other. All segments become either perpendicular or parallel
with the base angle. The base angle is set in the
Base angle
box of the Options tab. If the Auto checkbox is on, then the
program automatically defines the base angle by the direction
of the polylines longest segment. The
Approximation Accuracy
setting in the Options tab controls the maximum angle of
deviation that segments can have in relation to the Base angle
and still fall under orthogonalization.
You can use this option when tracing raster objects consisting
of perpendicular segments, for example, when tracing
buildings on plans.
Auto estimate base
angle Sets the mode which automatically defines the base direction
of polyline segments orthogonalization. The base angle for
each traced polyline is defined separately.
Base Angle Ÿ Enter an angle specifying the base direction of
orthogonalization.
- or –
Ÿ Click the button at the box name and specify two points on
the image. The angle value between the line connecting these
points and the axis X will be shown in the
Base angle .
Setting on Auto estimate base angle has the higher priority
over this option.
Auto Detect
Direction Sets the mechanism by which the program will automatically
define the direction of tracing. After the program reaches a
node, it tries to find the following raster line part, which is an
extension of the traced object.
Pause Sets a period in seconds, during which you should choose a
segment to extent tracing when the
Auto Detect Direction
mode of tracing extension is on. Unless the user specifies
manually any other extension for the indicated period, the
program will continue tracing in the automatically selected
direction. Setting
Pause to 0 disables this option.
Place vertex on
nodes If this checkbox is on,when tracing polylines, then the
program inserts vertices at intersections of a generated vector
polyline with raster objects (nodes).