AccuDraw and Auxiliary Coordinate Systems (ACS)
AccuDraw performs the function of an ACS, interactively. Using its shortcut key-ins you can quickly change to a Top <T>, Front <F>, Side <S>, or View <V> orientation. When you have an ACS loaded, you can use the <R, C> shortcut to rotate the AccuDraw compass to orientation of the current ACS. From this, you can return to the default coordinate system orientation with the <T>, <F>, <S>, or <V> shortcuts. Refer complete list of AccuDraw shortcut key-ins for a list of all the AccuDraw shortcut key-ins.
By default, the AccuDraw compass always aligns to the standard ACS plane of the view.
Locking AccuDraw to an ACS
You can lock AccuDraw to the current ACS with the <L, P> shortcut, which activates the ACCUDRAW LOCK GRIDPLANE key-in. This key-in turns on and off the ACS Plane and ACS Plane Snap locks, and the Grid view attribute for all views.
With gridplane lock:
- On — when you use the <T>, <F>, or <S> AccuDraw shortcuts, they rotate the drawing plane to the Top, Front, or Side view for the ACS.
- Off — when you use the <T>, <F>, or <S> AccuDraw shortcuts, they rotate the drawing plane to the Top, Front, or Side view for the default DGN coordinate system.
By default, the ACCUDRAW LOCK GRIDPLANE key-in also is mapped to the F8 function key.
Projecting Points from the Active ACS to the AccuDraw Plane
You can use a combination of an ACS and AccuDraw to project points, in the ACS z-direction, from the ACS plane to the AccuDraw drawing plane. This technique lets you, for example, trace the boundary of a house on to a sloping roof line.
Projecting Points to the Closest Standard ACS Plane
AccuDraw projects points that are closest to the standard ACS plane. For example, if you enter a data point in the Front view, the point is projected on the XZ plane, while if you enter a data point in the Left or Right side views, it is projected on the YZ plane. In both cases the AccuDraw compass is parallel to the plane on which the point was projected.