Inverse Command
This command allows you to determine the bearing and distance
between the endpoints of a line or a curve by entering the points
that define the line or curve.
After choosing the Inverse menu item you are asked to "Enter point
sequence". A point sequence is a series of points that define
the points being used to calculate the inverse. You may enter
one point ID at a time to inverse from point to point. You
may enter the two points separated by a dash (5-7), etc.
Enter point sequence
[Point group/Reset/sNap on] (last point = <none>}: 5
[cLockwise curve/ccW curve/Point group/Reset/sNap on] (last
point = 5): 7
Note that 5 is now displayed as the “Last Point”. This means
that when 7 is entered at the command line the inverse will be
calculated from point 5 to point 7.
To "Reset" the last point enter R or “.” and <Enter>
for Reset. The last point will now be shown as <none>.
Inversing Around Curves
Clockwise
To inverse around a clockwise curve (one curving to the right),
enter the PC point ID then enter “L” or “+” to indicate a clockwise
curve. Next enter the point ID of the radius point of the
clockwise curve and follow with the PT point ID.
For Example:
First enter the PC of the curve. In this example type or pick point
ID 2201
Enter point sequence
[cg-Point-group/Reset/turn-Snap-on] (last point = <none>):
2201
Now type L or “+” and <Enter> for a clockwise curve
Enter point sequence
[clockWise curve/Ccw curve/Point group/Reset] (last point =
2201):L
Next type or pick the radius point ID 2200
Enter radius point for curve [Reset/sNap on]: 2200
You may also use the mouse to pick a C&G Arc. In this case, the
arc’s radius point will be used
Next type or pick the PT point ID 2202
Enter point of tangency (PT) for curve [Reset/sNap]: 2202
Inversing Around Curves Counter
Clockwise
To inverse around a curve in a counter-clockwise direction (curving
to the left) simply type W or “-” and <Enter> then proceed as
with a clockwise curve.
Inversing between a series of
points in the coordinate file
By entering 2 point numbers separated by a “+” you can
inverse through successive point IDs in the order they are found in
the coordinate file (either numeric or alphabetic order). For
example, if you enter 3+6, inverses will be calculated and
displayed from point 3 to 4, 4 to 5 and 5 to 6. You can use the
<F2> key to view the information printed at the command line
or you can view the print file (CGFile > Print/View Print File).
Inversing using Point
Groups:
You can use a Point Group to inverse between a series of
points specified by the point group. To specify a point group type
a P or ‘*’ and <Enter> at the command line. This will
display a dialog box showing the Point Groups currently in the
default directory.
Prompts
Enter point
sequence
[Point group/Reset/sNap on] (last
point = <none>]: Enter or pick the first point on a
line or the PC of a curve. Type "P" and Enter to use a point
group to specify the inversing sequence. Type "R" and Enter
to Reset the last point. Type "N" and Enter to turn on CAD
snaps (these are turned off when the command starts).
[cLockwise curve/ccW curve/Point
group/Reset/sNap on] (last point = 5): Enter or pick
the next point ID to inverse to or type "L" and Enter or "W" and
Enter to specify the radius point of a curve.
if you are entering a curve:
Enter radius point for curve
[Reset/turn_Snap_on]: Enter or pick the radius point for the
curve.
Enter point of tangency (PT) for
curve [Reset/turn_Snap_on]: Enter or pick the PT point for
the curve.
Pulldown Menu Location:
CG-Survey > Cogo
Keyboard Command:
cg_inverse
Prerequiste:
coordinate file
