If you are using angles other than the default measured counter-clockwise from the positive X-axis, you will need to know the difference between two related commands: (getangle) and (getorient).
- The (getangle) function measures with the zero-angle at the current base angle setting in the Units dialog (system variable ANGBASE).
- The (getorient) function always measures with the zero-angle to the right (east, or positive X-axis), regardless of the ANGBASE setting.
- The system variable ANGBASE controls the zero (0) direction for angles. By default it is set to 0, the positive X-axis. If you set it to 90 then zero will be north or the positive Y-axis. You can use any angle.
- The system variable ANGDIR controls the angle direction: 0 for counter-clockwise (the default) or 1 for clockwise.
Explanation: the (getangle) and (getorient) functions
(getangle [point] [prompt])
(getorient [point] [prompt])
The optional [point] lets you include a point (usually a symbol that points back to information that gives you a point) that defines the first point of the angle. The optional [prompt] allows you to prompt the user.
Both these functions return a real number representing the value in radians of an angle entered either by pointing or by typing a value.
- All replies are in radians.
When ANGBASE and ANGDIR are set to the AutoCAD default, both functions give you the same information:
2.35619 135 degrees
2.35619 135 degrees
Changing the system variable ANGBASE to 90 (North or Y-axis) results in:
2.35619 135 degrees, based on current ANGBASE
3.92699 225 degrees, based on default ANGBASE
Further changing the system variable ANGDIR to clockwise (1) results in:
3.92699 225 degrees, based on current ANGBASE
5.49779 315 degrees, based on default ANGBASE
- The angle input by the user is based on the current ANGDIR, but both (getangle) and (getorient) ignore ANGDIR in the value returned.
- If ANGBASE is set to 90, using (getangle) for BLOCK insertions will allow an input of 0 to equal 0.
- If ANGBASE is set to 90, using (getorient) for TEXT insertions will allow an input of 0 to insert text along the X-axis.