Sector of small circle defined via mouse input
sectorg prompts the user
to indicate by two successive mouse clicks two points that define
the center and radius of a small circle arc. By default, the angular
width of the sector is 60º. The sector is constructed using the
vector defined by the mouse clicks as the reference azimuth (defined
to run through the center of the sector).
Once a sector has been drawn, Shift+clicking on it displays four control points (center point, arc resize, radial resize, and rotation controls), and the associated Sector control window. You can graphically interact with sectors as follows:
To translate the circle, click and drag the center (o) control.
To change the arc size, click and drag the resize control (square).
To change the radial size of the sector, click and drag the radial control (down triangle).
To rotate the arc, click and drag the rotation control (x).
You can also modify a selected sector by entering the appropriate values in the Sector control window and then pressing Enter or clicking the Close button. Display of the control panel is toggled by Shift+clicking the sector. If you select multiple sectors, a separate Sector control window will appear for each one.
Sector control windows are superimposed at the same location. A valid map axes must exist prior to running this function.