DRAW

        [GREG1\]DRAW Argument Xc Yc [/CLIP] [/BOX N] [/CHARACTER  N]  [/USER
    [code]]

    This is a powerful command which allows you  to  make  drawings  without
    data  either  by  specifying  coordinates  (Xc,Yc)  and  action  desired
    (Argument), or by interactive use of a cursor.

    The cursor is obtained if Xc and Yc are  omitted,  and  the  appropriate
    action  is  then  specified  by  keys  typed  at  the keyboard: R is for
    RELOCATE, L for LINE, M for  MARKER,  A  for  ARROW,  T  for  TEXT.   In
    addition,  C  works  like  T, but prompts for the centering parameter in
    addition to the text. D can be used to DELETE the  last  operation,  and
    has  no  action  on  the operations which were plotted previously to the
    current DRAW command.  (Presently D has  no  visible  action.  Use  ZOOM
    REFRESH  after.)  E  exits  from  the  cursor  routine. ^C will exit AND
    generate an error, which can be trapped (useful to regain control inside
    of forever SIC loops calling the interactive cursor repeatedly).

    Other keys gives you the cursor coordinates (in the current angular unit
    when  a  projection  is  defined),  except that keys `0' `1' `2' and `3'
    temporarily (i.e., as long one does not exit from cursor  mode)  changes
    the current angular unit in which the cursor coordinates are returned.

    For X11 displays, you may use the mouse buttons for the commands R (left
    mouse button), L (middle mouse button), and E (right mouse button).

    The complete command is written to the LOG_FILE so that you  can  replay
    it  easily.  The option allows you to supersede the default value of the
    coordinate system defined by SET COORDINATE or  to  keep  clipping.  The
    code suboption in the /USER option, if present, can be any of `SECONDS',
    `MINUTES', `DEGREES', `RADIANS' (in which case the Xc and Yc coordinates
    are  taken to be in the corresponding unit) or `ABSOLUTE' (in which case
    Xc and Yc  are  taken  as  absolute  coordinates,  usually  exprimed  in
    sexagesimal format). The presence of the code suboption is valid only if
    a PROJECTION and a SYSTEM (EQUATORIAL or GALACTIC) are both defined.

    When using the explicit form, Xc and Yc may be equal to  *  to  use  the
    current pen position.

    Any "realistic" combination of literal  values,  0-d  and  1-dimensional
    variables is accepted for that command. For example,
    DRAW MARKER A B /USER MINUTES
    will plot markers at each location given by  the  two  arrays  A  and  B
    (provided  they  are of the same size). A and B must be CHARACTER arrays
    in the case where the "/USER ABSOLUTE" option is used.