% @(#)extracrota.hlq	17.1.1.1 (ESO-IPG) 01/25/02 17:43:35 
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
%.COPYRIGHT  (c)  1990 European Southern Observatory
%.IDENT      extracrota.hlq
%.AUTHOR     KB, IPG/ESO
%.KEYWORDS   MIDAS, help files, EXTRACT/ROTATED_IMAGE
%.PURPOSE    On-line help file for the command: EXTRACT/ROTATED_IMAGE
%.VERSION    1.0  20-SEP-1990 : Creation, KB
%----------------------------------------------------------------
\se
SECTION./ROTA
\es\co
EXTRACT/ROTATED_IMAGE					20-SEP-1990   KB
\oc\su
EXTRACT/ROTATED_IMAGE steps frame
	extract a rotated subimage from displayed image
\us\pu
Purpose:      
              Extract a rotated subimage from displayed image.
\up\sy
Syntax:       
              EXTRACT/ROTATED_IMAGE [steps] [frame]
\ys\pa
              steps = stepsize in x and y for the extracted image,
                 default is stepsize in x and y of displayed image
\ap\pa
              frame = name for result frame, default is 'subframe.bdf'
\ap\no
              Use the mouse to move the cursor to define the base line of the
              subimage across the currently displayed image. 
              Press the ENTER button to fix this line. 
              Then use the cursor (mouse) to define the corners of the rotated
              subimage.
\\ 
              If the baseline is parallel to one axis, the command will
              abort - you should use EXTRACT/CURSOR or EXTRACT/IMAGE for this
              case.
\on\see
See also:     
              EXTRACT/CURSOR, EXTRACT/IMAGE
\ees\exs
Examples:
\ex
              EXTRACT/ROT 0.4,0.4 zopilote
                Extract a rotated subimage from the displayed image by using
                the interactively defined endpoints and resampling (using 
                stepsize of 0.4 for x and y) along the lines of the subimage
                via bilinear interpolation.
                Result frame will be `zopilote.bdf'.
\xe \sxe