RROTAT (Feb93)                    model                   RROTAT (Feb93)



NAME
    rrotat
    
    
USAGE
    rrotat lsinim lsotim modesw xcentr ycentr rangle
    
    
PARAMETERS
    
    lsinim
        List of input image names.
    
    lsotim
        List of output image names.
    
    modesw
        Switch for edge handling; 1-zero fill.
    
    xcentr
        x-coord of the center of the image in pixels.
    
    ycentr
        y-coord of the center of the image in pixels.
    
    rangle
        Rotation angle in degrees.
    
    
IMAGE HEADER WORDS
    
    The  three  image  dimension  parameters are read from the header of
    the input image: LSINIM,
    
    The header for the output image, LSOTIM, is copied from  the  header
    for the input image, LSINIM.
    
    The  task  writes  processing  history  information  into the output
    header using 'gr_history' from 'grutil/'.
    
    
DESCRIPTION
    
    RROTAT  is  from  Tim  Brown's  Fourier  tachometer  modeling  code, 
    "FAKEFT".
    
    RROTAT  rotates  the  array  in LSINIM about XCENTR,YCENTR by RANGLE
    and puts the result into LSOTIM.  The direction of rotation is  from
    the first index direction into the second index direction.
    
    MODE=1  causes  values  rotated  into  the  array from outside to be
    zero.  MODE=2 causes values rotated into the array from  outside  to
    be set to nearest array value before rotation.
    
    The  routine  goes  through  the  output image point by point asking
    where each point came from through  the  rotation;  then   computes,
    taking  the value of mode into account, the value of the image using
    bi-linear interpolation.
    
    
EXAMPLES
    
    
TIME REQUIREMENTS
    
    
BUGS
    
    
SEE ALSO
    expand
    genvim
    random