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NAME

       im_sines - creates a spatial sine wave form

SYNOPSIS

       #include <vips/vips.h>

       int im_sines(image, xsize, ysize, horfreq, verfreq)
       IMAGE *image;
       int xsize, ysize;
       double horfreq, verfreq;

DESCRIPTION

       im_sines() creates a float one band image of the a sine waveform in two
       dimensions.  The sizes of the created image are xsize  by  ysize.   The
       number of horizontal and vertical spatial frequencies are determined by
       the variables horfreq and verfreq respectively.  The  function  is  the
       base  for  creating  displayable  sine  waves  and  square waves in two
       dimensions.

RETURN VALUE

       The function returns 0 on success and -1 on error.

SEE ALSO

       im_grey(3).

COPYRIGHT

       N. Dessipris

AUTHOR

       N. Dessipris - 10/05/1991

                                  10 May 1991