rectzo(3G)

NAME
     rectzo - specifies the zoom for rectangular pixel copies and writes

FORTRAN 77 SPECIFICATION
     subroutine rectzo(xfactor, yfactor)
     real xfactor, yfactor

PARAMETERS
     xfactor   expects the multiplier of the rectangle in the x direction.

     yfactor   expects the multiplier of the rectangle in the y direction.

DESCRIPTION
     rectzo specifies independent x and y zoom factors that rectco, rectwr,
     and lrectw use.  rectzo scales the source image by the numbers specified
     by xfactor and yfactor.  If rectzo(2.0, 3.0) is called, and the following
     rectangle is copied:

          1  3
          5  7

     the copy will be:

          1  1  3  3
          1  1  3  3
          1  1  3  3
          5  5  7  7
          5  5  7  7
          5  5  7  7

     Although zoom factors are specified as floating point values, some
     graphics systems do not support fractional zooms.  These systems round
     each floating point zoom factor to the nearest integer value.  Systems
     that do support fractional zoom replicate source image pixels when the
     zoom factor is greater than 1.0, and decimate the source image when the
     zoom factor is less than 1.0.

     By default, xfactor and yfactor are 1.0.

SEE ALSO
     lrectw, pixmod, rectco, rectwr

NOTE
     This subroutine is available only in immediate mode.

     IRIS-4D G, GT, and GTX models, the Personal Iris, Iris Entry, Indy, XL,
     XS, XS24, XZ, Elan, and Extreme systems do not support fractional zoom.
     The Personal Iris, XS, XS24, XZ, Elan, and Extreme systems do not support
     zoom factors greater than 255.0.