rectzoom(3G)							  rectzoom(3G)

NAME    [Toc]    [Back]

     rectzoom -	specifies the zoom for rectangular pixel copies	and writes

C SPECIFICATION    [Toc]    [Back]

     void rectzoom(xfactor, yfactor)
     float xfactor, yfactor;

PARAMETERS    [Toc]    [Back]

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

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

DESCRIPTION    [Toc]    [Back]

     rectzoom specifies	independent x and y zoom factors that rectcopy,
     rectwrite,	and lrectwrite use.  rectzoom scales the source	image by the
     numbers specified by xfactor and yfactor.	If rectzoom(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    [Toc]    [Back]

     lrectwrite, pixmode, rectcopy, rectwrite

NOTE    [Toc]    [Back]

     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.


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