rectzoom(3G)rectzoom(3G)NAMErectzoom - specifies the zoom for rectangular pixel copies and writes
C SPECIFICATION
void rectzoom(xfactor, yfactor)
float 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.
DESCRIPTIONrectzoom 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
lrectwrite, pixmode, rectcopy, rectwrite
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.
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