


GLPIXELZOOM(3G)					  GLPIXELZOOM(3G)


NAME
       glPixelZoom - specify the pixel zoom factors


C SPECIFICATION
       void glPixelZoom( GLfloat xfactor,
			 GLfloat yfactor )


PARAMETERS
       xfactor, yfactor Specify	 the  x	 and  y	 zoom factors for
			pixel write operations.

DESCRIPTION
       glPixelZoom specifies values for the x and y zoom factors.
       During  the  execution of glDrawPixels or glCopyPixels, if
       (xr, yr) is the current raster position, and a given  ele
       ment is in the mth row and nth column of the pixel rectan
       gle, then pixels whose centers are in the  rectangle  with
       corners at

		      (xr+nxfactor, yr+myfactor)

		  (xr+(n+1)xfactor, yr+(m+1)yfactor)

       are  candidates	for  replacement.  Any pixel whose center
       lies on the bottom or left edge of this rectangular region
       is also modified.

       Pixel  zoom  factors  are  not limited to positive values.
       Negative zoom factors reflect the  resulting  image  about
       the current raster position.

ERRORS
       GL_INVALID_OPERATION  is	 generated if glPixelZoom is exe
       cuted between the execution of glBegin and the correspond
       ing execution of glEnd.

ASSOCIATED GETS
       glGet with argument GL_ZOOM_X
       glGet with argument GL_ZOOM_Y

SEE ALSO
       glCopyPixels(3G), glDrawPixels(3G)













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