- specify the pixel zoom factors



C SPECIFICATION


PARAMETERS

       _param1, _param2 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+n._eqnparam1, yr+m._eqnparam2)

               (xr+(n+1)._eqnparam1, yr+(m+1)._eqnparam2)

       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, glDrawPixels



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