_SetViewport Procedure
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Arguments
x1, y1 Upper-left corner of viewport to be set
x2, y2 Lower-right corner of viewport to be set
Description
The _SetViewport procedure redefines the graphics viewport. It
defines a clipping region just as the _SetClipRgn procedure does.
The viewport origin is set to the upper-left corner of the clipping
region. Physical coordinates (x1,y1) and (x2,y2) are the diagonally
opposed corners of the rectangular clipping region.
After a viewport is set, any window transformation done with
_SetWindow applies only to the viewport, not to the entire screen.
_GrStatus Returns
_GrNotInProperMode, _GrParameterAltered