viewport(3G) viewport(3G)
NAME
viewport - allocates an area of the window for an image
SPECIFICATION
C viewport(left, right, bottom, top)
Screencoord left, right, bottom, top;
FORTRAN subroutine viewpo(left, right, bottom, top)
integer*4 left, right, bottom, top
DESCRIPTION
viewport specifies, in pixels, the area of the window that
displays an image. Specifying the viewport is the first
step in mapping world coordinates to screen coordinates.
The portion of world space that window, ortho, or
perspective describes is mapped into the viewport. left,
right, bottom, top coordinates define a rectangular area on
the screen.
viewport also loads the screenmask.
SEE ALSO
scrmask, getviewport, popviewport, pushviewport
Programming Guide, Section 4.4, Viewports
Page 1 (printed 8/20/87)