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SETVIEWP.KEY
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1993-11-07
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* setviewport internal
setviewport(x1,y1,x2,y2,clip) sets the view port from (x1,y1) to (x2,y2) on
the graphics screen. Everything is unvisible if it it out of the (x1,y1)
to (x2,y2). It only works on the graphics mode.
e.g. graph, line(100,100,300,300), setviewport(200,200,300,300,1),
line(100,200,100,200), readchar, text
See also: graph, text.