Procedure SetViewPort (X1,Y1,X2,Y2 : Integer; Clip : Boolean) ;
Sets the current graphical view-port (window) to the rectangle defined by the top-left corner (X1,Y1) and the bottom-right corner (X2,Y2). If Clip is true, anything drawn outside the view-port (window) will be clipped (i.e. not drawn). Coordinates specified after this call are relative to the top-left corner of the view-port.
None.