| 
	    plcalc_world
	  ( | rx, | 
| ry, | |
| wx, | |
| wy, | |
| window ); | 
      Calculate world coordinates,
      wxwywindowrxry
rx
	  (PLFLTInput relative device coordinate (0.0-1.0) for the x coordinate.
ry
	  (PLFLTInput relative device coordinate (0.0-1.0) for the y coordinate.
wx
	  (PLFLT_NC_SCALAR
	    Returned value of the x world coordinate corresponding
	    to the relative device coordinates
	    rxry
wy
	  (PLFLT_NC_SCALAR
	    Returned value of the y world coordinate corresponding
	    to the relative device coordinates
	    rxry
window
	  (PLINT_NC_SCALAR
	    Returned value of the last defined window index that corresponds to the
	    input relative device coordinates (and the returned world
	    coordinates).  To give some background on the window index,
	    for each page the initial window index is set to
	    zero, and each time plwind is called within the page, world
	    and device coordinates are stored for the window and the window
	    index is incremented.  Thus, for a simple page layout with
	    non-overlapping viewports and one window per viewport,
	    windowrxrywindow
Redacted form:
	    General: plcalc_world(rx, ry, wx, wy, window)
	  
This function is used in example 31.