Used to overlay one HLU plot object over a specific style of transformation.
procedure overlay (
base : graphic,
plot : graphic
The bottom element of the overlay chain of plots. The object
referenced must support overlays.
Graphical object to be added to the top of the overlay.
Overlay is used to set a plot so it will be drawn over one or more other plots.
When a plot is added to an overlay, the new plot will be drawn on top of all
of the plots currently in the overlay list. overlay calls
the HLU function NhlAddOverlay.
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$Revision: 1.9 $ $Date: 1998/06/15 21:30:21 $