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<H1><A NAME="SECTION0012120000000000000000">
4.12 Overlay and Continue Modes</A>
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<P>
A typical <I>PostScript</I> file has a beginning, a middle, and
an end. The beginning defines certain features (e.g., macros,
origin, orientation, scale, etc.) which will be needed to
create the plot. The middle has the commands which actually do
the plotting. The end tells the graphics device to put out
the plot (<TT>showpage</TT> in <I>PostScript</I>) and reset the graphics
state. Many of the illustrations in this cookbook are built up
by appending <I>PostScript</I> files together.
If you do this, the first file needs a ``beginning'' and no ``end'',
the last an ``end'' but no ``beginning'', and the middle files need
only a ``middle''. You accomplish this automatically with the
Overlay (<B>-O</B>) and Continue (<B>-K</B>) options. Overlay
indicates that this plot will be laid on top of an earlier one;
therefore the ``beginning'' is not included in the output. The
default is always no overlay, i.e. write out the ``beginning''.
Continue indicates that another plot will follow this one later;
therefore the ``end'' is not included in the output.
The default is to output the ``end''. If you run only one plot
program, ignore both the <B>-O</B> and <B>-K</B> options; they are
only used when stacking plots.
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<ADDRESS>
Paul Wessel
2001-04-18
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