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<H1><A NAME="SECTION0012140000000000000000">
4.14 Specifying area fill attributes</A>
</H1>
<P>
<A NAME="4297"></A><A NAME="4298"></A><A NAME="4299"></A><A NAME="4300"></A><A NAME="4301"></A><A NAME="4302"></A><A NAME="4303"></A><A NAME="4583"></A>
<P>
Many plotting programs will allow the user to draw filled polygons or
symbols. The fill may take two forms:
<P>
<BR>
<P>
<B>-G</B><I>fill</I>
<P>
<P>
<B>-Gp</B><I>dpi/pattern</I>[:<B>B</B><I>r/g/b</I>[<B>F</B><I>r/g/b</I>]]
<P>
<BR>
<P>
In the first case we may specify a <I>gray</I> shade (0-255) or a color
(<I>r</I>/<I>g</I>/<I>b</I> in the 0-255 range), similar to the pen color
settings. The second form allows us to use a predefined bit-image pattern.
<I>pattern</I> can either be a number in the range 1-90 or the name of a 1-,
8-, or 24-bit Sun raster file. The former will result in one of the 90
predefined 64 x 64 bit-patterns provided with <A NAME="tex2html254"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> and reproduced in Appendix E.
The latter allows the user to create customized, repeating images using
standard Sun rasterfiles. The <I>dpi</I> parameter sets the resolution of
this image on the page; the area fill is thus made up of a series of these
``tiles''. Specifying <I>dpi</I> as 0 will result in highest resolution
obtainable given the present dpi setting in <U>.gmtdefaults</U>.
By specifying upper case <B>-GP</B> instead of <B>-Gp</B> the image will be
bit-reversed, i.e., white and black areas will be interchanged (only applies
to 1-bit images or predefined bit-image patterns). For these patterns and
other 1-bit images one may specify alternative background and foreground
colors (by appending :<B>B</B><I>r/g/b</I>[<B>F</B><I>r/g/b</I>]) that will
replace the default white and black pixels, respectively. Setting one of the
fore- or background colors to - yields a transparent image where only the
back- or foreground pixels will be painted.
Due to <I>PostScript</I> implementation limitations the rasterimages used with
<B>-G</B> must be less than 146 x 146 pixels in size; for larger images see
<A NAME="tex2html255"
HREF="../psimage.html"><I><B>psimage</B></I></A><A NAME="4815"></A>. The format of Sun raster files is outlined in Appendix B.
Note that under <I>PostScript</I> Level 1 the patterns are filled by using
the polygon as a <I>clip path</I>. Complex clip paths may require
more memory than the <I>PostScript</I> interpreter has been assigned.
There is therefore the possibility that some <I>PostScript</I> interpreters
(especially those supplied with older laserwriters) will run out of memory
and abort. Should that occur we recommend that you use a regular grayshade
fill instead of the patterns. Installing more memory in your printer
<I>may or may not</I> solve the problem!
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<ADDRESS>
Paul Wessel
2001-04-18
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