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<H2><A NAME="8_21">8.21 Adding bands of pattern and color to graphs</A></H2>
<P> As an additional way of emphasizing certain areas of the graph it is
 possible to add bands (either vertical or horizontal) to any one of the
 standard X-Y coordinate system based graphs. A band is a rectangular
 area that stretches one entire axis. This means that if you define a
 band between X-coordinates 3 and 5 the band area will occupy an area
 between the X-coordinates and the entire Y-range.</P>
<P> In order to access this functionality you must first make sure that
 you include the additional library file<I> jpgraph_plotband.php</I></P>
<P> At the time of this writing (current as of JpGraph 1.8) the table
 below illustrates the 8 basic types of patterns available. We will
 shortly show you how you can customize these patterns, To keep these
 examples clear we have only used one pattern in each figure.</P>
<P></P>
<TABLE style="margin-left:-4em;">
<TR><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex1.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex1.png" WIDTH="200"></A>
<BR><B>Figure 99:</B> <A href="exframes/frame_smallstaticbandsex1.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex2.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex2.png" WIDTH="200"></A>
<BR><B>Figure 100:</B> <A href="exframes/frame_smallstaticbandsex2.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD></TR>
<TR><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex7.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex7.png" WIDTH="200"></A>
<BR><B>Figure 101:</B> <A href="exframes/frame_smallstaticbandsex7.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex6.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex6.png" WIDTH="200"></A>
<BR><B>Figure 102:</B> <A href="exframes/frame_smallstaticbandsex6.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD></TR>
<TR><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex9.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex9.png" WIDTH="200"></A>
<BR><B>Figure 103:</B> <A href="exframes/frame_smallstaticbandsex9.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex10.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex10.png" WIDTH="200"></A>
<BR><B>Figure 104:</B> <A href="exframes/frame_smallstaticbandsex10.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD></TR>
<TR><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex3.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex3.png" WIDTH="200"></A>
<BR><B>Figure 105:</B> <A href="exframes/frame_smallstaticbandsex3.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD><TD><DIV class="example">
<BR> <A href="exframes/frame_smallstaticbandsex8.html" target="blank"><IMG
border="0" HEIGHT="150"  src="img/smallstaticbandsex8.png" WIDTH="200"></A>
<BR><B>Figure 106:</B> <A href="exframes/frame_smallstaticbandsex8.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
</TD></TR>
</TABLE>
<P> To add a one of these patterns to your graph you need to call the
 method <A href="../ref/PlotBand.html#_PLOTBAND_PLOTBAND">
 PlotBand::PlotBand()</A> The arguments is fairly easy to understand.
 The pattern you would like to use is specified by using the correct
 constant. You can see the name of the correct constants in the figures
 above. You also need to specify if the band should stretch along the
 vertical or horizontal axis as well as the min and max coordinates for
 the band. As coordinates you may also use the special values &quot;min&quot; and
 &quot;max&quot; which automatically sets the value to the minimum/maximum value
 of the scale. The specified numeric value will be automatically
 truncated to fit within the plot area.</P>
<P> We don't discuss the other arguments further here, instead we refer
 you to the class reference.</P>
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