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<A HREF="toc.html">Contents</A>
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<A HREF="727Usinggroupedaccumulatedbargraphs.html">Previous</A>
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<HR NOSHADE>
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<H3><A NAME="7_2_8">7.2.8 Horizontal bar graphs</A></H3>
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<P> It can often come in handy to have horizontal bar graphs especially
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if you have a large number of values to display. Even though JpGraph
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doesn't directly support horizontal bar graphs this is easy achieved by
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constructing a normal vertical bar graph which is then rotated 90
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degrees.</P>
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<P> The example below shows a simple example of this<DIV class="example">
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<BR> <A href="exframes/frame_horizbarex3.html" target="blank"><IMG border="0"
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HEIGHT="500" src="img/img/img/img/img/img/horizbarex3.png" WIDTH="400"></A>
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<BR><B>Figure 44:</B> A typical horizontal bar graph with the Y-axis at
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the bottom <A href="exframes/frame_horizbarex3.html" target="blank">
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[src]</A>
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<P></P>
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</DIV></P>
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<P></P>
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<P> In order to achieve this effect you should study the above example
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carefully and you might notice two things</P>
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<UL>
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<LI> We don't simply rotate the graph we also specify that we want the
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rotation center to be the middle of the entire image. The reason for
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this is that by default (See the section on rotating plots) the pivot
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point for rotation is the center of<STRONG> the plot area</STRONG>.
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Since the center of the plot area is not necessary the center of the
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entire image the rotation might be a little bit difficult to predict
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since it will depend on the margins specified. <</LI>
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<LI> The size of the plot area is determined from the original width and
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height of the image taking the specified margin into account. When the
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the plot area is rotated 90 degrees clockwise what was the left margin
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now in effect become the upper margin and so on. This is a small nuance
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since we conceptually want to specify the margins directly in the
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rotated plot.
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<BR> In order to more easily handle the margin with rotated images it is
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recommended that the method "Set90AndMargin()" is used. This allows the
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image to be rotated as well as specifying the margins in an obvious
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way.</LI>
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</UL>
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<P> We finally show three more examples of horizontal bar plots. In the
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first plot we have hidden the Y-axis and in the second we have
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positioned the Y - axis at top as opposed to the bottom as the first
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example shows.</P>
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<P><DIV class="example">
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<BR> <A href="exframes/frame_horizbarex1.html" target="blank"><IMG border="0"
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HEIGHT="500" src="img/img/img/img/img/img/horizbarex1.png" WIDTH="400"></A>
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<BR><B>Figure 45:</B> Horizontal bar graph with hidden Y axis <A href="exframes/frame_horizbarex1.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P><DIV class="example">
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<BR> <A href="exframes/frame_horizbarex2.html" target="blank"><IMG border="0"
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HEIGHT="500" src="img/img/img/img/img/img/horizbarex2.png" WIDTH="400"></A>
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<BR><B>Figure 46:</B> Horizontal bar graph with Y axis at the top <A href="exframes/frame_horizbarex2.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P></P>
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<P> In the final example which is almost similar to the two first we
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illustrate the use of labels with more than one line.<DIV class="example">
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<BR> <A href="exframes/frame_horizbarex4.html" target="blank"><IMG border="0"
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HEIGHT="500" src="img/img/img/img/img/img/horizbarex4.png" WIDTH="400"></A>
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<BR><B>Figure 47:</B> Horizontal bar graph with manual integer scale as
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well as multiple line labels <A href="exframes/frame_horizbarex4.html" target="blank">
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[src]</A>
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<P></P>
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</DIV></P>
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<P></P>
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