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<H2><A NAME="7_8">7.8 Specifying the scale manually</A></H2>
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<P> Normally the automatic scaling should be doing an adequate job in
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 most circumstances but there might be cases where you like to manually
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 set the scale. For example if you have several graphs where you like to
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 be able to easily compare them and therefore want them all to have the
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 same scale.</P>
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<P> To specify a manual scale you have to add arguments to the standard <A
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href="../ref/Graph.html#_GRAPH_SETSCALE"> Graph::SetScale()</A> method.
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 So to specify that you want an Y-scale between 0 and 100 you need to
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 write<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
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&nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
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SetScale</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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&quot;textlin&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">0</FONT><FONT
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color="#007700">,</FONT><FONT color="#0000BB">100</FONT><FONT color="#007700">
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);</FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV></P>
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<P>When you specify a scale manually there is one additional thing you
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 need to decide. How the tick marks should be positioned. You have three
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 choices</P>
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<OL>
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<LI> Let JpGraph decide suitable tick marks honoring the exact scale you
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 specified.<B> This is the default behavior</B> if you don't do anything
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 else.</LI>
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<LI> Allow JpGraph to slightly adjust your specified min and max values.
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 With the default method, depending on the min and max values, the end
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 and start of the scale might not fall on an exact tick mark. For
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 esthetic reasons you might still want the last/first tick mark to fall
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 on the edges of the scale. By calling <A href="../ref/LinearScale.html#_LINEARSCALE_SETAUTOTICKS">
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 LinearScale::SetAutoTicks()</A> you tell JpGraph to make the smallest
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 necessary adjustment of the end/start points so that they fall on an
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 exact tick mark.</LI>
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<LI> Manually specify the tick marks with a call to <A href="../ref/LinearTicks.html#_LINEARTICKS_SET">
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 LinearTicks::Set()</A> For example<DIV class="phpscript"><CODE><FONT color="#000000">
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 <FONT color="#0000BB">&nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
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color="#0000BB">SetScale</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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&quot;textlin&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">0</FONT><FONT
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color="#007700">,</FONT><FONT color="#0000BB">100</FONT><FONT color="#007700">
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);
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
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color="#0000BB">yscale</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
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ticks</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">Set</FONT><FONT
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color="#007700">(</FONT><FONT color="#0000BB">10</FONT><FONT color="#007700">
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,</FONT><FONT color="#0000BB">5</FONT><FONT color="#007700">);</FONT><FONT
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color="#0000BB"></FONT></FONT></CODE></DIV>
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<P>Will set the major tick marks every at 0,10,20,.. And every minor
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 tick mark in between (0,5,10,15,20,25,...).</P>
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</LI>
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</OL>
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<P> The three images below illustrates the difference between the
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 possibilities of ticks for a manual scale.<DIV class="example">
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<BR> <A href="exframes/frame_manscaleex1.html" target="blank"><IMG border="0"
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HEIGHT="200"       src="img/img/img/img/img/img/manscaleex1.png" WIDTH="220"></A>
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<BR><B>Figure 76:</B> Manual scale, manual ticks major=7 minor=2 <A href="exframes/frame_manscaleex1.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P></P>
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<P><DIV class="example">
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<BR> <A href="exframes/frame_manscaleex4.html" target="blank"><IMG border="0"
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HEIGHT="200"       src="img/img/img/img/img/img/manscaleex4.png" WIDTH="220"></A>
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<BR><B>Figure 77:</B> Manual scale, automatic ticks with exact limits <A href="exframes/frame_manscaleex4.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P></P>
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<P><DIV class="example">
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<BR> <A href="exframes/frame_manscaleex2.html" target="blank"><IMG border="0"
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HEIGHT="200"       src="img/img/img/img/img/img/manscaleex2.png" WIDTH="220"></A>
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<BR><B>Figure 78:</B> Manual scale, automatic ticks where we allow
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 adjustments of the limits <A href="exframes/frame_manscaleex2.html" target="blank">
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[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P></P>
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