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<H2><A NAME="8_8">8.8 Specifying the scale manually</A></H2>
<P> Normally the automatic scaling should be doing an adequate job in
 most circumstances but there might be cases where you like to manually
 set the scale. For example if you have several graphs where you like to
 be able to easily compare them and therefore want them all to have the
 same scale.</P>
<P> To specify a manual scale you have to add arguments to the standard <A
href="../ref/Graph.html#_GRAPH_SETSCALE"> Graph::SetScale()</A> method.
 So to specify that you want an Y-scale between 0 and 100 you need to
 write<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
SetScale</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;textlin&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">0</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">100</FONT><FONT color="#007700">
);</FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV></P>
<P>When you specify a scale manually there is one additional thing you
 need to decide. How the tick marks should be positioned. You have three
 choices</P>
<OL>
<LI> Let JpGraph decide suitable tick marks honoring the exact scale you
 specified.<B> This is the default behavior</B> if you don't do anything
 else.</LI>
<LI> Allow JpGraph to slightly adjust your specified min and max values.
 With the default method, depending on the min and max values, the end
 and start of the scale might not fall on an exact tick mark. For
 esthetic reasons you might still want the last/first tick mark to fall
 on the edges of the scale. By calling <A href="../ref/LinearScale.html#_LINEARSCALE_SETAUTOTICKS">
 LinearScale::SetAutoTicks()</A> you tell JpGraph to make the smallest
 necessary adjustment of the end/start points so that they fall on an
 exact tick mark.</LI>
<LI> Manually specify the tick marks with a call to <A href="../ref/LinearTicks.html#_LINEARTICKS_SET">
 LinearTicks::Set()</A> For example<DIV class="phpscript"><CODE><FONT color="#000000">
 <FONT color="#0000BB">&nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">SetScale</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;textlin&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">0</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">100</FONT><FONT color="#007700">
);
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">yscale</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
ticks</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">Set</FONT><FONT
color="#007700">(</FONT><FONT color="#0000BB">10</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">5</FONT><FONT color="#007700">);</FONT><FONT
color="#0000BB"></FONT></FONT></CODE></DIV>
<P>Will set the major tick marks every at 0,10,20,.. And every minor
 tick mark in between (0,5,10,15,20,25,...).</P>
</LI>
</OL>
<P> The three images below illustrates the difference between the
 possibilities of ticks for a manual scale.<DIV class="example">
<BR> <A href="exframes/frame_manscaleex1.html" target="blank"><IMG border="0"
HEIGHT="200"  src="img/manscaleex1.png" WIDTH="220"></A>
<BR><B>Figure 72:</B> Manual scale, manual ticks major=7 minor=2 <A href="exframes/frame_manscaleex1.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
<P><DIV class="example">
<BR> <A href="exframes/frame_manscaleex4.html" target="blank"><IMG border="0"
HEIGHT="200"  src="img/manscaleex4.png" WIDTH="220"></A>
<BR><B>Figure 73:</B> Manual scale, automatic ticks with exact limits <A href="exframes/frame_manscaleex4.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
<P><DIV class="example">
<BR> <A href="exframes/frame_manscaleex2.html" target="blank"><IMG border="0"
HEIGHT="200"  src="img/manscaleex2.png" WIDTH="220"></A>
<BR><B>Figure 74:</B> Manual scale, automatic ticks where we allow
 adjustments of the limits <A href="exframes/frame_manscaleex2.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
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