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<HR NOSHADE>
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<H3><A NAME="7_1_10">7.1.10 Adjusting the grid lines in the plot</A></H3>
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<P> By default only the Y-axis have grid lines and then only on major
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ticks, i.e. ticks which have a label. It is of course possible to
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change this. Both the X , Y and Y2 can have grid lines. It is also
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possible to let the gridlines also be drawn on the minor tick marks,
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i.e. ticks without a label. Lets see how we can apply this to the graph
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above.</P>
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<P> The grid is modified by accessing the xgrid (or ygrid) component of
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the graph. So to display minor grid lines for the Y graph we make the
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call<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
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$graph</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">ygrid</FONT><FONT
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color="#007700">-></FONT><FONT color="#0000BB">Show</FONT><FONT color="#007700">
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(</FONT><FONT color="#0000BB">true</FONT><FONT color="#007700">,</FONT><FONT
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color="#0000BB">true</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB">
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</FONT></FONT></CODE></DIV></P>
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<P> The first parameter determines if the grid should be displayed at
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all and the second parameter determines whether or not the minor grid
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lines should be displayed.</P>
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<P> If you also wanted the grid lines to be displayed for the Y2 axis
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you would call<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
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$graph</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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y2grid</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">Show</FONT><FONT
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color="#007700">(</FONT><FONT color="#0000BB">true</FONT><FONT color="#007700">
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,</FONT><FONT color="#0000BB">true</FONT><FONT color="#007700">)</FONT><FONT
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color="#0000BB"></FONT></FONT></CODE></DIV></P>
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<P><STRONG> Note.</STRONG> In general it is not a good idea to display
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both the Y and Y2 grid lines since the resulting image becomes
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difficult to read for a viewer.</P>
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<P> We can also enable the X-grid lines with the call<DIV class="phpscript">
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<CODE><FONT color="#000000"> <FONT color="#0000BB"> $graph</FONT><FONT color="#007700">
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-></FONT><FONT color="#0000BB">xgrid</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">Show</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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true</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT></FONT>
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</CODE></DIV></P>
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<P></P>
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<P> In the above line we will of course only just enable the major grid
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lines.</P>
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<P> To bring all this together we will display a graph with grid lines
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for both Y and X axis enabled.<DIV class="example">
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<BR> <A href="exframes/frame_example8.html" target="blank"><IMG border="0"
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HEIGHT="200" src="img/img/img/img/img/img/example8.png" WIDTH="350"></A>
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<BR><B>Figure 20:</B> Enabling major and minor gridlines for Y-axis and
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major grid lines for the X-axis <A href="exframes/frame_example8.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><DIV class="note"><B>Note:</B> If you think the first value of the
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Y-axis is to close to the first label of the X-axis you have the option
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of either increasing the margin (with a call to <A href="../ref/Axis.html#_AXIS_SETLABELMARGIN">
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SetLabelMargin()</A> ) or to hide the first label (with a call to <A href="../ref/Axis.html#_AXIS_HIDEFIRSTTICKLABEL">
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HideFirstTickLabel()</A> )</DIV></P>
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