[Sommaire] [Imprimer]

   1  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
   2  <HTML>
   3  <HEAD>
   4  <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=iso-iso-8859-1">
   5  <LINK REL="Start" HREF="index.html">
   6  <LINK REL="Contents" HREF="toc.html">
   7  <LINK REL="Prev" HREF="819Moreonscales.html">
   8  <LINK REL="Next" HREF="8111Usingfilledgridlines.html">
   9  <STYLE TYPE="text/css"><!--
  10  BODY { font-family: serif }
  11  H1 { font-family: sans-serif }
  12  H2 { font-family: sans-serif }
  13  H3 { font-family: sans-serif }
  14  H4 { font-family: sans-serif }
  15  H5 { font-family: sans-serif }
  16  H6 { font-family: sans-serif }
  17  SUB { font-size: smaller }
  18  SUP { font-size: smaller }
  19  PRE { font-family: monospace }
  20  A { text-decoration: none }
  21  --></STYLE>
  22  </HEAD>
  23  <BODY>
  24  <A HREF="toc.html">Contents</A>
  25  <A HREF="819Moreonscales.html">Previous</A>
  26  <A HREF="8111Usingfilledgridlines.html">Next</A>
  27  <HR NOSHADE>
  28  <H3><A NAME="8_1_10">8.1.10 Adjusting the grid lines in the plot</A></H3>
  29  <P> By default only the Y-axis have grid lines and then only on major
  30   ticks, i.e. ticks which have a label. It is of course possible to
  31   change this. Both the X , Y and Y2 can have grid lines. It is also
  32   possible to let the gridlines also be drawn on the minor tick marks,
  33   i.e. ticks without a label. Lets see how we can apply this to the graph
  34   above.</P>
  35  <P> The grid is modified by accessing the xgrid (or ygrid) component of
  36   the graph. So to display minor grid lines for the Y graph we make the
  37   call<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  38  &nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">ygrid</FONT><FONT
  39  color="#007700">-&gt;</FONT><FONT color="#0000BB">Show</FONT><FONT color="#007700">
  40  (</FONT><FONT color="#0000BB">true</FONT><FONT color="#007700">,</FONT><FONT
  41  color="#0000BB">true</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB">
  42  </FONT></FONT></CODE></DIV></P>
  43  <P> The first parameter determines if the grid should be displayed at
  44   all and the second parameter determines whether or not the minor grid
  45   lines should be displayed.</P>
  46  <P> If you also wanted the grid lines to be displayed for the Y2 axis
  47   you would call<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  48  &nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
  49  y2grid</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">Show</FONT><FONT
  50  color="#007700">(</FONT><FONT color="#0000BB">true</FONT><FONT color="#007700">
  51  ,</FONT><FONT color="#0000BB">true</FONT><FONT color="#007700">)</FONT><FONT
  52  color="#0000BB"></FONT></FONT></CODE></DIV></P>
  53  <P><STRONG> Note.</STRONG> In general it is not a good idea to display
  54   both the Y and Y2 grid lines since the resulting image becomes
  55   difficult to read for a viewer.</P>
  56  <P> We can also enable the X-grid lines with the call<DIV class="phpscript">
  57  <CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$graph</FONT><FONT color="#007700">
  58  -&gt;</FONT><FONT color="#0000BB">xgrid</FONT><FONT color="#007700">-&gt;</FONT><FONT
  59  color="#0000BB">Show</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  60  true</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT></FONT>
  61  </CODE></DIV></P>
  62  <P></P>
  63  <P> In the above line we will of course only just enable the major grid
  64   lines.</P>
  65  <P> To bring all this together we will display a graph with grid lines
  66   for both Y and X axis enabled.<DIV class="example">
  67  <BR> <A href="exframes/frame_example8.html" target="blank"><IMG border="0"
  68  HEIGHT="200"  src="img/example8.png" WIDTH="350"></A>
  69  <BR><B>Figure 18:</B> Enabling major and minor gridlines for Y-axis and
  70   major grid lines for the X-axis <A href="exframes/frame_example8.html" target="blank">
  71  [src]</A>&nbsp;
  72  <P></P>
  73  </DIV></P>
  74  <P><DIV class="note"><B>Note:</B> If you think the first value of the
  75   Y-axis is to close to the first label of the X-axis you have the option
  76   of either increasing the margin (with a call to <A href="../ref/Axis.html#_AXIS_SETLABELMARGIN">
  77   SetLabelMargin()</A> ) or to hide the first label (with a call to <A href="../ref/Axis.html#_AXIS_HIDEFIRSTTICKLABEL">
  78   HideFirstTickLabel()</A> )</DIV></P>
  79  <HR NOSHADE>
  80  <A HREF="toc.html">Contents</A>
  81  <A HREF="819Moreonscales.html">Previous</A>
  82  <A HREF="8111Usingfilledgridlines.html">Next</A>
  83  </BODY>
  84  </HTML>