[Sommaire] [Imprimer]

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  28  <H3><A NAME="4_8_1">4.8.1 Adjusting the transparency</A></H3>
  29  <P> From version 1.10 JpGraph also supports the use of Alpha Blending
  30   together with GD2.x This lets you specify how much of the underlying
  31   color should be visible. You specify the amount of transparency for a
  32   color by adding an extra parameter to the color specification separated
  33   by an '@' (at) character.</P>
  34  <P> For example to specify a red color which is 40% transparent you
  35   write<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
  36  &nbsp;SetColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
  37  &quot;red@0.4&quot;</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
  38  </FONT></CODE></DIV></P>
  39  <P> or to specify 90% transparancy you write<DIV class="phpscript"><CODE>
  40  <FONT color="#000000"> <FONT color="#0000BB">&nbsp;SetColor</FONT><FONT color="#007700">
  41  (</FONT><FONT color="#DD0000">&quot;red@0.9&quot;</FONT><FONT color="#007700">);</FONT><FONT
  42  color="#0000BB"></FONT></FONT></CODE></DIV></P>
  43  <P> Below is an example of how a bar graph with a background image can
  44   make use of transparency
  45  <!--?
  46  Example('alphabarex1','Using alpha blending in a bar graph');
  47  ?-->
  48  </P>
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