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  28  <H3><A NAME="3_1_2">3.1.2 Verifying that you have GD2 installed</A></H3>
  29  <P> To access the more advanced features of JpGraph needs the GD 2.x
  30   library. This will allow the use of features such as alpha-blending and
  31   trucolor images.</P>
  32  <P> The GD 2.x library is included in all standard PHP versions from
  33   4.2.x and above. To make sure that the GD 2.x library is installed the
  34   following script must be working.<DIV class="phpscript"><CODE><FONT color="#000000">
  35   <FONT color="#0000BB">&nbsp;$im&nbsp;</FONT><FONT color="#007700">=&nbsp;</FONT><FONT color="#0000BB">
  36  imagecreatetruecolor&nbsp;</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
  37  300</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">200</FONT><FONT
  38  color="#007700">);&nbsp;
  39  <BR></FONT><FONT color="#0000BB">$black&nbsp;</FONT><FONT color="#007700">=&nbsp;</FONT><FONT
  40  color="#0000BB">imagecolorallocate&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
  41  color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
  42  0</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">0</FONT><FONT
  43  color="#007700">,&nbsp;</FONT><FONT color="#0000BB">0</FONT><FONT color="#007700">
  44  );&nbsp;
  45  <BR></FONT><FONT color="#0000BB">$white&nbsp;</FONT><FONT color="#007700">=&nbsp;</FONT><FONT
  46  color="#0000BB">imagecolorallocate&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
  47  color="#0000BB">$im</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">
  48  255</FONT><FONT color="#007700">,&nbsp;</FONT><FONT color="#0000BB">255</FONT><FONT
  49  color="#007700">,&nbsp;</FONT><FONT color="#0000BB">255</FONT><FONT color="#007700">
  50  );&nbsp;
  51  <BR>
  52  <BR></FONT><FONT color="#0000BB">imagefilledrectangle</FONT><FONT color="#007700">
  53  (</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,</FONT><FONT
  54  color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
  55  0</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">399</FONT><FONT
  56  color="#007700">,</FONT><FONT color="#0000BB">99</FONT><FONT color="#007700">
  57  ,</FONT><FONT color="#0000BB">$white</FONT><FONT color="#007700">);&nbsp;
  58  <BR></FONT><FONT color="#0000BB">imagerectangle</FONT><FONT color="#007700">
  59  (</FONT><FONT color="#0000BB">$im</FONT><FONT color="#007700">,</FONT><FONT
  60  color="#0000BB">20</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
  61  20</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">250</FONT><FONT
  62  color="#007700">,</FONT><FONT color="#0000BB">190</FONT><FONT color="#007700">
  63  ,</FONT><FONT color="#0000BB">$black</FONT><FONT color="#007700">);&nbsp;
  64  <BR>
  65  <BR></FONT><FONT color="#0000BB">header&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
  66  color="#DD0000">&quot;Content-type:&nbsp;image/png&quot;</FONT><FONT color="#007700">
  67  );&nbsp;
  68  <BR></FONT><FONT color="#0000BB">imagepng&nbsp;</FONT><FONT color="#007700">(</FONT><FONT
  69  color="#0000BB">$im</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB">
  70  </FONT></FONT></CODE></DIV></P>
  71  <P> After running this script you should now see a black rectangle in
  72   your browser.</P>
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