TPDF

git-svn-id: http://root.cern.ch/svn/root/trunk@43506 27541ba8-7e3a-0410-8455-c3a389f83636

graf2d/doc/v534/index.html

@@ -16,6 +16,24 @@
    <li>
       Better sizes matching with the screen output for markers 6 and 7 (dots).
    </li>
+   <li>
+      Implement the transparency in PDF files. To make a graphics object transparent
+      it is enough to set its color to a transparent one. The color transparency
+      is defined via its alpha component. The alpha value varies from 0. to 1. 
+      0. makes an object fully transparent, and 1. makes it fully opaque. To set the
+      alpha value of an existing color it is enough to do:
+      <pre>
+         TColor *col26 = gROOT->GetColor(26);
+         col26->SetAlpha(0.01);
+      </pre>
+      A new color can be created transparent the following way:
+      <pre>
+         Int_t ci = 1756;
+         TColor *color = new TColor(ci, 0.1, 0.2, 0.3, 0.5); // alpha = 0.5
+      </pre>
+      An example of tranparency usage with parallel coordinates can be found
+      in <tt>$ROOTSYS/tutorials/tree/parallelcoordtrans.C</tt>
+   </li>
 </ul>
 
 <h4>TLegend</h4>