Add new doc directory and v520 release notes

git-svn-id: http://root.cern.ch/svn/root/trunk@23580 27541ba8-7e3a-0410-8455-c3a389f83636

graf2d/doc/v520.html

+
+<br>
+<hr>
+<h3>TASImage - libAfterImage library</h3>
+
+<h4>TASImage</h4>
+<ul>
+<li> Protection added in DrawCircle. Problem seen with gcc version 4.2.3.
+
+<li> Fixed byte swapping issues.
+With that fix the pictures generated in batch mode on Solaris and
+Mac are now correct (cf stressGraphics -k).
+<li> The Alpha Blending code has been rewritten in a simpler way in
+order to work on linux
+with gcc 4.2.3. Here also the pictures generated in batch mode
+were wrong.
+<li> In FillRectangleInternal when the rectangle to be drawn had
+its width or its height equal to 0, they were set to the current image width ot
+height. This
+was not a good solution because this obscured completly the
+picture. In
+particular, some markers being drawn with a filled rectangle,
+they obscured
+the picture when that were really small because in that case the
+rectangle
+drawn had width=height=0. Now, when a rectangle has its width or
+height
+equal to 0 it is set to 1 (pixel) with makes sense because &quot;0&quot;
+means tiny not
+huge ...
+</ul>
+
+<h4>libAfterImage</h4>
+<ul>
+<li>
+There no need anymore for the special version we had up to now.
+The modifications we needed have been introduced in the official
+version.
+<p>
+This version also fixes the color problem on BigEndian machines.
+On these machines
+(Mac and Solaris for instance) the color of the jpeg and png
+images saved from the
+&quot;File&quot; menu in a TCanvas were completely wrong.
+</ul>
+
+
+
+<h3>Graphical Output</h3>
+<h4>PDF</h4>
+<ul>
+<li> Text rotated at 270 degrees was not correct. The PDF rotation matrix 
+     contained very small values close to 0 instead of 0. Acrobat reader
+     produced a wrong output and also printed result was wrong.
+     &quot;gv&quot; worked.
+</ul>
+<h4>PostScript</h4>
+<ul>
+<li> The character &quot;@&quot; could not be printed in PostScript files.
+<li> Change the Page numbering to make it appear nicer in postcript viewers
+     like gv. It is compliant with the Adobe Postscript Document
+     Structuring Conventions (easily found on the web).
+</ul>
+
+
+<h3>TPad</h3>
+<ul>
+<li> In batch mode it was not possible to generate a bitmap file (gif,
+     jpeg etc..) with a filename containing &quot;)&quot;, &quot;(&quot;, &quot;]&quot; or &quot;[&quot;.
+<li> The Tickx and Tixky attributes were not saved properly by SavePrimitive.
+<li> PaintPolyLineNDC was not working in case of PS output.
+<li> In ExecuteEvent. A problem was found Mathieu de Naurois &lt;denauroi@in2p3.fr&gt;.
+     It can be reproduced by the following sequence:
+     <ol>
+     <li> do TCanvas c
+     <li> do c-&gt;Divide(2,2)
+     <li> show the toolbar
+     <li> click L to enter text
+     <li> click on a pad to enter text
+     <li> move the mouse without releasing the button.
+     <li> entex text
+     <li> hit Enter.
+     </ol>
+     Before this bug fix, the canvas position changed on &quot;hit Enter&quot;.
+<li> On a Windows dual core machine, the WaitPrimitive call returned
+     immediately.
+</ul>
+
+
+<h3>Miscellaneous</h3>
+
+<h4>TView3D</h4>
+Protection was missing in ctors in case gPad does not exits.
+
+<h4>TMultiGraph</h4>
+<ul>
+<p><li> Joining two multigraphs using <tt>In TMultiGraph::Add(TMultiGraph*,Option_t *)</tt>
+        method issued the error:
+        <pre>
+        Error in <TList::AddLast>: argument is a null pointer
+        </pre>
+        Despite of the message the joined multigraph was correct.
+        Internally the loop on the input multigraph was one step too long.
+<p><li> Implement the fit parameters painting.
+</ul>
+
+
+<h4>Histograms painting with option BOX</h4>
+<ul>
+<li> For 2D histograms, when all the bins' contents were negative, the boxes
+     were not painted correctly.
+<li> For 3D histograms painted using OpenGL (drawing options "glbox" and 
+     "glbox1") a minus sign on negative bins is added in order to  
+     distinguish them from positive bins.
+</ul>
+
+<h4>TGraph2D</h4>
+The operator "=" was not correct.
+
+<h4>TPie</h4>
+Add the <tt>TPie::GetEntries()</tt> method that return the number slices.
+(Guido Volpi)
+
+<h4>TPaletteAxis</h4>
+Attributes are now accessible in the context menu.
+(requested by Mathieu de Naurois &lt;denauroi@in2p3.fr&gt;)
+
+
+<h4>TPolyLine</h4>
+Implement the possibility to draw TPolyLine in NDC coordinates
+(it was partially done but the code was not used).
+
+<h4>Documentation</h4>
+<ul>
+<li> Better comments in THelix. 
+<li> Option &quot;FUNC&quot; was not documented in THistPainter..
+<li> Update the help for animated gif generation in TPad.
+</ul>
+
+
+<h4>TCutG</h4>
+The graphical cuts applied on histograms did not work when the cut name
+contained a mix of lower and upper case characters. This problem occured because
+the option used to draw an histogram was always converted into lower case before
+begin stored in a pad (in Draw and DrawCopy). Now in Draw() and DrawCopy() the
+AppendPad() procedure is called with the option string not converted in lower
+case.
+