visible when drawing Feymann diagrams.


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TGraph2D is now split into 3 classes:

- TGraph2D (now in hist) to handle the basic graph 2d data
- TGraphDelaunay (in hist) to generate a Delaunay triangulation of a TGraph2D.
- TGraphPainter (in histpainter) to paint a TGraphDelaunay (used via
  THistPainter)
- New function GetContourList in TGraph2D
- New option CONT5: draws a TGraph2D as a contour (using Delaunay
  triangles).
- New TGraph2D constructor (from a TH2).

The class TSpectrum2 has been removed (still waiting for fixes from Miroslav)

NOTE: it is recommended to make distclean  make
or at least
 rm hist/src/G*  graph/src/G*


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functions by an explicit loop to take into account the case of the same
object (with different drawing options) being added to the same list.
This, in principle, should be covered by the "slow" option in TList::Delete,
but the logic does not work. To be revesited!


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Leave more space between labels when the option MoreLogLabels is on


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    Depending on number of bins, fHistogram's maximum and minimum
    can be different from the data set minimum and maximum


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By default the option is "alp" and can be modified by:
  adding a line with TGraph.BrowseOption:  myoption
  calling gEnv->SetValue("TGraph.BrowseOption",myoption)


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behaviour is now to clear the pad.


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the pavelabel border size


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of a variable inside a switch block


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- New plotting options:
   "TRI1" : The Delaunay triangles are painted with color levels. The
            edges of each triangles are painted with the current line
            color.
   "TRI2" : the Delaunay triangles are painted with color levels.
- New method: PaintPolyMarker0. Used in PaintTriangles.


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From Damir and Olivier:

Correct a few remaining problems for time axis. Now, the time stored in
the format is always expressed in UTC. The local time is calculated
only at display time if the "gmt" option of SetTimeOffset is not used.
This allows to send a plot to someone in another time zone without
discrepancies on the time displayed.
If the plot uses "gmt", it will always show the same, whatever time
zone. If not, the time displayed will be the one local to the
displaying machine.


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New class TGraph2DErrors, deriving from TGraph2D and implementing
errors in x,y and z.
An example of this class is given in the new tutorial graph2derrorsfit.C


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- Paint the grid levels on the triangles along the Z axis
- Option P  : draw a marker at each vertex
- Option P0 : draw a circle at each vertex. Each circle background is
  white
- Mods in Fit (needed by TGraph2DErrors)
- New virtual methods to get the errors (needed by TGraph2DErrors)


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Implement suggestion from Damir Buskulic:

- Take into account the decimal part of the time offset.
- New parameter "option" in SetTimeOffset. Default value is "local"
  meaning the time offset should be consider as a local time. It can
  be set to "gmt" meaning the time offset should be consider as GMT time.


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Fix a problem in the axis time management when the time offset
has a crazy value.


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instead of the hardwired value 1.


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The option is dummy. It is introduced for consistency with
other high level classes (TH1, TTree). It eliminates
the problem with the native option "a" of TGraph.


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 - The author line has been modified to make sure all the authors appear
   in the HTML page.
 - More comments.
 - MaxTries changed to MaxIter.


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- Delaunay triangles are stored in dynamic arrays. In the previous
  versions the maximum number of triangles was 1000. There is no hard
  coded limit now.
- More documentation (Definition of Delaunay triangulation)
- New constructors from floats and ints arrays.
- New constructor with name and title (from doubles arrays only)
- Copy constructor
- Operator "="
- Do not store fHistogram in the current directory
- TGraph2D objects are stored in the current directory
- Do not try to perform a triangulation if it is not needed. For
  instance when the graph is drawn with markers only.
- New method SetDirectory
- New method SetName
- New method SetMaxTries: Defines the number of triangles tested for a
  Delaunay's triangle before abandoning the search
- Method TriEncode removed
- Custom Streamer implemented (setting fDirectory in input)


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lin and log scales for basic types.
TLegend::PaintPrimitives has been modified in consequence.


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TGraph2D:
 - New method FindAllTriangles (it finds all the Delaunay's triangles).
 - PaintTriangles handles the paint option TRI, W, and P.
 - fNpoints is initialized on the ctors declaration line.
 - The triangles painting takes care of log options and of the min and
   max values.
 - PaintTriangles uses the new THistPainter's method PaintAxis3D to paint
   the 3D axis.

THistPainter:
 - Option "axis" works on 2D histograms.
 - New method PaintAxis3D to paint the 3D axis.


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In Graph2D:

- A more complete example (fitting)
- Constructor from a file name
- New method Interpolate
- New method FindObject
- Fitting
- New method GetHistogram.
- New method RemovePoint
- New methods SetMaximum and SetMinimum
- plus many improvements ...

In TFitter:

- Necessary changes to support Graph2D fitting


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the argument option is null.


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polyline. In this case the object is picked when the mouse is inside
the polygone, otherwise the object is picked only when the mouse is closed
to one of lines of the polyline.


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- The vectors fX fY and fZ are not changed (normalized) as before.
- New methods to retrieve the Min and Max of fX and fY.
- SavePrimitive implemented.
- New constructors TGraph2D() and TGraph2D(n).
- New method Initialise used by all constructors.
- New method SetPoint to fill the internal arrays.
- Better help (with an example).


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This class is a set of N points x[i],y[i],zi[i] in a non uniform grid.
Several visualisation techniques are implemented, includind Delaunay triangulation.
This new class is great and an important addition to ROOT.


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The corresponding primitives can be drawn in a pad in linear scale
and one can toggle the lin/log scales.


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of the TF1 object to the TGraph object.


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the default arguments arrowsize and option are specified.


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in the graph is null.


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from 1 to the true default 0.05


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