Hi all,
I was just switching from an older version of ROOT (3.00/06) to the newest
3.03/09 and noticed that the color scale on COLZ plots is different: Less
than the 50 colors of the gSystem->SetPalette(1) default are used.
I found the reason for this change to be the introduction of contour levels.
My histograms do not have contour levels set, so the default of 20 levels.
I know you can change in the TH* itself, but this is very inconvenient
for e.g. tree->Draw("...") or TBrowser draw selections as a new histogram
is created each time.
It would be nice to either have that default number configurable
(e.g. gSystem->SetDefaultNumberContourLevels()) or to change with
the number of colors in the color palette, i.e. change the lines
in THistPainter.cxx void THistPainter::PaintColorLevels(Option_t *)
from
// Initialize the levels on the Z axis
Int_t ncolors = gStyle->GetNumberOfColors();
Int_t ndiv = fH->GetContour();
if (ndiv == 0 ) {
ndiv = 20;
fH->SetContour(ndiv);
}
to
// Initialize the levels on the Z axis
Int_t ncolors = gStyle->GetNumberOfColors();
Int_t ndiv = fH->GetContour();
if (ndiv == 0 ) {
ndiv = ncolors;
if (ndiv <= 0 ) ndiv=20;
fH->SetContour(ndiv);
}
Ciao
Thomas
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Thomas Hadig MS 62, 2575 Sand Hill Road, Menlo Park CA 94025, USA
hadig@slac.stanford.edu Tel.: +1 650 926 2810
http://www.slac.stanford.edu/~hadig/
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