Old -> new color scheme for root v5.16

ROOT
1

Hi,

is there any function to calculate the new color index n>300 out of the old color index (1-200)?
My problem is, that the colors that are bright or dark (+100/+150) are not displayed correctly in the new root version.

e.g. Some of my objects where filled with 188 (bright blue) and appear white in the new root version.

Cheers Markus

2

see 5.16 release notes (new TColorWheel) at root.cern.ch/root/Version516.news.html

Rene

3

Hi Rene,

yes I know the TColorWheel. I just wanted to update all my colors automatically and have exactly the same colors (not finding a similar color in the wheel).

I also used this functionality to get the bright colors. Just a small example which I do not understand:

TH1F* h=new TH1F(“h”,“h”,10,0,10)
h->Fill(3)
h->SetFillColor(188)
h->Draw()

histogram is white (which makes sense if only the new colors >300 are supported, in old root version it was bright blue)

TColor::GetColorBright(38)

histogram gets bright blue after clicking on it, or redrawing the histogram

Do I have to call this function GetColorBright(n) to define the color for each n?

Cheers Markus

4

With the new schema kBlue gives the plain blue
kBlue+1, kBlue+2, kBlue+3, kBlue+4
give darker blues and
KBlue-1 etc … lighter blues

I do not know if that answer your question …

5

Not really,

I just included now the following line in the file where I defined my colors:

TColor::GetColorBright(n);

where n is my old (bright color) -150

e.g after TColor::GetColorBright(38);
the color 188 is defined again.

I am not sure why, but it works…

Markus