Hi,
I have recently implemented this in TGraph. See
$ROOTSYS/tutorials/graphpolar.C
This has been introduced in the last ROOT release. See:
http://root.cern.ch/root/Version511.news.html
Cheers, Olivier Couet
-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch
[mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Alexander Wagner
Sent: Wednesday, June 07, 2006 5:13 PM
To: Roottalk
Subject: [ROOT] Filling area under a curve
Hi!
In some of my plots I want to show an excluded area by just shading it in gray. To this end I tried the following
TH2F *Shade = new TH2F("excl", "", xbins, xmin, xmax, ybins, ymin, ymax);
for( Double_t x = xmin; x < xmax; x += (xmax-xmin)/xbins) {
for(Double_t y = ymin; y < ymax; y += (ymax-ymin)/ybins) { val = curve(y, x); if (val <= excl) { Shade->SetBinContent( Shade->FindBin(x,y), 500);
}
else { Shade->SetBinContent( Shade->FindBin(x,y), 0);
}
}
Shade->SetContour(1, contours); Shade->Draw("cont4"); ----------------------------------------------------------------------
Now, unfortunately root fills the area _above_ the curve in black (I did not even find how to change that colour) and not the one below. I always get it displayed in white, wheras I'd like something like gray70. Actually the area above the curve should be transparent so that I could Draw("cont4,same"), above another graph. Searching arround did not give me a clue (though I came accros some other interesting things ;)
Does anybody have a hint how to do this?
Many thanks in advance!
(Running root 5.10/00 @debian sarge.)
-- Kind regards, / War is Peace. | Freedom is Slavery. Alexander Wagner | Ignorance is Strength. | | Theory : G. Orwell, "1984" / In practice: USA, since 2001Received on Wed Jun 07 2006 - 17:36:47 MEST
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