Hi all,
I do the TH2C histogram that is in attach.
Now the numbers on Y axis are too many, I want 0, 4, 8,… but I want the grid for every number (0,1,2,3,4…).
How should I do?
I use, for the grid, the code:
TCanvas *c1 = new TCanvas("c1","Visualizzazione",10,10,1000,500);
c1->SetGrid();
TH2C *h100 = new TH2C("h100","Visualizzazione",32,0.,32.,64,0.,64.);
h100->GetXaxis()->SetNdivisions(32);
h100->GetYaxis()->SetNdivisions(64); Thanks
Ciccio
{
gStyle->SetOptStat(0);
TCanvas *c1 = new TCanvas("c1","Visualizzazione",10,10,1000,500);
TH2C *h100 = new TH2C("h100","Visualizzazione",32,0.,32.,64,0.,64.);
h100->GetXaxis()->SetNdivisions(32);
h100->GetYaxis()->SetNdivisions(16);
h100->Draw();
TPad *grid = new TPad("grid","",0,0,1,1);
grid->Draw();
grid->cd();
grid->SetGrid();
grid->SetFillStyle(4000);
TH2 *hgrid = new TH2C("hgrid","",32,0.,32.,64,0.,64.);
hgrid->Draw();
hgrid->GetXaxis()->SetNdivisions(32);
hgrid->GetYaxis()->SetNdivisions(64);
hgrid->GetYaxis()->SetLabelOffset(999.);
hgrid->GetXaxis()->SetLabelOffset(999.);
}Hi cout,
thank you for the answer, but now I don’t understand why I fill the histogram the grid don’t appears.
I attach the plot.
the code is:
TCanvas *c1 = new TCanvas("c1","Visualizzazione",10,10,1000,500);
gStyle->SetOptStat(0);
TFile *f = new TFile("visualizzazione.root","RECREATE");
TH2C *h100 = new TH2C("h100","Visualizzazione",32,0.,32.,64,0.,64.);
h100->GetXaxis()->SetNdivisions(32);
h100->GetYaxis()->SetNdivisions(16);
h100->SetFillColor(3);
// h100->Draw();
TPad *grid = new TPad("grid","",0,0,1,1);
grid->Draw();
grid->cd();
grid->SetGrid();
grid->SetFillStyle(4000);
TH2C *hgrid = new TH2C("hgrid","",32,0.,32.,64,0.,64.);
hgrid->GetXaxis()->SetNdivisions(32);
hgrid->GetYaxis()->SetNdivisions(64);
hgrid->GetYaxis()->SetLabelOffset(999.);
hgrid->GetXaxis()->SetLabelOffset(999.);
hgrid->Draw();
.......
h100->Draw("BOX");
hgrid->Draw("SAME");
thanks
Ciccio
the grid is drawn in a transparent separated pad you should draw it after the histogram as I did in my 1st example.
Sorry I don’t understad.
Could you write the code, please?
Set me your macro which fill the histogram.
I attach the files that I use.
thanks
ciccio
visualizzazione.C (2.69 KB)
conversione.h (851 Bytes)
I do not have : visualizzazione.root
Sorry it is created n your macro … When I run your macro it crashes
Ok, don’t worry
thant you for all
Ciccio
So we consider this item as solved ?
No solved, but suspended
I continue to work and when I will solve it I will write the solution
thanks
Ciccio
That quite simple. The code whcih draw the grid is:
TPad *grid = new TPad("grid","",0,0,1,1);
grid->Draw();
grid->cd();
grid->SetGrid();
grid->SetFillStyle(4000);
TH2 *hgrid = new TH2C("hgrid","",32,0.,32.,64,0.,64.);
hgrid->Draw();
hgrid->GetXaxis()->SetNdivisions(32);
hgrid->GetYaxis()->SetNdivisions(64);
hgrid->GetYaxis()->SetLabelOffset(999.);
hgrid->GetXaxis()->SetLabelOffset(999.); It should be put after all the histogram drawings. And the histograms should be drawn without grid. This code you can even put in a function PaintGrid() and call it after all the histogram drawings.
[quote=“couet”]That quite simple. The code whcih draw the grid is:
TPad *grid = new TPad("grid","",0,0,1,1);
grid->Draw();
grid->cd();
grid->SetGrid();
grid->SetFillStyle(4000);
TH2 *hgrid = new TH2C("hgrid","",32,0.,32.,64,0.,64.);
hgrid->Draw();
hgrid->GetXaxis()->SetNdivisions(32);
hgrid->GetYaxis()->SetNdivisions(64);
hgrid->GetYaxis()->SetLabelOffset(999.);
hgrid->GetXaxis()->SetLabelOffset(999.); It should be put after all the histogram drawings. And the histograms should be drawn without grid. This code you can even put in a function PaintGrid() and call it after all the histogram drawings.[/quote]
I do it.
the last code rows are:
h100->Draw("BOX");
// grid->Draw();
// hgrid->Draw();
TPad *grid = new TPad("grid","",0,0,1,1);
grid->Draw("SAME");
grid->cd();
grid->SetGrid();
grid->SetFillStyle(4000);
TH2C *hgrid = new TH2C("hgrid","",32,0.,32.,64,0.,64.);
hgrid->Draw("SAME");
hgrid->GetXaxis()->SetNdivisions(32);
hgrid->GetYaxis()->SetNdivisions(64);
hgrid->GetYaxis()->SetLabelOffset(999.);
hgrid->GetXaxis()->SetLabelOffset(999.);
and the result is only the grid, the histogram empty
Why have you added the option SAME in two places ? that was not what I sent you.
O,k if at some point you end up with something I can run, I will look at it.
Hi couet,
my apologies for the delayed response.
I send you a simple example.
{
TCanvas *c1 = new TCanvas("c1","Visualizzazione",10,10,1000,500);
gStyle->SetOptStat(0);
TH2C *h100 = new TH2C("h100","Visualizzazione",32,0.,32.,64,0.,64.);
for (int i=0; i<64; i++)
{
h100->Fill(25,i,1);
}
h100->GetXaxis()->SetNdivisions(32);
h100->GetYaxis()->SetNdivisions(16);
h100->SetFillColor(3);
// h100->Draw("BOX");
TPad *grid = new TPad("grid","",0,0,1,1);
grid->Draw();
grid->cd();
grid->SetGrid();
grid->SetFillStyle(4000);
TH2 *hgrid = new TH2C("hgrid","",32,0.,32.,64,0.,64.);
hgrid->Draw();
hgrid->GetXaxis()->SetNdivisions(32);
hgrid->GetYaxis()->SetNdivisions(64);
hgrid->GetYaxis()->SetLabelOffset(999.);
hgrid->GetXaxis()->SetLabelOffset(999.);
h100->Draw("BOX");
}
If I write h100->Draw("BOX"); after h100->SetFillColor(3); I obtain only the grid, like figure c1.gif,
if I write where it is now, I obtain the figure prova1.jpg.
Why?
I would the figure prova1.jpg with grid of figure c1.gif.
Thank you
Ciccio
Here it is:
grid3.C (809 Bytes)
It’s perfect!
Thank you
Ciccio
P.S.: Why don’t work if I write all in a single function?
one fill style was missing. Compare with the original code.
OK, I understad.
Thank you for the aid
Ciccio