doc/v608/rf107__plotstyles_8C.html

#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooGaussian.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "RooPlot.h"
using namespace RooFit ;
void rf107_plotstyles()
{
   // S e t u p   m o d e l
   // ---------------------
   // Create observables
   RooRealVar x("x","x",-10,10) ;
   // Create Gaussian
   RooRealVar sigma("sigma","sigma",3,0.1,10) ;
   RooRealVar mean("mean","mean",-3,-10,10) ;
   RooGaussian gauss("gauss","gauss",x,mean,sigma) ;
   // Generate a sample of 100 events with sigma=3
   RooDataSet* data = gauss.generate(x,100) ;
   // Fit pdf to data
   gauss.fitTo(*data) ;
   // M a k e   p l o t   f r a m e s
   // -------------------------------
   // Make four plot frames to demonstrate various plotting features
   RooPlot* frame1 = x.frame(Name("xframe"),Title("Red Curve / SumW2 Histo errors"),Bins(20)) ;
   RooPlot* frame2 = x.frame(Name("xframe"),Title("Dashed Curve / No XError bars"),Bins(20)) ;
   RooPlot* frame3 = x.frame(Name("xframe"),Title("Filled Curve / Blue Histo"),Bins(20)) ;
   RooPlot* frame4 = x.frame(Name("xframe"),Title("Partial Range / Filled Bar chart"),Bins(20)) ;
   // D a t a   p l o t t i n g   s t y l e s
   // ---------------------------------------
   // Use sqrt(sum(weights^2)) error instead of Poisson errors
   data->plotOn(frame1,DataError(RooAbsData::SumW2)) ;
   // Remove horizontal error bars
   data->plotOn(frame2,XErrorSize(0)) ;
   // Blue markers and error bors
   data->plotOn(frame3,MarkerColor(kBlue),LineColor(kBlue)) ;
   // Filled bar chart
   data->plotOn(frame4,DrawOption("B"),DataError(RooAbsData::None),XErrorSize(0),FillColor(kGray)) ;
   // F u n c t i o n   p l o t t i n g   s t y l e s
   // -----------------------------------------------
   // Change line color to red
   gauss.plotOn(frame1,LineColor(kRed)) ;
   // Change line style to dashed
   gauss.plotOn(frame2,LineStyle(kDashed)) ;
   // Filled shapes in green color
   gauss.plotOn(frame3,DrawOption("F"),FillColor(kOrange),MoveToBack()) ;
   //
   gauss.plotOn(frame4,Range(-8,3),LineColor(kMagenta)) ;
   TCanvas* c = new TCanvas("rf107_plotstyles","rf107_plotstyles",800,800) ;
   c->Divide(2,2) ;
   c->cd(1) ; gPad->SetLeftMargin(0.15) ; frame1->GetYaxis()->SetTitleOffset(1.6) ; frame1->Draw() ;
   c->cd(2) ; gPad->SetLeftMargin(0.15) ; frame2->GetYaxis()->SetTitleOffset(1.6) ; frame2->Draw() ;
   c->cd(3) ; gPad->SetLeftMargin(0.15) ; frame3->GetYaxis()->SetTitleOffset(1.6) ; frame3->Draw() ;
   c->cd(4) ; gPad->SetLeftMargin(0.15) ; frame4->GetYaxis()->SetTitleOffset(1.6) ; frame4->Draw() ;

}