doc/hackathon/gr111__legend_8C.html

void gr111_legend() {


   auto c = new TCanvas("c","", 900, 800);

   c->SetGrid();


   const Int_t n = 5;

   Double_t x[n] = {-3.00, -2.68, -2.36, -2.05, -1.73};

   Double_t y1[n] = {-0.98, -0.89, -0.71, -0.46, -0.16};

   Double_t y2[n] = {-2.98, -2.89, -2.71, -2.46, -2.16};


   TGraph *gr1 = new TGraph(n, x, y1); //Create the graph

   gr1->SetLineColor(2);

   gr1->SetLineWidth(4);

   gr1->SetMarkerColor(4);

   gr1->SetMarkerStyle(21);

   gr1->SetTitle("Graph with legend");


   TLegend *legend = new TLegend(0.1,0.7,0.38,0.9); //Create the TLegend object and define it's position

   legend->SetHeader("Legend title", "C"); //"C" Center alignment for the header ("L" Left and "R" Right)

   legend->SetFillColor(kWhite);

   legend->SetBorderSize(1);

   legend->SetTextSize(0.04);

   legend->AddEntry(gr1, "Data points", "lp");  // "p" for point marker, "l" for line, "e" for error bars if TGraphError is used.


   gr1->Draw("");


   // Draw the legend

   legend->Draw();

}

c
#define c(i)
Definition RSha256.hxx:101

Int_t
int Int_t
Signed integer 4 bytes (int).
Definition RtypesCore.h:59

Double_t
double Double_t
Double 8 bytes.
Definition RtypesCore.h:73

kWhite
@ kWhite
Definition Rtypes.h:66

TAttFill::SetFillColor
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:40

TAttLine::SetLineWidth
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition TAttLine.h:47

TAttLine::SetLineColor
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition TAttLine.h:44

TAttMarker::SetMarkerColor
virtual void SetMarkerColor(Color_t mcolor=1)
Set the marker color.
Definition TAttMarker.h:41

TAttMarker::SetMarkerStyle
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition TAttMarker.h:43

TAttText::SetTextSize
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition TAttText.h:53

TCanvas
The Canvas class.
Definition TCanvas.h:23

TGraph
Definition TGraph.h:41

TGraph::Draw
void Draw(Option_t *chopt="") override
Default Draw method for all objects.

TGraph::SetTitle
void SetTitle(const char *title="") override
Set the title of the TNamed.

TLegend
Definition TLegend.h:23

TLegend::AddEntry
TLegendEntry * AddEntry(const TObject *obj, const char *label="", Option_t *option="lpf")

TLegend::Draw
void Draw(Option_t *option="") override
Draw this box with its current attributes.

TLegend::SetHeader
virtual void SetHeader(const char *header="", Option_t *option="")

TPave::SetBorderSize
virtual void SetBorderSize(Int_t bordersize=4)
Sets the border size of the TPave box and shadow.
Definition TPave.h:79

x
Double_t x[n]
Definition legend1.C:17

n
const Int_t n
Definition legend1.C:16