Logo ROOT  
Reference Guide
 
Loading...
Searching...
No Matches
transp_text.C File Reference

Detailed Description

This macro is based on labels1.C by Rene Brun.

Updated by Timur Pocheptsov to use transparent text. The macro requires OpenGL or Web-based canvas

// Includes for ACLiC (cling does not need them).
#include "TPaveText.h"
#include "TCanvas.h"
#include "TRandom.h"
#include "TError.h"
#include "TColor.h"
#include "TStyle.h"
#include "TH1F.h"
void transp_text(bool gl = true)
{
// 1. Create special transparent colors for both pavetext fill color and text color.
auto grayColorIndex = TColor::GetColor((Float_t)0.8, 0.8, 0.8, 0.85);
auto blackColorIndex = TColor::GetColor((Float_t)0., 0., 0., 0.5);
// 2. Create a TCanvas.
auto c1 = new TCanvas("transp_text", "transparent text demo", 10, 10, 900, 500);
if (!c1->UseGL() && !c1->IsWeb())
::Warning("transp_text", "to use this macro you need either OpenGL or Web");
c1->SetGrid();
c1->SetBottomMargin(0.15);
const Int_t nx = 20;
const char *people[nx] = {"Jean", "Pierre", "Marie", "Odile", "Sebastien", "Fons", "Rene",
"Nicolas", "Xavier", "Greg", "Bjarne", "Anton", "Otto", "Eddy",
"Peter", "Pasha", "Philippe", "Suzanne", "Jeff", "Valery"};
auto h = new TH1F("h4", "test", nx, 0, nx);
h->SetFillColor(38);
for (Int_t i = 0; i < 5000; ++i)
h->Fill(gRandom->Gaus(0.5 * nx, 0.2 * nx));
h->SetStats(false);
for (Int_t i = 1; i <= nx; ++i)
h->GetXaxis()->SetBinLabel(i, people[i - 1]);
h->Draw();
auto pt = new TPaveText(0.3, 0.3, 0.98, 0.98, "brNDC");
// Transparent 'rectangle' with transparent text.
pt->SetFillColor(grayColorIndex);
pt->SetTextColor(blackColorIndex);
pt->SetTextSize(0.5);
pt->AddText("Hello");
pt->Draw();
}
#define h(i)
Definition RSha256.hxx:106
int Int_t
Definition RtypesCore.h:45
float Float_t
Definition RtypesCore.h:57
void Warning(const char *location, const char *msgfmt,...)
Use this function in warning situations.
Definition TError.cxx:229
R__EXTERN TRandom * gRandom
Definition TRandom.h:62
R__EXTERN TStyle * gStyle
Definition TStyle.h:436
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:37
virtual void SetTextAlign(Short_t align=11)
Set the text alignment.
Definition TAttText.h:42
virtual void SetTextColor(Color_t tcolor=1)
Set the text color.
Definition TAttText.h:44
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition TAttText.h:47
The Canvas class.
Definition TCanvas.h:23
static Int_t GetColor(const char *hexcolor)
Static method returning color number for color specified by hex color string of form: "#rrggbb",...
Definition TColor.cxx:1921
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:623
A Pave (see TPave) with text, lines or/and boxes inside.
Definition TPaveText.h:21
virtual TText * AddText(Double_t x1, Double_t y1, const char *label)
Add a new Text line to this pavetext at given coordinates.
void Draw(Option_t *option="") override
Draw this pavetext with its current attributes.
virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1)
Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigm...
Definition TRandom.cxx:275
void SetCanvasPreferGL(Bool_t prefer=kTRUE)
Definition TStyle.h:341
TPaveText * pt
return c1
Definition legend1.C:41
Authors
Timur Pocheptsov, Sergey Linev

Definition in file transp_text.C.