I have wrotten a cxx file with ROOT libraries, is a GUI, that could plot a function when I click Draw, but this doesn’t draw nothing. I create an executble, shows the Canvas, but does’t plot. When I compile with root -l this plot the function.
You’re missing at least an event loop if not also a TApplication. In general our recommendation is: just don’t. If you really insist 
then this will help:
#include <TApplication.h>
int main(int argc, char **argv)
{
TApplication theApp("App", &argc, argv);
// Your code goes here.
theApp.Run();
return 0;
}
I wrote that, but the executable doesn’t plot the function. Is possible the loop for doesn’t permit plot the function?
It’s more likely that you have an ownership issue, e.g.
- there is a file that’s being closed and that’s deleting the function
- the function is a local variable that goes out of scope
etc.
Hard to tell without the actual code.
When I compile the executable, terminal shows: Error in TQObject::CheckConnectArgs: slot Dibujar() does not exist
This is the code:
#include "TMath.h"
#include "TGraph.h"
#include "TRandom.h"
#include "TCanvas.h"
#include "Riostream.h"
#include <TGButton.h>
#include <TGFrame.h>
#include <TGClient.h>
#include <TGNumberEntry.h>
#include <TApplication.h>
#include <TAttLine.h>
#include <TGWindow.h>
#include <TGLabel.h>
#include <TGTextEntry.h>
#include <TGButtonGroup.h>
#include <TRootEmbeddedCanvas.h>
#include <RQ_OBJECT.h>
#include <TQObject.h>
#include <TGLayout.h>
#include <TAxis.h>
using namespace std;
TGraph *G;
TCanvas *C;
class Nueva {
RQ_OBJECT("Nueva")
private:
TGNumberEntry *N1, *MAX,*MIN,*AA,*BB,*CC;
TGLabel *L1,*L2,*L3,*L4,*L5,*L6;
TGTextButton *B1, *B2;
TGGroupFrame *Caja1, *Caja2,*Caja3,*Caja4,*Caja5,*Caja6;
TGMainFrame *Ventana;
TRootEmbeddedCanvas *Lienzo;
TGHorizontalFrame *hoframe;
public:
Nueva(const TGWindow *p, UInt_t w,UInt_t h);
virtual ~Nueva();
Double_t GA1(){return N1->GetNumber();}
Double_t GA2(){return MAX->GetNumber();}
Double_t GA3(){return MIN->GetNumber();}
Double_t GA4(){return AA->GetNumber();}
Double_t GA5(){return BB->GetNumber();}
Double_t GA6(){return CC->GetNumber();}
void Dibujar();
};
Nueva::Nueva(const TGWindow *p,UInt_t w,UInt_t h){
//---------------------------
// MARCO PRINCIPAL
//---------------------------
Ventana=new TGMainFrame(p,w,h);
//-----------------------
Lienzo=new TRootEmbeddedCanvas("Ecanvas",Ventana);
//-------------------------
// Marco secunadario
//-------------------------
hoframe=new TGHorizontalFrame(Ventana);
//--------- Botones
B1=new TGTextButton(hoframe,"&Ejecutar");
B2=new TGTextButton(hoframe,"&Salir","gApplication->Terminate(0)");
B1->Connect("Clicked()","Nueva", this,"Dibujar()");
//-------------- Condiciones y parámetros
Caja1=new TGGroupFrame(hoframe,"Tabulaciones");
Caja1->SetLayoutBroken(kTRUE);
Caja2=new TGGroupFrame(hoframe,"L\355mites");
Caja2->SetLayoutBroken(kTRUE);
Caja3=new TGGroupFrame(hoframe,"Par\341metros");
Caja3->SetLayoutBroken(kTRUE);
//------Etiquetas
L1=new TGLabel(Caja1, "Puntos");
L2=new TGLabel(Caja2, "M\341x");
L3=new TGLabel(Caja2, "Min");
L4=new TGLabel(Caja3, "a");
L5=new TGLabel(Caja3, "b");
L6=new TGLabel(Caja3, "c");
//---Posición Etiqueta
L1->MoveResize(35,20,35,10);
L2->MoveResize(35,20,20,10);
L3->MoveResize(95,20,20,10);
L4->MoveResize(35,20,20,10);
L5->MoveResize(95,20,20,10);
L6->MoveResize(155,20,20,10);
//------------------ entradas de números
N1=new TGNumberEntry(Caja1,0,9,999,
TGNumberFormat::kNESReal,
TGNumberFormat::kNEAAnyNumber,
TGNumberFormat::kNELLimitMinMax,
0,20000);
MAX=new TGNumberEntry(Caja2,0,9,999,
TGNumberFormat::kNESReal,
TGNumberFormat::kNEAAnyNumber,
TGNumberFormat::kNELLimitMinMax,
-20000,20000);
MIN=new TGNumberEntry(Caja2,0,9,999,
TGNumberFormat::kNESReal,
TGNumberFormat::kNEAAnyNumber,
TGNumberFormat::kNELLimitMinMax,
-20000,20000);
AA=new TGNumberEntry(Caja3,0,9,999,
TGNumberFormat::kNESReal,
TGNumberFormat::kNEAAnyNumber,
TGNumberFormat::kNELLimitMinMax,
-20000,20000);
BB=new TGNumberEntry(Caja3,0,9,999,
TGNumberFormat::kNESReal,
TGNumberFormat::kNEAAnyNumber,
TGNumberFormat::kNELLimitMinMax,
-20000,20000);
CC=new TGNumberEntry(Caja3,0,9,999,
TGNumberFormat::kNESReal,
TGNumberFormat::kNEAAnyNumber,
TGNumberFormat::kNELLimitMinMax,
-20000,20000);
//------------------------
// Ubicación
//--------------------------
//____-___________Ventana
Ventana->SetWMSizeHints(700,600,1600,800,10,10);
//-----------Disposición de caja
Caja1->MoveResize(0,0,80,100);
Caja2->MoveResize(0,0,150,100);
Caja3->MoveResize(0,0,200,100);
//------
N1->MoveResize(20,40,50,20);
MAX->MoveResize(20,40,40,20);
MIN->MoveResize(80,40,40,20);
AA->MoveResize(20,40,50,20);
BB->MoveResize(80,40,50,20);
CC->MoveResize(140,40,50,20);
//--------------Inicializando entrada numérica
N1->SetNumber(0.0);
MAX->SetNumber(0.0);
MIN->SetNumber(0.0);
AA->SetNumber(0.0);
BB->SetNumber(0.0);
CC->SetNumber(0.0);
//--------
hoframe->AddFrame(B1,new TGLayoutHints(kLHintsCenterX|kLHintsCenterY,5,5,3,4));
hoframe->AddFrame(B2,new TGLayoutHints(kLHintsCenterX|kLHintsCenterY,5,5,3,4));
hoframe->AddFrame(Caja1,new TGLayoutHints(kLHintsCenterX|kLHintsCenterY,5,5,3,4));
hoframe->AddFrame(Caja2,new TGLayoutHints(kLHintsCenterX|kLHintsCenterY,5,5,3,4));
hoframe->AddFrame(Caja3,new TGLayoutHints(kLHintsCenterX|kLHintsCenterY,5,5,3,4));
Ventana->AddFrame(Lienzo, new TGLayoutHints(kLHintsExpandX|kLHintsExpandY,10,10,10,1));
Ventana->AddFrame(hoframe, new TGLayoutHints(kLHintsCenterX,2,2,2,2));
//----Nombre al marco principal
Ventana->SetWindowName("Cuadr\341tica");
//-----Subventanas
Ventana->MapSubwindows();
//------Inicializar el algoritmo layout
Ventana->Resize(Ventana->GetDefaultSize());
//----Mapear marco principal
Ventana->MapWindow();
}
Nueva::~Nueva(){
Ventana->Cleanup();
delete Ventana;
}
void Nueva::Dibujar(){
Double_t a=GA4(),b=GA5(),c=GA6();
Int_t N=GA1();
Double_t x,f;
Double_t min=GA3(),max=GA2();
C = Lienzo->GetCanvas();
C->cd();
C -> SetGrid();
C->ToggleEditor();
G= new TGraph();
//TF1 *f1;
x=min;
for(Int_t i=0;i<=N;i++){
//x=(i-N/2)*(max-min)/N;
f=a*pow(x,2)+b*x+c;
G->SetPoint(i,x,f);
//f1=new TF1("f1","f",0);
cout<<x<<"\t"<<f<<endl;
x=x+((max-min)/(double)N);
}
G->SetTitle("Cuadr\341tica");
G -> GetXaxis() -> SetTitle("x");
G -> GetYaxis() -> SetTitle("F(x)");
G -> Draw("AC*");
//G-> SetLineColor("Red");
C->SetWindowSize(1000,1000);
C -> Update();
C -> Modified();
}
void cuadratica(){
new Nueva(gClient->GetRoot(),300,300);
}
int main(Int_t argc,Char_t **argv){
TApplication CuaApp("App",&argc,argv);
cuadratica();
CuaApp.Run();
return 0;
}
Hi,
You have to generate a dictionary (using a rootcling or rootcint) for your class in order to be used by the signal/slot mechanism.
Cheers, Bertrand.
This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.