Named macro produces no plot

From: Roger Mason <rmason_at_esd.mun.ca>
Date: Sun, 14 Jun 2009 08:01:26 -0230

Hello,

I'm trying to produce the plot of a plane. I can produce the plot from an unnamed macro but the named version displays an empty canvas. Here are the two macros:

// This produces a plot
{
  gSystem->Load("libGenVector");

  ROOT::Math::XYZPoint p1(500,500,200);
  ROOT::Math::XYZPoint p2(950,250,20);
  ROOT::Math::XYZPoint p3(750,50,20);
  ROOT::Math::Plane3D plane(p1,p2,p3);

  Double_t A = plane.A();

  Double_t B = plane.B();
  Double_t C = plane.C();

  Double_t a = A/-C;
  Double_t b = B/-C;
  Double_t c = C/-C;

  cout << " a = " << a
       << " b = " << b
       << " c = " << c
       << endl;

  // View the plane
  TF2 p = TF2("p","[0]*x + [1]*y",-10,10,-10,10);   p.SetParameters(a,b);
  p.Draw();

}

// This produces an empty canvas
#ifndef __CINT__
#include "TMatrixD.h"
#include "TVectorD.h"
#include "TMath.h"
#include "Math/Point3D.h"
#include "Math/Vector3D.h"
#include "Math/Vector4D.h"
#include "Math/Rotation3D.h"
#include "Math/EulerAngles.h"
#include "Math/AxisAngle.h"
#include "Math/Quaternion.h"
#include "Math/RotationX.h"
#include "Math/RotationY.h"
#include "Math/RotationZ.h"
#include "Math/RotationZYX.h"
#include "Math/LorentzRotation.h"
#include "Math/Boost.h"
#include "Math/BoostX.h"
#include "Math/BoostY.h"
#include "Math/BoostZ.h"
#include "Math/Transform3D.h"
#include "Math/Plane3D.h"
#include "Math/VectorUtil.h"
#endif

void plane2()
{
  gSystem->Load("libGenVector");

  ROOT::Math::XYZPoint p1(500,500,200);
  ROOT::Math::XYZPoint p2(950,250,20);
  ROOT::Math::XYZPoint p3(750,50,20);
  ROOT::Math::Plane3D plane(p1,p2,p3);

  Double_t A = plane.A();

  Double_t B = plane.B();
  Double_t C = plane.C();

  Double_t a = A/-C;
  Double_t b = B/-C;
  Double_t c = C/-C;

  cout << " a = " << a
       << " b = " << b
       << " c = " << c
       << endl;

  // View the plane
  TF2 p = TF2("p","[0]*x + [1]*y",-10,10,-10,10);   p.SetParameters(a,b);
  p.Draw();

}

I'm using ROOT 5.20/00 (trunk_at_24524, May 17 2009, 10:14:00 on linux). Can someone explain what I must do to get the named version to produce a plot?

Thanks,
Roger Received on Sun Jun 14 2009 - 12:46:03 CEST