C++ (Cpp) TPaveLabel::SetTextAlign示例

void drawValueBox(double x1, double x2, double x3, int colour)
{

  char optionfile[60];
  std::vector<double> options;
  
  double delta1(0.), delta2(0.), delta3(0.), delta4(0.);
  double tsize(0.7);

  sprintf(optionfile,"./config/drawValueBox.dat");
  
  readData(optionfile,options);
  delta1 = options[0];
  delta2 = options[1];
  delta3 = options[2];
  delta4 = options[3];
  tsize  = options[4];
  
  double xmin = x1 + delta1;
  double xmax = x1 + delta2;
  double ymin = x2 + delta3;
  double ymax = x2 + delta4;

  if ( x1 < 0 && x2 > 0) {
    xmin = x1 - delta1;
    xmax = x1 - delta2;
  } 
  else if ( x1 < 0 && x2 < 0) {
    xmin = x1 - delta1;
    xmax = x1 - delta2;
    ymin = x2 - delta3;
    ymax = x2 - delta4;
  }
  else if ( x1 > 0 && x2 < 0) {
    ymin = x2 - delta3;
    ymax = x2 - delta4;
  }
  else if ( x1 == 0.0 ) {
    xmin = xmin - delta1;
    xmax = xmax ;
  }
  else if ( x2 == 0.0 ) {
    ymin = ymin - delta3;
    ymax = ymax ;
  }
  else {}


  char label[10];
  sprintf(label,"%.1f",float(x3));

  TPaveLabel *box = new TPaveLabel(xmin,ymin,xmax,ymax,label);
  box->SetBorderSize(0);
  box->SetTextFont(42);
  box->SetTextSize(tsize);
  box->SetTextAlign(22);
  box->SetTextColor(colour);
  if (colour == 1) box->SetFillStyle(4000);
  else {
    box->SetFillColor(10);
    box->SetTextColor(colour);
    box->SetBorderSize(1);
  }
  box->Draw("same");
  
  TLine * ln = new TLine(x1,x2,xmin,ymin);
  ln->SetLineWidth(1);
  ln->SetLineStyle(1);
  ln->SetLineColor(14);
  ln->Draw("same");
  
}