# include <cstdlib>
# include <iostream>
# include <iomanip>
# include <cmath>

using namespace std;

# include "dislin.H"

int main ( int argc, char *argv[] );

//******************************************************************************

int main ( int argc, char *argv[] )

//******************************************************************************
//
//  Purpose:
//
//    MAIN demonstrates the use of TeX for mathematical formulas.
//
//  Modified:
// 
//    03 September 2005
//
{
  char cstr[80];
  int nl;

  cout << "\n";
  cout << "DISLIN_EX14:\n";
  cout << "  Using TeX for mathematical formulas.\n";
//
//  Specify the format of the output file.
//
  metafl ( "PNG" );
//
//  Specify the name of the output graphics file.
//
  setfil ( "dislin_ex14.png" );

  setpag ( "da4p" );
  disini ( );
  pagera ( );
  complx ( );
  height ( 40 );

  strcpy ( cstr, "TeX Instructions for Mathematical Formulas" );
  nl = nlmess ( cstr );
  messag ( cstr, ( 2100 - nl ) / 2, 100 );
  
  texmod ( "on" );
  messag ( "$\\frac{1}{x+y}$", 150, 400 );
  messag ( "$\\frac{a^2 - b^2}{a+b} = a - b$", 1200, 400 );
  
  messag ( "$r = \\sqrt{x^2 + y^2}", 150, 700);
  messag ( "$\\cos \\phi = \\frac{x}{\\sqrt{x^2 + y^2}}$", 1200, 700 );

  messag ( "$\\Gamma(x) = \\int_0^\\infty e^{-t}t^{x-1}dt$", 150, 1000 );
  messag ( "$\\lim_{x \\to \\infty} (1 + \\frac{1}{x})^x = e$", 1200, 1000 );

  messag ( "$\\mu = \\sum_{i=1}^n x_i p_i$", 150, 1300 );
  messag ( "$\\mu = \\int_{-\\infty}^ \\infty x f(x) dx$", 1200, 1300 );

  messag ( "$\\overline{x} = \\frac{1}{n} \\sum_{i=1}^n x_i$", 150, 1600 );
  messag ( "$s^2 = \\frac{1}{n-1} \\sum_{i=1}^n (x_i - \\overline{x})^2$",
          1200, 1600 );

  messag ( "$\\sqrt[n]{\\frac{x^n - y^n}{1 + u^{2n}}}$", 150, 1900 );  
  messag ( "$\\sqrt[3]{-q + \\sqrt{q^2 + p^3}}$", 1200, 1900 );

  messag ( "$\\int \\frac{dx}{1+x^2} = \\arctan x + C$", 150, 2200 );
  messag ( "$\\int \\frac{dx}{\\sqrt{1+x^2}} = {\\rm arsinh} x + C$",
          1200, 2200 );

  messag ( "$\\overline{P_1P_2} = \\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}$",
           150, 2500 );
  messag ( "$x = \\frac{x_1 + \\lambda x_2}{1 + \\lambda}$", 1200, 2500 );
  disfin ( );

  cout << "\n";
  cout << "DISLIN_EX14:\n";
  cout << "  Normal end of execution.\n";

  return 0;
}