# include # include # include # include # include # include using namespace std; # include "dislin.hpp" int main ( int argc, char *argv[] ); void timestamp ( ); //****************************************************************************80 int main ( int argc, char *argv[] ) //****************************************************************************80 // // Purpose: // // MAIN demonstrates the use of TeX for mathematical formulas. // // Licensing: // // This code is distributed under the GNU LGPL license. // // Modified: // // 01 March 2014 // // Author: // // This C++ version by John Burkardt. // // Reference: // // Helmut Michels, // The Data Plotting Software DISLIN - version 10.4, // Shaker Media GmbH, January 2010, // ISBN13: 978-3-86858-517-9. // { char cstr[80]; Dislin g; int nl; timestamp ( ); cout << "\n"; cout << "EX14:\n"; cout << " C++ version:\n"; cout << " Using TeX for mathematical formulas.\n"; // // Specify the format of the output file. // g.metafl ( "png" ); // // Indicate that new data overwrites old data. // g.filmod ( "delete" ); // // Specify the name of the output graphics file. // g.setfil ( "ex14.png" ); // // Choose the page size and orientation. // g.setpag ( "usal" ); // // For PNG output, reverse the default black background to white. // g.scrmod ( "reverse" ); // // Open DISLIN. // g.disini ( ); // // Plot a border around the page. // g.pagera ( ); // // Use the COMPLEX font. // g.complx ( ); g.height ( 40 ); strcpy ( cstr, "TeX Instructions for Mathematical Formulas" ); nl = g.nlmess ( cstr ); g.messag ( cstr, ( 2100 - nl ) / 2, 100 ); g.texmod ( "on" ); g.messag ( "$\\frac{1}{x+y}$", 150, 400 ); g.messag ( "$\\frac{a^2 - b^2}{a+b} = a - b$", 1200, 400 ); g.messag ( "$r = \\red{\\sqrt{x^2 + y^2}}", 150, 700); g.messag ( "$\\cos \\phi = \\frac{x}{\\sqrt{x^2 + y^2}}$", 1200, 700 ); g.messag ( "$\\Gamma(x) = \\int_0^\\infty e^{-t}t^{x-1}dt$", 150, 1000 ); g.messag ( "$\\lim_{x \\to \\infty} (1 + \\frac{1}{x})^x = e$", 1200, 1000 ); g.messag ( "$\\mu = \\sum_{i=1}^n x_i p_i$", 150, 1300 ); g.messag ( "$\\mu = \\int_{-\\infty}^ \\infty x f(x) dx$", 1200, 1300 ); g.messag ( "$\\overline{x} = \\frac{1}{n} \\sum_{i=1}^n x_i$", 150, 1600 ); g.messag ( "$s^2 = \\frac{1}{n-1} \\sum_{i=1}^n (x_i - \\overline{x})^2$", 1200, 1600 ); g.messag ( "$\\sqrt[n]{\\frac{x^n - y^n}{1 + u^{2n}}}$", 150, 1900 ); g.messag ( "$\\sqrt[3]{-q + \\sqrt{q^2 + p^3}}$", 1200, 1900 ); g.messag ( "$\\int \\frac{dx}{1+x^2} = \\arctan x + C$", 150, 2200 ); g.messag ( "$\\int \\frac{dx}{\\sqrt{1+x^2}} = {\\rm arcsinh} x + C$", 1200, 2200 ); g.messag ( "$\\overline{P_1P_2} = \\sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}$", 150, 2500 ); g.messag ( "$x = \\frac{x_1 + \\lambda x_2}{1 + \\lambda}\$", 1200, 2500 ); // // Close DISLIN. // g.disfin ( ); // // Terminate. // cout << "\n"; cout << "EX14:\n"; cout << " Normal end of execution.\n"; cout << "\n"; timestamp ( ); return 0; } //****************************************************************************80 void timestamp ( ) //****************************************************************************80 // // Purpose: // // TIMESTAMP prints the current YMDHMS date as a time stamp. // // Example: // // 31 May 2001 09:45:54 AM // // Licensing: // // This code is distributed under the GNU LGPL license. // // Modified: // // 08 July 2009 // // Author: // // John Burkardt // // Parameters: // // None // { # define TIME_SIZE 40 static char time_buffer[TIME_SIZE]; const struct std::tm *tm_ptr; size_t len; std::time_t now; now = std::time ( NULL ); tm_ptr = std::localtime ( &now ); len = std::strftime ( time_buffer, TIME_SIZE, "%d %B %Y %I:%M:%S %p", tm_ptr ); std::cout << time_buffer << "\n"; return; # undef TIME_SIZE }