# include <math.h>
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <time.h>

# include "dislin.h"

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

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

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

/******************************************************************************/
/*
  Purpose:

    bulgaria_plot() makes a line plot of the Bulgarian population over time.

  Licensing:

    This code is distributed under the MIT license. 

  Modified:

    27 September 2024

  Author:

    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 *filename;
  FILE *input;
  int i;
  int m;
  float r;
  char *result;
  char str[80];
  float *x;
  float xmax;
  float xmin;
  float xstep;
  float *y;
  float ymax;
  float ymin;
  float ystep;

  timestamp ( );
  printf ( "\n" );
  printf ( "bulgaria_plot():\n" );
  printf ( "  C version:\n" );
  printf ( "  dislin() plots Bulgarian population over time.\n" );
/*
  Get M, the number of data pairs.
*/
  input = fopen ( "bulgaria_data.txt", "r" );
  m = 0;

  for ( ; ; )
  {
    result = fgets ( str, 80, input );

    if ( ! result )
    {
      break;
    }

    m = m + 1;
  }

  fclose ( input );
/*
  Get the X, Y data.
*/
  x = ( float * ) malloc ( m * sizeof ( float ) );
  y = ( float * ) malloc ( m * sizeof ( float ) );

  input = fopen ( "bulgaria_data.txt", "r" );

  for ( i = 0; i < m; i++ )
  {
    fscanf ( input, "%g %g", &x[i], &y[i] );
  }

  fclose ( input );
/*
  Specify the format of the output file.
*/
  metafl ( "png" );
/*
  Indicate that new data overwrites old data.
*/
  filmod ( "delete" );
/*
  Specify the name of the output graphics file.
*/
  filename = "bulgaria_plot.png";
  setfil ( filename );
/*
  Choose the page size and orientation.
  'USA' is 2160 plot units wide and 2790 plot units high.
  'L' requests LANDSCAPE orientation.
*/
  setpag ( "usal" );
/*
  For PNG output, reverse the default black background to white.
*/
  scrmod ( "reverse" );
/*
  Open DISLIN.
*/
  disini ( );
/*
  Plot a border around the page.
*/
  pagera ( );
/*
  Use the SIMPLX font.
*/
  simplx ( );
/*
  Set the axis origin 500 plot units to the right, and 1900 plot units DOWN.
*/
  axspos ( 500, 1900 );
/*
  Define the X and Y sizes of the axis system in plot units.
*/
  axslen ( 2190, 1260 );
/*
  Label the X and Y axes.
*/
  name ( "Year", "X" );
  name ( "Population", "Y" );
/*
  Relate the physical coordinates to the axes, and specify tick marks.
*/
  xmin = x[0];
  xmax = x[0];
  ymin = y[0];
  ymax = y[0];

  for ( i = 1; i < m; i++ )
  {
    xmin = fmin ( xmin, x[i] );
    xmax = fmax ( xmax, x[i] );
    ymin = fmin ( ymin, y[i] );
    ymax = fmax ( ymax, y[i] );
  }
  ymin = 0.0;
  xstep = ( xmax - xmin ) / 11;
  ystep = ( ymax - ymin ) / 11;

  graf ( xmin, xmax, xmin, xstep, ymin, ymax, ymin, ystep );
/*
  BEGIN LEVEL 2 COMMANDS.
*/

/*
  Define the title.
*/
  titlin ( "Bulgarian Population Over Time", 1 );
  titlin ( "1887-2022", 2 );
  title ( );
/*
  Add a grid, with one grid line for every tick mark in the X and Y axes.
*/
  grid ( 1, 1 );
/*
  Set the drawing color to "red";
*/
  color ( "red" );
/*
  Draw the curve.
*/
  curve ( x, y, m );
/*
  Set color to "blue".
*/
  color ( "blue" );
/*
  At every data point, draw a circle of radius r.
*/
  r = 0.50;
  for ( i = 0; i < m; i++ )
  {
    rlcirc ( x[i], y[i], r );
  }
/*
  End this graph.
*/
  endgrf ( );
/*
  RETURN FROM LEVEL 2 TO LEVEL 1.
*/
  printf ( "  Graphics saved as '%s'\n", filename );
/*
  Close DISLIN.
*/
  disfin ( );
/*
  Free memory.
*/
  free ( x );
  free ( y );
/*
  Terminate.
*/
  printf ( "\n" );
  printf ( "bulgaria_plot():\n" );
  printf ( "  Normal end of execution.\n" );
  printf ( "\n" );
  timestamp ( );

  return 0;
}
/******************************************************************************/

void timestamp ( )

/******************************************************************************/
/*
  Purpose:

    timestamp prints the current YMDHMS date as a time stamp.

  Example:

    17 June 2014 09:45:54 AM

  Licensing:

    This code is distributed under the MIT license. 

  Modified:

    17 June 2014

  Author:

    John Burkardt
*/
{
# define TIME_SIZE 40

  static char time_buffer[TIME_SIZE];
  const struct tm *tm;
  time_t now;

  now = time ( NULL );
  tm = localtime ( &now );

  strftime ( time_buffer, TIME_SIZE, "%d %B %Y %I:%M:%S %p", tm );

  printf ( "%s\n", time_buffer );

  return;
# undef TIME_SIZE
}