# include <stdio.h>
# include <math.h>

# include "dislin.h"

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

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

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

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

    MAIN demonstrates the use of the POLAR routine.

  Modified:
 
    02 September 2005
*/
{ 
# define M 10
# define N 300

  float a;
  float f = 3.1415926 / 180.0;
  int i;
  double step;
  float x2[M];
  float xray[N];
  float y2[M];
  float yray[N];
  
  printf ( "\n" );
  printf ( "DISLIN_EX02:\n" );
  printf ( "  Demonstrate the use of the POLAR routine, for\n" );
  printf ( "  plotting (R,Theta) data.\n" );

  step = 360.0 / ( float ) ( N - 1 );

  for ( i = 0; i < N; i++ )
  { 
    a = ( float ) i * step * f;
    yray[i] = a;
    xray[i] = sin ( 5.0 * a );
  }

  for ( i = 0; i < M; i++ )
  {
    x2[i] = ( float ) ( i + 1 );
    y2[i] = ( float ) ( i + 1 );
  }
/*
  Specify the format of the output file.
*/
  metafl ( "PNG" );
/*
  Specify the name of the output graphics file.
*/
  setfil ( "dislin_ex02.png" );

  setpag ( "da4p" );

  disini ( );
  pagera ( );
  hwfont ( );
  axspos ( 450, 1800 );

  titlin ( "Polar Plots", 2 );
  ticks  ( 3, "Y" );
  axends ( "NOENDS", "X" );
  labdig ( -1, "Y" );
  axslen ( 1000, 1000 );
  axsorg ( 1050, 900 );

  polar  ( 1.0, 0.0, 0.2, 0.0, 30.0 );
  curve  ( xray, yray, N );
  htitle ( 50 );
  title  ( );
  endgrf ( );

  labdig ( -1, "X" );
  axsorg ( 1050, 2250 );
  labtyp ( "VERT", "Y" );
  polar  ( 10.0, 0.0, 2.0, 0.0, 30.0 );
  barwth ( -5.0 );
  polcrv ( "FBARS" );
  curve  ( x2, y2, M );
             
  disfin ( );

  printf ( "\n" );
  printf ( "DISLIN_EX02:\n" );
  printf ( "  Normal end of execution.\n" );

  return 0;
# undef M
# undef N
}