#! /usr/bin/env python3
#
def fly_plot ( ):

#*****************************************************************************80
#
## fly_plot() draws a plot of two random flies in the unit circle.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license. 
#
#  Modified:
#
#    09 January 2022
#
#  Author:
#
#    John Burkardt
#
  import numpy as np

  print ( "fly_plot:" )
  print ( "  Plot two random flies in the unit circle." )

  n = 100
  theta = np.linspace ( 0, 2.0 * np.pi, n )
  cx = np.cos ( theta )
  cy = np.sin ( theta )

  import matplotlib.pyplot as plt

  plt.plot ( cx, cy, 'b-', linewidth = 3 )
  plt.grid ( True )
  plt.axis ( 'equal' )

  fx = 2.0 * np.random.rand ( 2 ) - 1.0
  fy = 2.0 * np.random.rand ( 2 ) - 1.0
  plt.plot ( fx, fy, 'g*', markersize = 10 )

  plt.title ( 'Two random flies in a circle' )
  filename = 'fly_plot.jpg'
  plt.savefig ( filename )
  print ( "  Graphics saved as '" + filename + "'" )
  plt.show ( )
  plt.close ( )

  print ( "" )
  print ( "fly_plot:" )
  print ( "  Normal end of execution." )
  return

if ( __name__ == "__main__" ):
  fly_plot ( )