text: from matplotlib import pyplot as plt
  from matplotlib.patches import Circle
  import matplotlib.lines as lines
  
  from math import sin
  from math import cos
  from math import radians
  
  #--- FUNCTIONS ----------------------------------------------------------------+
  
  def plot_organism(x1, y1, theta, ax):
  
      circle = Circle([x1,y1], 0.05, edgecolor = 'g', facecolor = 'lightgreen', zorder=8)
      ax.add_artist(circle)
  
      edge = Circle([x1,y1], 0.05, facecolor='None', edgecolor = 'darkgreen', zorder=8)
      ax.add_artist(edge)
  
      tail_len = 0.075
      
      x2 = cos(radians(theta)) * tail_len + x1
      y2 = sin(radians(theta)) * tail_len + y1
  
      ax.add_line(lines.Line2D([x1,x2],[y1,y2], color='darkgreen', linewidth=1, zorder=10))
  
      pass
  
  
  def plot_food(x1, y1, ax):
  
      circle = Circle([x1,y1], 0.03, edgecolor = 'darkslateblue', facecolor = 'mediumslateblue', zorder=5)
      ax.add_artist(circle)
      
      pass
  
  #--- END ----------------------------------------------------------------------+
  