text: from math import *
  
  class HammerProjection(object):
  	"""
  	See http://en.wikipedia.org/wiki/Hammer_projection
  	phi: latitude
  	theta: longitude
  	
  	"""
  	def __init__(self):
  		#self.theta0 = float(theta0)
  		#self.phi0 = float(phi0)
  		#self.radius = float(radius)
  		pass
  		
  		
  	def to_pixel(self, theta, phi):
  		phi = float(phi)
  		theta = float(theta)
  		z = acos(cos(phi)*cos(theta/2))
  		f = sqrt(2) / sqrt(1 + cos(phi)*cos(theta/2))
  		x = f*2*cos(phi)*sin(theta/2)
  		y = f*sin(phi)
  		return x, y
  		
  
  if __name__ == "__main__":
  	#p = sgp()
  	#print p.to_pixel(radians(0), radians(179.99))
  	pass