Projection functions
====================

Example: ::
	
	# Produces line projection
	# ....................
	# ....................
	# .@*******#..........
	# ....................
	# ....................
	rlfl.project_beam(map_number, p, p1)
	    
	# Produces line to ball projection
	# Note: ball spells are usually a combination 
	#       of beam and ball.
	# ........***...........
	# .......*****..........
	# .@....*******.........
	# .......*****..........
	# ........***...........
	rlfl.project_ball(map_number, p, p1, 3)
	    
	# Adding the rlfl.PROJECT_SHEL flag
	# ........***...........
	# .......*...*..........
	# .@....*.....*.........
	# .......*...*..........
	# ........***...........
	rlfl.project_ball(map_number, p, p1, 3, rlfl.PROJECT_SHEL)
	
	# Adding the rlfl.PROJECT_SQUARE flag
	# ......*******.........
	# ......*******.........
	# .@....*******.........
	# ......*******.........
	# ......*******.........
	rlfl.project_ball(map_number, p, p1, 3, rlfl.PROJECT_SQUARE)
	
	# Adding the rlfl.PROJECT_SQUARE|rlfl.PROJECT_SHEL flag
	# ......*******.........
	# ......*.....*.........
	# .@....*.....*.........
	# ......*.....*.........
	# ......*******.........
	rlfl.project_ball(map_number, p, p1, 3, rlfl.PROJECT_SQUARE|rlfl.PROJECT_SHEL)
	
	# Adding the rlfl.PROJECT_DIAMOND flag
	# .........*............
	# ........***...........
	# .@.....*****..........
	# ........***...........
	# .........*............
	rlfl.project_ball(map_number, p, p1, 2, rlfl.PROJECT_DIAMOND)
	
	# Adding the rlfl.PROJECT_DIAMOND|rlfl.PROJECT_SHEL flag
	# .........*............
	# ........*.*...........
	# .@.....*...*..........
	# ........*.*...........
	# .........*............
	rlfl.project_ball(map_number, p, p1, 2, rlfl.PROJECT_DIAMOND|rlfl.PROJECT_SHEL)
	    
	# Produces breath projection
	# .........***.......
	# .....********......
	# .D********@**......
	# .....********......
	# .........***.......
	rlfl.project_cone(map_number, p, p1, 3)
	
	# 3 Enemys (or walls) marked with rlfl.CELL_REFL
	#.....R.....#........
	#....*.*...*.........
	#...*...*.*..........
	#..R.....R...........
	#...*................
	#....@...............
	#....................
	rlfl.project_beam(map_number, p, p1, rlfl.MAX_RANGE, rlfl.PROJECT_REFL)
	
Projection flags
----------------

.. attribute:: rlfl.PROJECT_THRU

	Causes the projection to ignore walls
	
.. attribute:: rlfl.PROJECT_STOP

	Causes projection to stop on first cell marked rlfl.CELL_OCUP
	
.. attribute:: rlfl.PROJECT_PASS

	Causes projection not to stop at target
	
.. attribute:: rlfl.PROJECT_SHEL

	Causes empty ball projection.
	
.. attribute:: rlfl.PROJECT_SQUARE

	Causes a square shaped projection.
	
.. attribute:: rlfl.PROJECT_DIAMOND

	Causes a diamond shaped projection.
	
.. attribute:: rlfl.PROJECT_REFL

	Causes projection to bounce of cells marked CELL_REFL.
	
Function list
-------------

.. function:: rlfl.project_beam(map_number, source, target[, range, flags])

	Return a beam projection as a set on tuples `(x, y)`.
	
	`range` defaults to max range.
	
.. function:: rlfl.project_ball(map_number, source, target, radius[, range, flags])

	Return a ball shaped projection as a set on tuples `(x, y)`.
	
	`range` defaults to max range.
	
.. function:: rlfl.project_cone(map_number, source, target, radius[, range, flags])

	Return a cone shaped projection as a set on tuples `(x, y)`.
	
	`range` defaults to max range.