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mazeHTN_methods.py
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mazeHTN_methods.py
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import pyhop
"""
HELPER FUNCTIONS
"""
def is_done(state, a):
"""Checks current state of domain for whether the player has reached the goal"""
if state.x[a] == state.goal_x[a] and state.y[a] == state.goal_y[a]:
return True
else:
return False
def is_dead_end(state, a):
"""Checks current state of domain for whether the player has reached a dead end"""
paths = 0
if state.maze.cell_at(state.x[a], state.y[a]).has_wall('N'):
paths += 1
elif state.maze.cell_at(state.x[a], state.y[a]).has_wall('S'):
paths += 1
elif state.maze.cell_at(state.x[a], state.y[a]).has_wall('E'):
paths += 1
elif state.maze.cell_at(state.x[a], state.y[a]).has_wall('W'):
paths += 1
if paths > 1 and state.x[a] != 0 and state.y[a] != 0:
return False
else:
return True
def status(state, a):
"""Checks current state and returns a message if player is either done or in a dead end"""
if is_done(state, a):
return 'done'
elif is_dead_end(state, a):
return 'dead_end'
"""
METHODS
"""
# Methods for FindGoal
def walk(state, a):
"""If player has not reached goal, walk in a single direction"""
if status(state, a) == 'done':
return []
else:
return [('WalkTask', a)]
pyhop.declare_methods('FindGoal', walk)
# Methods for WalkTask
def north(state, a):
"""Walk 1 unit north, then recurse for next direction"""
return [('up', a), ('FindGoal', a)]
def south(state, a):
"""Walk 1 unit south, then recurse for next direction"""
return [('down', a), ('FindGoal', a)]
def west(state, a):
"""Walk 1 unit west, then recurse for next direction"""
return [('left', a), ('FindGoal', a)]
def east(state, a):
"""Walk 1 unit east, then recurse for next direction"""
return [('right', a), ('FindGoal', a)]
pyhop.declare_methods('WalkTask', south, north, west, east)