def test_path_is_walkable_0():
# This was a path that broke during play---a penguin walked
# straight into the river instead of walking over the bridge.
# Let's make sure it doesn't break any more.
stage = Stage('maps/test-river.tmx')
path = astar(stage, (27, 31), (6, 1))
assert path is not None
_ensure_path_is_legal(stage, path)
def enact(self):
assert not self._finished, \
'task enacted after it was finished'
# If the unit is already on the tile it needs to go beside,
# then step off the tile.
if (self._unit.x, self._unit.y) == self._target:
for dx in [-1, 0, 1]:
for dy in [-1, 0, 1]:
if (dx, dy) == (0, 0):
continue
if not tile_is_solid(
self._stage.get_tile_at(self._unit.x + dx,
self._unit.y + dy)):
self._unit.x += dx
self._unit.y += dy
self._finished = True
self._finished_proc()
return
# It is impossible to step off the tile, so just
# prolong the task.
return
# bug - if we are after an object and the object becomes
# unreachable, that should count as a block!
# If the target is not reachable, call blocked_proc.
if not unit_can_reach(self._unit, self._target):
self._finished = True
self._blocked_proc()
return
unit = self._unit
x, y = unit.x, unit.y
path = self._path
if len(path) == 1:
self._finished = True
self._finished_proc()
return
if self._timer == 0:
dx, dy = (self._path[0][0] - x, self._path[0][1] - y)
assert -1 <= dx <= 1
assert -1 <= dy <= 1
if not tile_is_solid(self._stage.get_tile_at(x + dx, y + dy)):
# Step toward the target.
unit.x += dx
unit.y += dy
self._path = path[1:]
else:
# The path was blocked, so calculate a new path.
self._path = astar(self._stage, (unit.x, unit.y), self._target)
if self._delay > 0:
self._timer = (self._timer + 1) % (self._delay + 1)
def enact(self):
assert not self._finished, \
'task enacted after it was finished'
# If we have reached the goal, just finish the task.
if (self._unit.x, self._unit.y) == self._target:
# We have reached the goal, so finish the task.
self._finished = True
self._finished_proc()
return
# bug - if we are after an object and the object becomes
# unreachable, that should count as a block!
# If the target is not reachable, call blocked_proc.
if not self._target_is_reachable():
self._finished = True
self._blocked_proc()
return
unit = self._unit
x, y = unit.x, unit.y
path = self._path
if self._target_is_solid and len(path) == 1:
# The target is solid and we've reached it,
# so finish the task.
self._finished = True
self._finished_proc()
return
if self._timer == 0:
dx, dy = (self._path[0][0] - x, self._path[0][1] - y)
assert -1 <= dx <= 1
assert -1 <= dy <= 1
if not tile_is_solid(self._stage.get_tile_at(x + dx, y + dy)):
# Step toward the target.
unit.x += dx
unit.y += dy
self._path = path[1:]
else:
# The path was blocked, so calculate a new path.
self._path = astar(self._stage, (unit.x, unit.y), self._target)
if self._delay > 0:
self._timer = (self._timer + 1) % (self._delay + 1)
def __init__(self,
stage,
unit,
target,
delay=0,
blocked_proc=None,
finished_proc=None):
self._unit = unit
self._delay = delay
self._timer = 0
self._target = target
self._blocked_proc = blocked_proc
self._finished_proc = finished_proc
self._stage = stage
self._finished = False
assert unit_can_reach(unit, target), \
'destination tile is unreachable'
# Find the path to the destination.
self._path = astar(stage, (unit.x, unit.y), target)
def __init__(self,
stage,
unit,
target,
delay=0,
blocked_proc=None,
finished_proc=None):
self._unit = unit
self._delay = delay
self._timer = 0
self._target = target
self._target_is_solid = \
tile_is_solid(stage.get_tile_at(target[0], target[1]))
self._blocked_proc = blocked_proc
self._finished_proc = finished_proc
self._stage = stage
self._finished = False
assert self._target_is_reachable(), \
'destination tile is unreachable'
# Find the path to the destination.
self._path = astar(stage, (unit.x, unit.y), target)
def test_path_returns_endpoints():
stage = Stage('maps/tuxville.tmx')
path = astar(stage, (50, 50), (50, 51))
assert path[0] == (50, 50)
assert path[-1] == (50, 51)
def test_path_correct_results_0():
stage = Stage('maps/tuxville.tmx')
path = astar(stage, (50, 50), (50, 51))
assert path is not None
def test_path_is_walkable_2():
stage = Stage('maps/test-river.tmx')
path = astar(stage, (30, 23), (6, 1))
assert path is not None
_ensure_path_is_legal(stage, path)