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Better support for custom action handling and custom Bullet/Action subclasses.
author
Joe Wreschnig
<joe.wreschnig@gmail.com>
Fri, 19 Mar 2010 08:19:27 +0000
(
01:19
-0700)
committer
Joe Wreschnig
<joe.wreschnig@gmail.com>
Fri, 19 Mar 2010 08:19:27 +0000
(
01:19
-0700)
bulletml/impl.py
patch
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diff --git
a/bulletml/impl.py
b/bulletml/impl.py
index
0548b9d
..
e800810
100644
(file)
--- a/
bulletml/impl.py
+++ b/
bulletml/impl.py
@@
-6,15
+6,22
@@
import math
from bulletml import parser
from bulletml import parser
-# TODO(jfw): This is very non-Pythonic, it's pretty much just the
-# BulletML reference ActionImpl translated to Python.
-
PI_2 = math.pi * 2
__all__ = ["Action", "Bullet"]
class Action(object):
PI_2 = math.pi * 2
__all__ = ["Action", "Bullet"]
class Action(object):
- """Running action implementation."""
+ """Running action implementation.
+
+ To implement new actions,
+
+ - Add a new element/class pair to parser.ActionDef.CONSTRUCTORS.
+ It should support FromXML, __getstate__, and __setstate__.
+ - Subclass impl.Action and override the 'handle' method to handle
+ your custom action type.
+ - Pass the impl.Bullet constructor your Action subclass when
+ creating your root Bullet.
+ """
def __init__(self, owner, parent, actions, params, rank, repeat=1):
self.actions = actions
def __init__(self, owner, parent, actions, params, rank, repeat=1):
self.actions = actions
@@
-61,9
+68,10
@@
class Action(object):
self.previous_fire_direction = other.previous_fire_direction
self.previous_fire_speed = other.previous_fire_speed
self.previous_fire_direction = other.previous_fire_direction
self.previous_fire_speed = other.previous_fire_speed
- def step(self, owner,
rank,
created, sin=math.sin, cos=math.cos):
+ def step(self, owner, created, sin=math.sin, cos=math.cos):
"""Advance by one frame."""
s_params = self.params
"""Advance by one frame."""
s_params = self.params
+ rank = owner.rank
if self.speed_frames > 0:
self.speed_frames -= 1
if self.speed_frames > 0:
self.speed_frames -= 1
@@
-112,16
+120,17
@@
class Action(object):
if isinstance(action, parser.Repeat):
repeat, (actions, params) = action(s_params, rank)
if isinstance(action, parser.Repeat):
repeat, (actions, params) = action(s_params, rank)
- child = Action(owner, self, actions, params, rank, repeat)
+ child = self.__class__(
+ owner, self, actions, params, rank, repeat)
owner.replace(self, child)
owner.replace(self, child)
- child.step(owner,
rank,
created, sin, cos)
+ child.step(owner, created, sin, cos)
break
elif isinstance(action, (parser.ActionDef, parser.ActionRef)):
actions, params = action(s_params, rank)
break
elif isinstance(action, (parser.ActionDef, parser.ActionRef)):
actions, params = action(s_params, rank)
- child =
Action
(owner, self, actions, params, rank)
+ child =
self.__class__
(owner, self, actions, params, rank)
owner.replace(self, child)
owner.replace(self, child)
- child.step(owner,
rank,
created, sin, cos)
+ child.step(owner, created, sin, cos)
break
elif isinstance(action, (parser.FireDef, parser.FireRef)):
break
elif isinstance(action, (parser.FireDef, parser.FireRef)):
@@
-165,7
+174,7
@@
class Action(object):
x += off_x
y += off_y
x += off_x
y += off_y
- bullet =
Bullet
(
+ bullet =
owner.__class__
(
x, y, direction, speed, owner.target, actions, self, rank)
created.append(bullet)
x, y, direction, speed, owner.target, actions, self, rank)
created.append(bullet)
@@
-251,6
+260,13
@@
class Action(object):
owner.vanish()
break
owner.vanish()
break
+ else:
+ self.handle(action, owner, created, sin, cos)
+
+ def handle(self, action, owner, created, sin, cos):
+ """Override in subclasses for new action types."""
+ raise NotImplementedError(action.__class__.__name__)
+
class Bullet(object):
"""Simple bullet implementation.
class Bullet(object):
"""Simple bullet implementation.
@@
-274,7
+290,7
@@
class Bullet(object):
"""
def __init__(self, x=0, y=0, direction=0, speed=0, target=None,
"""
def __init__(self, x=0, y=0, direction=0, speed=0, target=None,
- actions=(), parent=None, rank=0.5):
+ actions=(), parent=None, rank=0.5
, Action=Action
):
self.x = self.px = x
self.y = self.py = y
self.mx = 0
self.x = self.px = x
self.y = self.py = y
self.mx = 0
@@
-352,7
+368,7
@@
class Bullet(object):
created = []
for action in self._actions:
created = []
for action in self._actions:
- action.step(self,
self.rank,
created, sin, cos)
+ action.step(self, created, sin, cos)
self.px = self.x
self.py = self.y
self.px = self.x
self.py = self.y