X-Git-Url: https://git.yukkurigames.com/?p=python-bulletml.git;a=blobdiff_plain;f=bulletml%2Fimpl.py;h=836fb410c4efbaaafec9a1c60c7d90b2b7bf50e9;hp=f0e8964d806351cd9a2e876db194730da44bc4f9;hb=67aa3f0b15d5f8122a8f99f5903ec2e2029937c4;hpb=bf5ff1d116840e1330c80894132919ec515596e4

diff --git a/bulletml/impl.py b/bulletml/impl.py
index f0e8964..836fb41 100644
--- a/bulletml/impl.py
+++ b/bulletml/impl.py
@@ -4,7 +4,7 @@ from __future__ import division
 
 from math import atan2, sin, cos
 
-from bulletml import parser
+from bulletml.parser import ActionDef, ActionRef
 
 __all__ = ["Action", "Bullet"]
 
@@ -48,7 +48,8 @@ class Action(object):
         return "%s(pc=%r, actions=%r)" % (
             type(self).__name__, self.pc, self.actions)
 
-    def Child(self, actions, params, rank, repeat=1):
+    def Child(self, action, params, rank, repeat=1):
+        actions, params = action(params, rank)
         return type(self)(self, actions, params, rank, repeat)
 
     def vanish(self):
@@ -73,8 +74,6 @@ class Action(object):
 
     def step(self, owner, created):
         """Advance by one frame."""
-        s_params = self.params
-        rank = owner.rank
 
         if self.speed_frames > 0:
             self.speed_frames -= 1
@@ -100,6 +99,9 @@ class Action(object):
             self.wait_frames -= 1
             return
 
+        s_params = self.params
+        rank = owner.rank
+
         while True:
             self.pc += 1
 
@@ -118,9 +120,8 @@ class Action(object):
                     self.pc = 0
                     action = self.actions[self.pc]
 
-            if isinstance(action, (parser.ActionDef, parser.ActionRef)):
-                actions, params = action(s_params, rank)
-                child = self.__class__(self, actions, params, rank)
+            if isinstance(action, (ActionDef, ActionRef)):
+                child = self.Child(action, s_params, rank)
                 owner.replace(self, child)
                 child.step(owner, created)
                 break
@@ -152,8 +153,7 @@ class Bullet(object):
     """
 
     def __init__(self, x=0, y=0, direction=0, speed=0, target=None,
-                 actions=(), rank=0.5, tags=(), appearance=None,
-                 Action=Action):
+                 actions=(), rank=0.5, tags=(), appearance=None):
         self.x = self.px = x
         self.y = self.py = y
         self.mx = 0
@@ -165,17 +165,18 @@ class Bullet(object):
         self.rank = rank
         self.tags = set(tags)
         self.appearance = appearance
-        # New bullets reset the parent hierarchy.
-        self.actions = [Action(None, action, params, rank)
-                         for action, params in actions]
+        self.actions = list(actions)
 
     @classmethod
     def FromDocument(cls, doc, x=0, y=0, direction=0, speed=0, target=None,
                      params=(), rank=0.5, Action=Action):
         """Construct a new Bullet from a loaded BulletML document."""
-        actions = [a(params, rank) for a in doc.actions]
+        actions = [action(params, rank) for action in doc.actions]
+        # New bullets reset the parent hierarchy.
+        actions = [Action(None, action, params, rank)
+                   for action, params in actions]
         return cls(x=x, y=y, direction=direction, speed=speed,
-                   target=target, actions=actions, rank=rank, Action=Action)
+                   target=target, actions=actions, rank=rank)
 
     def __repr__(self):
         return ("%s(%r, %r, accel=%r, direction=%r, speed=%r, "
@@ -248,9 +249,11 @@ class Bullet(object):
         for action in self.actions:
             action.step(self, created)
 
+        speed = self.speed
+        direction = self.direction
         self.px = self.x
         self.py = self.y
-        self.x += self.mx + sin(self.direction) * self.speed
-        self.y += -self.my + cos(self.direction) * self.speed
+        self.x += self.mx + sin(direction) * speed
+        self.y += -self.my + cos(direction) * speed
 
         return created