From 72d08f5c5c38da987a496f344e88e51fb956d6a6 Mon Sep 17 00:00:00 2001
From: Joe Wreschnig <joe.wreschnig@gmail.com>
Date: Thu, 18 Mar 2010 01:36:08 -0700
Subject: [PATCH] If a ChangeDirection, ChangeSpeed, Accel, or Wait action
 takes 0 frames, do it immediately and continue.

---
 bulletml/impl.py | 36 +++++++++++++++++++++++++++---------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/bulletml/impl.py b/bulletml/impl.py
index f3d7e12..8508896 100644
--- a/bulletml/impl.py
+++ b/bulletml/impl.py
@@ -172,7 +172,12 @@ class Action(object):
             elif isinstance(action, parser.ChangeSpeed):
                 frames, (speed, type) = action(s_params, rank)
                 self.speed_frames = frames
-                if type == "sequence":
+                if frames <= 0:
+                    if type == "absolute":
+                        owner.speed = speed
+                    elif type == "relative":
+                        owner.speed += speed
+                elif type == "sequence":
                     self.speed = speed
                 elif type == "relative":
                     self.speed = speed / frames
@@ -188,21 +193,28 @@ class Action(object):
                 else:
                     if type == "absolute":
                         direction -= owner.direction
-                    elif type == "relative":
-                        direction = direction
-                    else:
+                    elif type != "relative": # aim or default
                         self.aiming = True
                         direction += owner.aim - owner.direction
 
-                    self.direction = (
-                        (direction + math.pi) % PI_2 - math.pi) / frames
+                    # Normalize to [-pi, pi).
+                    direction = (direction + math.pi) % PI_2 - math.pi
+                    if frames <= 0:
+                        owner.direction += direction
+                    else:
+                        self.direction = direction / frames
 
             elif isinstance(action, parser.Accel):
                 frames, horizontal, vertical = action(s_params, rank)
                 self.accel_frames = frames
                 if horizontal:
                     mx, type = horizontal
-                    if type == "sequence":
+                    if frames <= 0:
+                        if type == "absolute":
+                            owner.mx = mx
+                        elif type == "relative":
+                            owner.mx += mx
+                    elif type == "sequence":
                         self.mx = mx
                     elif type == "absolute":
                         self.mx = (mx - owner.mx) / frames
@@ -210,7 +222,12 @@ class Action(object):
                         self.mx = mx / frames
                 if vertical:
                     my, type = vertical
-                    if type == "sequence":
+                    if frames <= 0:
+                        if type == "absolute":
+                            owner.my = my
+                        elif type == "relative":
+                            owner.my += my
+                    elif type == "sequence":
                         self.my = my
                     elif type == "absolute":
                         self.my = (my - owner.my) / frames
@@ -228,7 +245,8 @@ class Action(object):
 
             elif isinstance(action, parser.Wait):
                 self.wait_frames = action(s_params, rank)
-                break
+                if self.wait_frames:
+                    break
 
             elif isinstance(action, parser.Vanish):
                 owner.vanish()
-- 
2.20.1