bulletml/impl.py

   1 """BulletML implementation.
   2
   3 http://www.asahi-net.or.jp/~cs8k-cyu/bulletml/index_e.html
   4 """
   5
   6 from __future__ import division
   7
   8 import math
   9
  10 from bulletml import parser, errors
  11
  12 # TODO(jfw): This is very non-Pythonic, it's pretty much just the
  13 # BulletML reference ActionImpl translated to Python.
  14
  15 class Action(object):
  16     """Running action implementation."""
  17
  18     def __init__(self, owner, parent, actions, params, rank):
  19         self.actions = actions
  20         self.parent = parent
  21         self.repeat = 0
  22         self.wait_frames = 0
  23         self.speed = 0
  24         self.speed_frames = 0
  25         self.aim_direction = 0
  26         self.direction = 0
  27         self.direction_frames = 0
  28         self.aiming = False
  29         self.aim_mx = 0
  30         self.aim_my = 0
  31         self.mx = 0
  32         self.my = 0
  33         self.owner = owner
  34         self.accel_frames = 0
  35         self.previous_fire_direction = 0
  36         self.previous_fire_speed = 0
  37         self.params = params
  38         self.rank = rank
  39         self.pc = -1
  40         if parent:
  41             self.copy_state(parent)
  42
  43     def vanish(self):
  44         if self.parent:
  45             self.parent.vanish()
  46         self.repeat = 0
  47         self.pc = None
  48
  49     def copy_state(self, other):
  50         self.direction_frames = other.direction_frames
  51         self.direction = other.direction
  52         self.aiming = other.aiming
  53         self.speed_frames = other.speed_frames
  54         self.speed = other.speed
  55         self.accel_frames = other.accel_frames
  56         self.mx = other.mx
  57         self.my = other.my
  58         self.previous_fire_direction = other.previous_fire_direction
  59         self.previous_fire_speed = other.previous_fire_speed
  60
  61     def step(self):
  62         created = []
  63
  64         if self.speed_frames > 0:
  65             self.speed_frames -= 1
  66             self.owner.speed += self.speed
  67         if self.direction_frames > 0:
  68             self.direction_frames -= 1
  69             if self.direction_frames <= 0:
  70                 if self.aiming:
  71                     self.owner.direction += self.owner.aim
  72             else:
  73                 self.owner.direction += self.direction
  74         if self.accel_frames > 0:
  75             self.accel_frames -= 1
  76             self.owner.mx += self.mx
  77             self.owner.my += self.my
  78
  79         if self.pc is None:
  80             return created
  81
  82         if self.wait_frames > 0:
  83             self.wait_frames -= 1
  84             return created
  85
  86         while True:
  87             self.pc += 1
  88             if self.pc >= len(self.actions):
  89                 self.repeat -= 1
  90                 if self.repeat <= 0:
  91                     self.pc = None
  92                     if self.parent is not None:
  93                         self.parent.copy_state(self)
  94                     self.owner.replace(self, self.parent)
  95                     break
  96                 else:
  97                     self.pc = 0
  98
  99             action = self.actions[self.pc]
 100
 101             if isinstance(action, parser.Repeat):
 102                 repeat, (actions, params) = action(self.params, self.rank)
 103                 child = Action(self.owner, self, actions, params, self.rank)
 104                 child.repeat = repeat
 105                 self.owner.replace(self, child)
 106                 created.extend(child.step())
 107                 break
 108
 109             elif isinstance(action, (parser.ActionDef, parser.ActionRef)):
 110                 actions, params = action(self.params, self.rank)
 111                 child = Action(self.owner, self, actions, params, self.rank)
 112                 self.owner.replace(self, child)
 113                 created.extend(child.step())
 114                 break
 115
 116             elif isinstance(action, (parser.FireDef, parser.FireRef)):
 117                 direction, speed, actions = action(self.params, self.rank)
 118                 if direction:
 119                     direction, type = direction
 120                     if type == "aim" or type is None:
 121                         direction += self.owner.aim
 122                     elif type == "sequence":
 123                         direction += self.previous_fire_direction
 124                     elif type == "relative":
 125                         direction += self.owner.direction
 126                 else:
 127                     direction = self.owner.aim
 128                 self.previous_fire_direction = direction
 129
 130
 131                 if speed:
 132                     speed, type = speed
 133                     if type == "sequence":
 134                         speed += self.previous_fire_speed
 135                     elif type == "relative":
 136                         # FIXME(jfw): Reference impl uses prvFireSpeed
 137                         # here?  That doesn't seem right at all.
 138                         speed += self.owner.speed
 139                 else:
 140                     speed = 1
 141                 self.previous_fire_speed = speed
 142
 143                 bullet = Bullet(self.owner.x, self.owner.y, direction, speed,
 144                                 self.owner.target, actions, self)
 145                 created.append(bullet)
 146
 147             elif isinstance(action, parser.ChangeSpeed):
 148                 frames, (speed, type) = action(self.params, self.rank)
 149                 self.speed_frames = frames
 150                 if type == "sequence":
 151                     self.speed = speed
 152                 elif type == "relative":
 153                     self.speed = speed / frames
 154                 else:
 155                     self.speed = (speed - self.owner.speed) / frames
 156
 157             elif isinstance(action, parser.ChangeDirection):
 158                 frames, (direction, type) = action(self.params, self.rank)
 159                 self.direction_frames = frames
 160                 self.aiming = False
 161                 if type == "sequence":
 162                     self.aiming = False
 163                     self.direction = direction
 164                 else:
 165                     if type == "absolute":
 166                         self.aiming = False
 167                         self.direction = (
 168                             direction - self.owner.direction) % 360
 169                     elif type == "relative":
 170                         self.aiming = False
 171                         self.direction = direction
 172                     else:
 173                         self.aiming = True
 174                         self.direction = (
 175                             direction
 176                             + self.owner.aim
 177                             - self.owner.direction) % 360
 178
 179                     while self.direction > 180:
 180                         self.direction -= 360
 181                     while self.direction < -180:
 182                         self.direction += 360
 183                     self.direction /= self.direction_frames
 184
 185             elif isinstance(action, parser.Accel):
 186                 frames, horizontal, vertical = action(self.params, self.rank)
 187                 self.accel_frames = frames
 188                 if horizontal:
 189                     mx, type = horizontal
 190                     if type == "sequence":
 191                         self.mx = mx
 192                     elif type == "absolute":
 193                         self.mx = (mx - self.owner.mx) / frames
 194                     elif type == "relative":
 195                         self.mx = mx / frames
 196                 if vertical:
 197                     my, type = vertical
 198                     if type == "sequence":
 199                         self.my = my
 200                     elif type == "absolute":
 201                         self.my = (my - self.owner.my) / frames
 202                     elif type == "relative":
 203                         self.my = my / frames
 204
 205             elif isinstance(action, parser.Wait):
 206                 self.wait_frames = action(self.params, self.rank)
 207                 break
 208
 209             elif isinstance(action, parser.Vanish):
 210                 self.owner.vanish()
 211                 break
 212
 213         return created
 214
 215 class Bullet(object):
 216     """Simple bullet implementation."""
 217
 218     def __init__(self, x=0, y=0, direction=0, speed=0, target=None,
 219                  actions=(), parent=None, rank=None):
 220         self.x = self.px = x
 221         self.y = self.py = y
 222         self.mx = 0
 223         self.my = 0
 224         self.direction = direction
 225         self.speed = speed
 226         self.vanished = False
 227         self.target = target
 228         self.actions = []
 229         if rank is None:
 230             rank = parent.rank if parent else 0.5
 231         for action, params in actions:
 232             self.actions.append(
 233                 Action(self, parent, action, params, rank))
 234
 235     def __repr__(self):
 236         return ("%s(%r, %r, accel=%r, direction=%r, speed=%r, "
 237                 "actions=%r, target=%r, vanished=%r)") % (
 238             type(self).__name__, self.x, self.y, (self.mx, self.my),
 239             self.direction, self.speed, self.actions, self.target,
 240             self.vanished)
 241
 242     @property
 243     def aim(self):
 244         """Angle to the target."""
 245         if self.target is None:
 246             return self.direction
 247         else:
 248             return math.degrees(
 249                 math.atan2(self.target.x - self.x, self.target.y - self.y))
 250
 251     @property
 252     def finished(self):
 253         return self.vanished and not self.actions
 254
 255     def vanish(self):
 256         """Vanish this bullet and stop all actions."""
 257         self.vanished = True
 258         for action in self.actions:
 259             action.vanish()
 260         self.actions = []
 261
 262     def replace(self, old, new):
 263         try:
 264             idx = self.actions.index(old)
 265         except ValueError:
 266             pass
 267         else:
 268             self.actions[idx] = new
 269
 270     def step(self):
 271         created = []
 272
 273         self.actions = filter(None, self.actions)
 274
 275         for action in self.actions:
 276             created.extend(action.step())
 277
 278         direction = math.radians(self.direction)
 279         self.x += self.mx + math.sin(direction) * self.speed
 280         self.y += self.my + math.cos(direction) * self.speed
 281
 282         return created
 283
 284     @classmethod
 285     def FromDoc(cls, doc, params=(), x=0, y=0, speed=0, direction=0,
 286                 target=None, rank=0.5):
 287         actions = [act(params, rank) for act in doc.top]
 288         return cls(x, y, direction, speed, target, actions, rank=rank)
 289