Coverage for src/gncpy/game_engine/base_game.py: 0%
209 statements
« prev ^ index » next coverage.py v7.2.7, created at 2023-07-19 05:48 +0000
1"""Defines base game engine classes.
3These define common functions, properties, and interfaces for all games.
4"""
5from abc import ABC, abstractmethod
6import os
7import pathlib
8import numpy as np
9from ruamel.yaml import YAML
11import gncpy.game_engine.rendering2d as grender2d
12import gncpy.game_engine.components as gcomp
13from gncpy.game_engine.rendering2d import Shape2dParams
14from gncpy.game_engine.physics2d import Physics2dParams, Collision2dParams
15from gncpy.game_engine.entities import EntityManager
18yaml = YAML()
19"""Global yaml interpretter, should be used when parsing any came configs."""
22def ndarray_representer(dumper, data):
23 return dumper.represent_list(data.tolist())
26class WindowParams:
27 """Parameters of the game window to be parsed by the yaml parser.
29 The types defined in this class determine what type the parser uses.
31 Attributes
32 ----------
33 width : int
34 Width of the window in pixels.
35 height : int
36 Height of the window in pixels.
37 """
39 def __init__(self):
40 super().__init__()
41 self.width = 0
42 self.height = 0
45class BaseParams:
46 """Main parameter class, may be inherited from to add custom attributes.
48 Attributes
49 ----------
50 window : :class:`.WindowParams`
51 Parameters of the window.
52 """
54 def __init__(self):
55 super().__init__()
56 self.window = WindowParams()
59class Base2dParams(BaseParams):
60 """Base parameters for 2d games, can be inherited from.
62 Attributes
63 ----------
64 physics : :class:`.physics2d.Physics2dParams`
65 Physics system parameters.
66 start_time : float
67 Starting time in game.
68 max_time : float
69 Maximum time for the game to run. The default is infinity if not set
70 in the config file. To manually set unlimited time then supply a negative
71 value in the config file.
72 """
74 def __init__(self):
75 super().__init__()
76 self.physics = Physics2dParams()
77 self.start_time = 0.0
78 self.max_time = float("inf")
81class BaseGame(ABC):
82 """Base class for defining games.
84 This should implement all the necessary systems (i.e. game logic) by operating
85 on entities. It must be subclassed and defines the expected interface of games.
87 Attributes
88 ----------
89 config_file : string
90 Full file path of the configuration file.
91 entityManager : :class:`.entities.EntityManager`
92 Factory class for making and managing game entities.
93 render_mode : string
94 Method of rendering the game.
95 render_fps : int
96 Frame rate to render the game at.
97 current_frame : int
98 Number of the current frame.
99 score : float
100 Score accumulated in the game.
101 game_over : bool
102 Flag indicating if the game has ended.
103 params : :class:`BaseParams`
104 Parameters for the game, read from yaml file.
105 rng : numpy random generator
106 Random number generator.
107 seed_val : int
108 Optional seed used in the random generator.
109 library_dir : string
110 Default directory to look for config files defined by the package.
111 This is useful when extending this class outside of the gncpy
112 package to provide a new default search location. The default of
113 None is good for most other cases.
114 """
116 def __init__(
117 self,
118 config_file,
119 render_mode,
120 render_fps=None,
121 use_library_config=False,
122 seed=None,
123 rng=None,
124 library_dir=None,
125 ):
126 """Initialize the object.
128 Parameters
129 ----------
130 config_file : string
131 Full path of the configuration file. This can be the name of a one
132 of the libraries default files but the use_library_config flag
133 should also be set.
134 render_mode : string
135 Mode to render the game.
136 render_fps : int, optional
137 FPS to render the game at. The default is None.
138 use_library_config : bool, optional
139 Flag indicating if the config file is in the default library location.
140 The default is False.
141 seed : int, optional
142 Seed for the random number generator. The default is 0.
143 rng : numpy random generator, optional
144 Instance of the random generator to use. The default is None and will
145 cause one to be created.
146 library_dir : string, optional
147 Default directory to look for config files defined by the package.
148 This is useful when extending this class outside of the gncpy
149 package to provide a new default search location. The default of
150 None is good for most other cases.
151 """
152 super().__init__()
153 if library_dir is None:
154 self.library_config_dir = os.path.join(
155 pathlib.Path(__file__).parent.parent.resolve(), "games", "configs"
156 )
157 else:
158 self.library_config_dir = library_dir
160 self.config_file = self.validate_config_file(
161 config_file, use_library=use_library_config
162 )
163 self.entityManager = EntityManager()
164 self.render_mode = render_mode
165 self.render_fps = render_fps
166 self.current_frame = -1
167 self.score = 0
168 self.game_over = False
169 self.params = None
170 if rng is not None:
171 self.rng = rng
172 elif seed is not None:
173 self.rng = np.random.default_rng(seed)
174 else:
175 self.rng = np.random.default_rng()
177 self.seed_val = seed
179 def setup(self):
180 """Sets up the game by parsing the config file and checking max time.
182 This should be called before any other game functions. It should be
183 extended by child classes. If overridden then the developer is responsible
184 for registering the parameters for the yaml parsing and parsing the config
185 file.
186 """
187 global yaml
188 self.register_params(yaml)
190 self.parse_config_file()
191 if self.params.max_time < 0:
192 self.params.max_time = float("inf")
194 def register_params(self, yaml):
195 """Register classes with the yaml parser.
197 This should be extended by inherited classes.
199 Parameters
200 ----------
201 yaml : ruamel.yaml YAML object
202 yaml parser to use, should be the global parser.
203 """
204 yaml.representer.add_representer(np.ndarray, ndarray_representer)
205 yaml.register_class(WindowParams)
206 yaml.register_class(BaseParams)
208 def validate_config_file(self, config_file, use_library):
209 """Validate that the config file exists.
211 First checks if the file exists as provided, then checks the library
212 directory if the use_library flag is true or it failed to find the file
213 as provided.
215 Parameters
216 ----------
217 config_file : string
218 Full path to the config file.
219 use_library : bool
220 Flag indicating if the library directory will be checked.
222 Raises
223 ------
224 FileNotFoundError
225 If the file cannot be found.
227 Returns
228 -------
229 cf : string
230 full path to the config file that was found.
231 """
232 succ = os.path.isfile(config_file)
233 if use_library or not succ:
234 cf = os.path.join(self.library_config_dir, config_file)
235 succ = os.path.isfile(cf)
236 else:
237 cf = config_file
239 if not succ:
240 raise FileNotFoundError("Failed to find config file {}".format(config_file))
242 return cf
244 def parse_config_file(self):
245 """Parses the config file and saves the parameters."""
246 builtins = (int, float, bool, str, dict)
248 def helper(item):
249 """Set default class values before being overriding from file."""
250 item_cls = type(item)
251 if item_cls in builtins or item_cls == tuple:
252 return item
253 true_item = item_cls()
254 for field in dir(item):
255 if field[0:2] == "__" or field[0] == "_":
256 continue
257 # skip properties, assume they are read only
258 try:
259 if isinstance(getattr(item_cls, field), property):
260 continue
261 except AttributeError:
262 pass
263 val = getattr(item, field)
264 if callable(val):
265 continue
266 val_type = type(getattr(true_item, field))
267 if val_type in builtins:
268 setattr(true_item, field, val)
269 elif val_type == list:
270 if not isinstance(val, list):
271 val = list([val,]) # noqa
272 lst = []
273 for lst_item in val:
274 lst.append(helper(lst_item))
275 setattr(true_item, field, lst)
276 elif val_type == tuple:
277 if not isinstance(val, tuple):
278 val = tuple(val)
279 setattr(true_item, field, val)
280 elif val_type == np.ndarray:
281 try:
282 if not isinstance(val, list):
283 val = list([val,]) # noqa
284 arr_val = np.array(val, dtype=float)
285 except ValueError:
286 raise RuntimeError(
287 "Failed to convert {:s} to numpy array ({}).".format(
288 field, val
289 )
290 )
291 setattr(true_item, field, arr_val)
292 else:
293 setattr(true_item, field, helper(val))
295 return true_item
297 with open(self.config_file, "r") as fin:
298 self.params = helper(yaml.load(fin))
300 def reset(self, seed=None, rng=None):
301 """Resets to the base state.
303 If a random generator is provided then that is used. Otherwise the seed
304 value is used to create a new generator. If neither is provided, but a
305 seed had previously been provided then the old seed is used to recreate
306 the generator. If all else fails, then a new default generator is initialized.
308 Parameters
309 ----------
310 seed : int, optional
311 seed for the random number generator. The default is None.
312 rng : numpy random generator, optional
313 Instance of the random number generator to use. The default is None.
314 """
315 self.entityManager = EntityManager()
316 self.current_frame = 0
317 self.game_over = False
318 self.score = 0
320 if rng is not None:
321 self.rng = rng
322 elif seed is None:
323 if self.seed_val is None:
324 self.rng = np.random.default_rng()
325 else:
326 self.rng = np.random.default_rng(self.seed_val)
327 else:
328 self.rng = np.random.default_rng(seed)
329 self.seed_val = seed
331 @abstractmethod
332 def s_movement(self, action):
333 """Abstract method for moving entities according to their dynamics.
335 Parameters
336 ----------
337 action : numpy array, int, bool, dict, etc.
338 action to take in the game.
339 """
340 raise NotImplementedError()
342 @abstractmethod
343 def s_collision(self):
344 """Abstract method to check for collisions between entities.
346 May return extra info useful by the step function.
347 """
348 raise NotImplementedError()
350 @abstractmethod
351 def s_game_over(self):
352 """Abstract method to check for game over conditions."""
353 raise NotImplementedError()
355 @abstractmethod
356 def s_score(self):
357 """Abstact method to calculate the score.
359 Returns
360 -------
361 info : dict
362 Extra info for debugging.
363 """
364 raise NotImplementedError()
366 @abstractmethod
367 def s_input(self, *args):
368 """Abstract method to turn user inputs into game actions."""
369 raise NotImplementedError()
371 @abstractmethod
372 def step(self, *args):
373 """Abstract method defining what to do each frame.
375 Returns
376 -------
377 info : dict
378 Extra infomation for debugging.
379 """
380 raise NotImplementedError
383class BaseGame2d(BaseGame):
384 """Base class for defining 2d games.
386 This should implement all the necessary systems (i.e. game logic) by operating
387 on entities. It assumes the rendering will be done by pygame.
389 Attributes
390 ----------
391 clock : pygame clock
392 Clock for the rendering system.
393 window : pygame window
394 Window for drawing to.
395 img : H x W x 3 numpy array
396 Pixel values of the screen image.
397 current_update_count : int
398 Number of update steps taken, this may be more than the frame count as
399 multiple physics updates may be made per frame.
400 dist_per_pix : numpy array
401 Real distance per pixel in x (width) and y (height) order.
402 """
404 def __init__(self, config_file, render_mode, **kwargs):
405 super().__init__(config_file, render_mode, **kwargs)
406 self.clock = None
407 self.window = None
408 self.img = np.array([])
409 self.current_update_count = -1
410 self.dist_per_pix = np.array([]) # width, height
412 @property
413 def current_time(self):
414 """Current time in real units."""
415 return self.elapsed_time + self.params.start_time
417 @property
418 def elapsed_time(self):
419 """Amount of time elapsed in game in real units."""
420 return self.params.physics.update_dt * self.current_update_count
422 def setup(self):
423 """Sets up the game and should be called before any game functions.
425 Sets up the physics and rendering system and resets to the base state.
426 """
427 super().setup()
429 # update render fps if not set
430 if self.render_fps is None:
431 self.render_fps = 1 / self.params.physics.dt
433 self.clock = grender2d.init_rendering_system()
434 self.window = grender2d.init_window(
435 self.render_mode, self.params.window.width, self.params.window.height
436 )
438 self.dist_per_pix = np.array(
439 [
440 self.params.physics.dist_width / self.window.get_width(),
441 self.params.physics.dist_height / self.window.get_height(),
442 ]
443 )
445 self.reset()
447 def register_params(self, yaml):
448 """Register custom classes for this game with the yaml parser.
450 Parameters
451 ----------
452 yaml : ruamel.yaml YAML object
453 yaml parser to use, should be the global parser.
454 """
455 super().register_params(yaml)
456 yaml.register_class(Shape2dParams)
457 yaml.register_class(Collision2dParams)
458 yaml.register_class(Physics2dParams)
459 yaml.register_class(Base2dParams)
461 def get_image_size(self):
462 """Gets the size of the window.
464 Returns
465 -------
466 tuple
467 first is the height next is the width, in pixels.
468 """
469 sz = self.window.get_size()
470 return sz[1], sz[0]
472 def append_name_to_keys(self, in_dict, prefix):
473 """Append a prefix to every key in a dictionary.
475 A dot is placed between the prefix and the original key.
477 Parameters
478 ----------
479 in_dict : dict
480 Original dictionary.
481 prefix : string
482 string to prepend.
484 Returns
485 -------
486 out : dict
487 updated dictionary.
488 """
489 out = {}
490 for key, val in in_dict.items():
491 n_key = "{:s}.{:s}".format(prefix, key)
492 out[n_key] = val
493 return out
495 def reset(self, **kwargs):
496 """Resets to the base state."""
497 super().reset(**kwargs)
498 self.img = 255 * np.ones((*self.get_image_size(), 3), dtype=np.uint8)
499 self.current_update_count = 0
501 def step(self, user_input):
502 """Perform one iteration of the game loop.
504 Multiple physics updates can be made between rendering calls.
506 Parameters
507 ----------
508 user_input : dict
509 Each key is an integer representing the entity id that the action
510 applies to. Each value is an action to take.
512 Returns
513 -------
514 info : dict
515 Extra infomation for debugging.
516 """
517 info = {}
518 self.current_frame += 1
520 self.score = 0
521 reached_target = False
522 for ii in range(self.params.physics.step_factor):
523 self.current_update_count += 1
524 self.entityManager.update()
526 # clear events for entities
527 for e in self.entityManager.get_entities():
528 if e.has_component(gcomp.CEvents):
529 e.get_component(gcomp.CEvents).events = []
531 action = self.s_input(user_input)
532 self.s_movement(action)
533 hit_tar = self.s_collision()
534 reached_target = reached_target or hit_tar
535 self.s_game_over()
536 score, s_info = self.s_score()
537 self.score += score
538 self.score /= self.params.physics.step_factor
540 info["reached_target"] = reached_target
542 self.s_render()
544 info.update(self.append_name_to_keys(s_info, "Reward"))
546 return info
548 def s_render(self):
549 """Render a frame of the game."""
550 self.img = grender2d.render(
551 grender2d.get_drawable_entities(self.entityManager.get_entities()),
552 self.window,
553 self.clock,
554 self.render_mode,
555 self.render_fps,
556 )
558 def close(self):
559 """Shutdown the rendering system."""
560 grender2d.shutdown(self.window)