Mercurial > mamba
annotate mamba/engine.py @ 185:b93845471311
Add SnakeDiedEvent
author | Neil Muller <drnlmuller@gmail.com> |
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date | Wed, 14 Sep 2011 16:26:52 +0200 |
parents | 8502e422cefc |
children | c35e22dc225a |
rev | line source |
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12 | 1 """Game engine and top-level game loop.""" |
2 | |
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3 from mamba.constants import SCREEN, FPS |
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4 from mamba.widgets.base import Container |
38 | 5 |
12 | 6 import pygame.event |
7 import pygame.display | |
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8 import pygame.time |
38 | 9 import pygame |
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10 from pygame.locals import QUIT, USEREVENT |
12 | 11 |
12 | |
13 class Engine(object): | |
14 def __init__(self): | |
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15 self._habitat = None |
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16 self._fps = FPS |
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17 |
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18 def set_habitat(self, habitat): |
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19 if self._habitat is not None: |
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20 self._habitat.on_exit() |
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21 self._habitat = habitat |
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22 if self._habitat is not None: |
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23 self._habitat.on_enter() |
12 | 24 |
25 def run(self): | |
26 """Game loop.""" | |
27 get_events = pygame.event.get | |
28 flip = pygame.display.flip | |
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29 clock = pygame.time.Clock() |
12 | 30 while True: |
31 events = get_events() | |
32 for ev in events: | |
33 if ev.type is QUIT: | |
34 return | |
61 | 35 elif NewHabitatEvent.matches(ev): |
36 self.set_habitat(ev.habitat) | |
37 else: | |
38 self._habitat.dispatch(ev) | |
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39 surface = pygame.display.get_surface() |
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40 self._habitat.draw(surface) |
12 | 41 flip() |
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42 self._fps = 1000.0 / clock.tick(FPS) |
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43 |
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44 |
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45 class Habitat(object): |
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46 |
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47 def __init__(self, size=SCREEN): |
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48 self.surface_size = size |
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49 self.surface = None |
106 | 50 self.container = Container(pygame.Rect((0, 0), self.surface_size)) |
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51 |
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52 def on_enter(self): |
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53 """Called when this becomes the current habitat.""" |
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54 # Create the surface here as flipping between editor and |
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55 # other things kills pygame.display |
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56 self.surface = pygame.Surface(self.surface_size) |
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57 |
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58 def on_exit(self): |
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59 """Called when this stops being the current habitat.""" |
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60 self.surface = None |
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61 |
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62 def dispatch(self, ev): |
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63 self.container.event(ev) |
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64 |
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65 def draw(self, surface): |
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66 if self.surface: |
152 | 67 self.surface.fill(pygame.Color('gray')) |
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68 self.container.draw(self.surface) |
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69 surface.blit(self.surface, self.surface.get_rect()) |
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70 |
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71 |
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72 class UserEvent(object): |
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73 |
61 | 74 TYPE = "UNKNOWN" |
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75 |
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76 @classmethod |
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77 def post(cls, **kws): |
61 | 78 ev = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kws) |
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79 pygame.event.post(ev) |
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80 |
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81 @classmethod |
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82 def matches(cls, ev): |
61 | 83 return ev.type is USEREVENT and ev.utype == cls.TYPE |
84 | |
85 | |
86 class NewHabitatEvent(UserEvent): | |
87 | |
88 TYPE = "NEW_HABITAT" | |
89 | |
90 @classmethod | |
91 def post(cls, habitat): | |
62 | 92 super(NewHabitatEvent, cls).post(habitat=habitat) |
185 | 93 |
94 | |
95 class SnakeDiedEvent(UserEvent): | |
96 | |
97 TYPE = "SNAKE_DIED" | |
98 | |
99 @classmethod | |
100 def post(cls): | |
101 super(SnakeDiedEvent, cls).post() |