Mercurial > boomslang
annotate pyntnclick/engine.py @ 697:4bf13af26d6a pyntnclick
Fix detail loading. Clear display on state changes
author | Neil Muller <neil@dip.sun.ac.za> |
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date | Tue, 14 Feb 2012 17:10:21 +0200 |
parents | 363b603794f5 |
children | 374d96e0b55e |
rev | line source |
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1 """Game engine and top-level game loop.""" |
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2 |
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3 import pygame |
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4 import pygame.event |
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5 import pygame.display |
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6 import pygame.time |
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7 from pygame.locals import QUIT, USEREVENT |
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8 |
629 | 9 # We can't do this via our usual UserEvent trickey |
10 # as it gets generated by pygame.music, which only | |
11 # takes an event type | |
12 MUSIC_ENDED = USEREVENT + 1 | |
13 | |
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14 |
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15 class Engine(object): |
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16 def __init__(self, gd): |
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17 self._screen = None |
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18 self._gd = gd |
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19 self.screens = {} |
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20 |
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21 def set_screen(self, screen_name): |
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22 if self._screen is not None: |
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23 self._screen.on_exit() |
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24 self._screen = self.screens[screen_name] |
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25 if self._screen is not None: |
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26 self._screen.on_enter() |
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27 |
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28 def add_screen(self, name, screen): |
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29 self.screens[name] = screen |
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30 |
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31 def run(self): |
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32 """Game loop.""" |
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33 |
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34 get_events = pygame.event.get |
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35 flip = pygame.display.flip |
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36 clock = pygame.time.Clock() |
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37 while True: |
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38 events = get_events() |
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39 for ev in events: |
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40 if ev.type == QUIT: |
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41 return |
629 | 42 elif ev.type == MUSIC_ENDED: |
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43 self._gd.sound.music_ended() |
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44 elif ScreenChangeEvent.matches(ev): |
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45 self.set_screen(ev.screen_name) |
619 | 46 elif ScreenEvent.matches(ev): |
47 self.screens[ev.screen_name].process_event(ev.event_name, | |
48 ev.data) | |
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49 else: |
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50 self._screen.dispatch(ev) |
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51 # Ping the screen / scene |
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52 self._screen.animate() |
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53 surface = pygame.display.get_surface() |
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54 self._screen.draw(surface) |
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55 flip() |
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56 self._fps = 1000.0 / clock.tick( |
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57 self._gd.constants.frame_rate) |
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58 |
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59 |
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60 class Screen(object): |
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61 """A top level object for the screen being displayed""" |
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62 |
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63 def __init__(self, gd): |
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64 # Avoid import loop |
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65 from pyntnclick.widgets.base import Container |
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66 |
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67 self.gd = gd |
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68 self.resource = gd.resource |
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69 |
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70 self.surface_size = gd.constants.screen |
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71 self.surface = None |
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72 self.container = Container(pygame.Rect((0, 0), self.surface_size), |
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73 self.gd) |
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74 self.setup() |
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75 |
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76 def on_enter(self): |
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77 """Called when this becomes the current screen.""" |
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78 # Create the surface here as flipping between editor and |
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79 # other things kills pygame.display |
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80 self.surface = pygame.Surface(self.surface_size) |
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81 |
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82 def on_exit(self): |
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83 """Called when this stops being the current screen.""" |
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84 self.surface = None |
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85 |
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86 def setup(self): |
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87 """Override for initialization""" |
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88 pass |
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89 |
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90 def dispatch(self, ev): |
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91 self.container.event(ev) |
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92 |
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93 def animate(self): |
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94 """Called every tick - used for peroidic events, etc. |
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95 |
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96 Interested classes are expected to override this""" |
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97 pass |
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98 |
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99 def draw_background(self): |
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100 self.surface.fill(pygame.Color('gray')) |
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101 |
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102 def draw(self, surface): |
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103 if self.surface: |
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104 self.draw_background() |
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105 self.container.draw(self.surface) |
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106 surface.blit(self.surface, self.surface.get_rect()) |
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107 |
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108 def display_dialog(self, dialog): |
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109 self.container.paused = True |
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110 self.container.add(dialog) |
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111 dialog.grab_focus() |
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112 |
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113 def change_screen(self, new_screen_name): |
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114 ScreenChangeEvent.post(new_screen_name) |
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115 |
619 | 116 def screen_event(self, screen_name, event_name, data=None): |
117 ScreenEvent.post(screen_name, event_name, data) | |
118 | |
119 def process_event(self, event_name, data): | |
120 pass | |
121 | |
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122 |
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123 class UserEvent(object): |
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124 """A user event type allowing subclassing, |
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125 to provide an infinate number of user-defined events |
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126 """ |
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127 |
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128 TYPE = "UNKNOWN" |
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129 |
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130 @classmethod |
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131 def post(cls, **kws): |
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132 ev = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kws) |
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133 pygame.event.post(ev) |
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134 |
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135 @classmethod |
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136 def matches(cls, ev): |
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137 return ev.type == USEREVENT and ev.utype == cls.TYPE |
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138 |
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139 |
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140 class ScreenChangeEvent(UserEvent): |
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141 |
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142 TYPE = "SCREEN_CHANGE" |
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143 |
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144 @classmethod |
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145 def post(cls, screen_name): |
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146 super(ScreenChangeEvent, cls).post(screen_name=screen_name) |
619 | 147 |
148 | |
149 class ScreenEvent(UserEvent): | |
150 | |
151 TYPE = "SCREEN_EVENT" | |
152 | |
153 @classmethod | |
154 def post(cls, screen_name, event_name, data): | |
155 super(ScreenEvent, cls).post(screen_name=screen_name, | |
156 event_name=event_name, data=data) |