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annotate pyntnclick/engine.py @ 637:c27087877c84 pyntnclick

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Mouse events propagate! Crashes galore!
author Jeremy Thurgood <firxen@gmail.com>
date Sun, 12 Feb 2012 00:59:49 +0200
parents 660ef5793886
children fdc63049b08c
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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
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9 # We can't do this via our usual UserEvent trickey
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10 # as it gets generated by pygame.music, which only
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11 # takes an event type
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12 MUSIC_ENDED = USEREVENT + 1
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13
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14
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15 class Engine(object):
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16 def __init__(self, game_description):
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17 self._screen = None
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18 self._game_description = game_description
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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
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42 elif ev.type == MUSIC_ENDED:
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43 self._game_description.sound.music_ended()
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44 elif ScreenChangeEvent.matches(ev):
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45 self.set_screen(ev.screen_name)
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46 elif ScreenEvent.matches(ev):
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47 self.screens[ev.screen_name].process_event(ev.event_name,
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48 ev.data)
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49 else:
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50 self._screen.dispatch(ev)
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51 surface = pygame.display.get_surface()
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52 self._screen.draw(surface)
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53 flip()
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54 self._fps = 1000.0 / clock.tick(
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55 self._game_description.constants.frame_rate)
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56
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57
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58 class Screen(object):
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59 """A top level object for the screen being displayed"""
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60
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61 def __init__(self, game_description):
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62 # Avoid import loop
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63 from pyntnclick.widgets.base import Container
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64
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65 self.game_description = game_description
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66 self.resource = game_description.resource
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67
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68 self.surface_size = game_description.constants.screen
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69 self.surface = None
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70 self.container = Container(pygame.Rect((0, 0), self.surface_size))
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71 self.setup()
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72
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73 def on_enter(self):
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74 """Called when this becomes the current screen."""
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75 # Create the surface here as flipping between editor and
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76 # other things kills pygame.display
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77 self.surface = pygame.Surface(self.surface_size)
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78
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79 def on_exit(self):
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80 """Called when this stops being the current screen."""
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81 self.surface = None
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82
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83 def setup(self):
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84 """Override for initialization"""
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85 pass
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86
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87 def dispatch(self, ev):
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88 self.container.event(ev)
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89
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90 def draw_background(self):
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91 self.surface.fill(pygame.Color('gray'))
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92
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93 def draw(self, surface):
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94 if self.surface:
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95 self.draw_background()
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96 self.container.draw(self.surface)
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97 surface.blit(self.surface, self.surface.get_rect())
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98
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99 def display_dialog(self, dialog):
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100 self.container.paused = True
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101 self.container.add(dialog)
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102 dialog.grab_focus()
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103
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104 def change_screen(self, new_screen_name):
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105 ScreenChangeEvent.post(new_screen_name)
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106
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107 def screen_event(self, screen_name, event_name, data=None):
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108 ScreenEvent.post(screen_name, event_name, data)
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109
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110 def process_event(self, event_name, data):
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111 pass
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112
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113
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114 class UserEvent(object):
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115 """A user event type allowing subclassing,
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116 to provide an infinate number of user-defined events
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117 """
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118
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119 TYPE = "UNKNOWN"
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120
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121 @classmethod
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122 def post(cls, **kws):
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123 ev = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kws)
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124 pygame.event.post(ev)
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125
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126 @classmethod
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127 def matches(cls, ev):
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128 return ev.type == USEREVENT and ev.utype == cls.TYPE
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129
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130
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131 class ScreenChangeEvent(UserEvent):
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132
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133 TYPE = "SCREEN_CHANGE"
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134
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135 @classmethod
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136 def post(cls, screen_name):
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137 super(ScreenChangeEvent, cls).post(screen_name=screen_name)
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138
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139
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140 class ScreenEvent(UserEvent):
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141
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142 TYPE = "SCREEN_EVENT"
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143
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144 @classmethod
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145 def post(cls, screen_name, event_name, data):
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146 super(ScreenEvent, cls).post(screen_name=screen_name,
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147 event_name=event_name, data=data)