annotate pyntnclick/engine.py @ 803:bcc9277a23e6 pyntnclick

Refactor widget positioning API. Remove unused widgets
author Stefano Rivera <stefano@rivera.za.net>
date Sun, 27 Jan 2013 14:52:16 +0200
parents 374d96e0b55e
children
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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, 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
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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)
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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 # 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((0, 0), self.gd, self.surface_size)
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73 self.setup()
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74
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75 def on_enter(self):
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76 """Called when this becomes the current screen."""
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77 # Create the surface here as flipping between editor and
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78 # other things kills pygame.display
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79 self.surface = pygame.Surface(self.surface_size)
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80
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81 def on_exit(self):
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82 """Called when this stops being the current screen."""
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83 self.surface = None
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84
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85 def setup(self):
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86 """Override for initialization"""
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87 pass
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88
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89 def dispatch(self, ev):
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90 self.container.event(ev)
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91
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92 def animate(self):
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93 """Called every tick - used for peroidic events, etc.
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94
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95 Interested classes are expected to override this"""
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96 pass
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97
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98 def draw_background(self):
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99 self.surface.fill(pygame.Color('gray'))
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100
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101 def draw(self, surface):
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102 if self.surface:
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103 self.draw_background()
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104 self.container.draw(self.surface)
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105 surface.blit(self.surface, self.surface.get_rect())
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106
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107 def display_dialog(self, dialog):
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108 self.container.paused = True
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109 self.container.add(dialog)
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110 dialog.grab_focus()
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111
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112 def change_screen(self, new_screen_name):
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113 ScreenChangeEvent.post(new_screen_name)
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114
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115 def screen_event(self, screen_name, event_name, data=None):
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116 ScreenEvent.post(screen_name, event_name, data)
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117
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118 def process_event(self, event_name, data):
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119 pass
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120
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121
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122 class UserEvent(object):
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123 """A user event type allowing subclassing,
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124 to provide an infinate number of user-defined events
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125 """
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126
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127 TYPE = "UNKNOWN"
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128
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129 @classmethod
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130 def post(cls, **kws):
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131 ev = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kws)
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132 pygame.event.post(ev)
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133
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134 @classmethod
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135 def matches(cls, ev):
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136 return ev.type == USEREVENT and ev.utype == cls.TYPE
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137
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138
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139 class ScreenChangeEvent(UserEvent):
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140
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141 TYPE = "SCREEN_CHANGE"
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142
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143 @classmethod
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144 def post(cls, screen_name):
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145 super(ScreenChangeEvent, cls).post(screen_name=screen_name)
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146
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147
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148 class ScreenEvent(UserEvent):
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149
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150 TYPE = "SCREEN_EVENT"
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151
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152 @classmethod
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153 def post(cls, screen_name, event_name, data):
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154 super(ScreenEvent, cls).post(screen_name=screen_name,
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155 event_name=event_name, data=data)