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annotate gamelib/engine.py @ 52:1d3d20bdc8b9

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Move engine stuff into it's own file
author Neil Muller <drnlmuller@gmail.com>
date Mon, 07 May 2012 21:55:55 +0200
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children 7309392d9ca9
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52
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1 # -*- coding: utf-8 -*-
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2 # vim:fileencoding=utf-8 ai ts=4 sts=4 et sw=4
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3
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4
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5 """Game engine stuff"""
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6
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7 import pygame
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8 from pygame.locals import (MOUSEBUTTONDOWN, MOUSEBUTTONUP, MOUSEMOTION, QUIT,
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9 USEREVENT)
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10 from pygame.time import Clock
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11
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12 from gamelib.constants import FPS
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13
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14
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15 class UserEvent(object):
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16 # Handy event wrapper
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17
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18 TYPE = "unknown"
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19
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20 @classmethod
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21 def post(cls, **kw):
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22 event = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kw)
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23 pygame.event.post(event)
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24
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25 @classmethod
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26 def matches(cls, event):
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27 return event.type == USEREVENT and event.utype == cls.TYPE
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28
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29
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30 class AddWindow(UserEvent):
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31 # Add the given window to the top of the window stack
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32
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33 TYPE = "ADD_WINDOW"
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34
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35 @classmethod
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36 def post(cls, window):
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37 super(AddWindow, cls).post(window=window)
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38
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39
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40 class PopWindow(UserEvent):
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41 # Pop a window off the top of the window stack
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42
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43 TYPE = "POP_WINDOW"
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44
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45 @classmethod
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46 def post(cls):
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47 super(PopWindow, cls).post()
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48
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49
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50 class Engine(object):
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51
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52 def __init__(self, screen):
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53 self._window_stack = []
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54 self._running = False
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55 self._mouse_down = False
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56 self._screen = screen
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57
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58 def run(self, window):
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59 clock = Clock()
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60 self._window_stack.append(window)
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61 self._running = True
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62 self._mouse_down = False
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63 while self._running:
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64 self.process_input()
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65 self.draw()
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66 clock.tick(FPS)
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67
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68 def draw(self):
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69 for view in self._window_stack:
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70 view.draw(self._screen)
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71 pygame.display.flip()
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72
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73 def process_input(self):
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74 for event in pygame.event.get():
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75 if self._mouse_down:
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76 if event.type == MOUSEBUTTONUP:
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77 self._mouse_down = False
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78 self._window_stack[-1].on_mouse_up(event.pos)
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79 elif event.type == MOUSEMOTION:
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80 self._window_stack[-1].on_mouse_move(event.pos)
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81 elif not self._mouse_down and event.type == MOUSEBUTTONDOWN:
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82 self._mouse_down = True
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83 self._window_stack[-1].on_mouse_down(event.pos)
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84 elif event.type == QUIT:
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85 self._running = False
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86 elif AddWindow.matches(event):
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87 self._window_stack.append(event.window)
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88 elif PopWindow.matches(event):
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89 self._window_stack.pop()