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annotate nagslang/screens/area.py @ 105:0131e4606e1a

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List of drawables in area.
author Jeremy Thurgood <firxen@gmail.com>
date Mon, 02 Sep 2013 13:29:30 +0200
parents 96bdfadeb461
children bce9cd8a4a8c
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1 """Display a game area."""
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2
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3 import pygame
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4 import pymunk
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5 import pymunk.pygame_util
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7 from nagslang.events import ScreenChange
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8 from nagslang.game_object import FloorSwitch
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9 from nagslang.level import Level
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10 from nagslang.protagonist import Protagonist
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11 from nagslang.screens.base import Screen
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13
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14 class ControlKeys(object):
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15 direction_keys = {
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16 (0, 1): set([pygame.locals.K_UP, pygame.locals.K_w]),
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17 (0, -1): set([pygame.locals.K_DOWN, pygame.locals.K_s]),
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18 (-1, 0): set([pygame.locals.K_LEFT, pygame.locals.K_a]),
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19 (1, 0): set([pygame.locals.K_RIGHT, pygame.locals.K_d]),
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20 }
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21
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22 def __init__(self):
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23 self.keys_down = set()
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24
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25 def key_down(self, key):
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26 self.keys_down.add(key)
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27
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28 def key_up(self, key):
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29 self.keys_down.discard(key)
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30
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31 def handle_event(self, ev):
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32 if ev.type == pygame.locals.KEYDOWN:
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33 self.key_down(ev.key)
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34 elif ev.type == pygame.locals.KEYUP:
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35 self.key_up(ev.key)
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36
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37 def get_direction(self):
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38 dx, dy = 0, 0
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39 for (tx, ty), keys in self.direction_keys.iteritems():
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40 if self.keys_down & keys:
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41 dx += tx
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42 dy += ty
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43 return (dx, dy)
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44
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45
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46 class AreaScreen(Screen):
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47
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48 def setup(self):
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49 self.keys = ControlKeys()
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50 self._level = Level(self.name)
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51 self._level.load()
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52 self._drawables = []
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53 self.add_walls()
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54 self.add_protagonist()
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55 # TODO: Put this in a level instead:
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56 self._drawables.append(FloorSwitch(self.space, (300, 400)))
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57
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58 def add_walls(self):
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59 self.walls = []
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60 body = pymunk.Body()
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61 body.position = (0, 0)
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62 walls = self._level.get_walls()
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63 for wall in walls:
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64 corners = wall
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65 corner = corners[-1]
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66 for next_corner in corners:
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67 wall = pymunk.Segment(body, corner, next_corner, 5)
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68 wall.elasticity = 1.0
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69 self.walls.append(wall)
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70 corner = next_corner
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71 self.space.add(*self.walls)
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72
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73 def add_protagonist(self):
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74 self.protagonist = Protagonist(self.space, (350, 300))
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75 self._drawables.append(self.protagonist)
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76
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77 def handle_event(self, ev):
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78 if ev.type == pygame.locals.KEYDOWN:
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79 if ev.key == pygame.locals.K_ESCAPE:
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80 ScreenChange.post('menu')
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81 if ev.key == pygame.locals.K_c:
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82 self.protagonist.toggle_form()
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83 self.keys.handle_event(ev)
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85 def _calc_viewport(self, level_surface, display_surface):
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86 level_size = level_surface.get_size()
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87 display_size = display_surface.get_size()
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88 protagnist_pos = self.protagonist.physicser.get_render_position(
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89 level_surface)
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90 x_wide = display_size[0] // 2
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91 y_wide = display_size[1] // 2
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92 if protagnist_pos[0] < x_wide:
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93 x = 0
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94 elif protagnist_pos[0] > level_size[0] - x_wide:
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95 x = level_size[0] - display_size[0]
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96 else:
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97 x = protagnist_pos[0] - x_wide
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98 if protagnist_pos[1] < y_wide:
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99 y = 0
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100 elif protagnist_pos[1] > level_size[1] - y_wide:
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101 y = level_size[1] - display_size[1]
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102 else:
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103 y = protagnist_pos[1] - y_wide
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104 return pygame.rect.Rect(x, y, display_size[0], display_size[1])
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105
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106 def render(self, surface):
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107 #surface.fill(pygame.color.Color(0, 0, 0))
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108 background = self._level.get_background()
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109 mysurface = background.copy()
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110 for drawable in self._drawables:
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111 drawable.render(mysurface)
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112 render_rect = self._calc_viewport(mysurface, surface)
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113 surface.blit(mysurface, (0, 0), render_rect)
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114
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115 def tick_protagonist(self):
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116 dx, dy = self.keys.get_direction()
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117 self.protagonist.set_direction(dx, dy)
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118
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119 def tick(self, seconds):
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120 self.tick_protagonist()
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121 super(AreaScreen, self).tick(seconds)