source: nagslang/screens/area.py@ 440:9eee96966d88

Last change on this file since 440:9eee96966d88 was 440:9eee96966d88, checked in by Stefano Rivera <stefano@…>, 8 years ago

Add Death event to reduce death code duplication

File size: 9.7 KB
Line 
1"""Display a game area."""
2
3import pygame
4import pymunk
5import pymunk.pygame_util
6
7from nagslang.constants import (
8 COLLISION_TYPE_WALL, COLLISION_TYPE_PLAYER, CALLBACK_COLLIDERS,
9 COLLISION_TYPE_FURNITURE, COLLISION_TYPE_WEREWOLF_ATTACK,
10 CMD_TOGGLE_FORM, CMD_ACTION)
11from nagslang.events import ScreenChange, DoorEvent, QuitEvent, DeathEvent
12from nagslang.level import Level
13from nagslang.screens.base import Screen
14from nagslang.sound import sound
15
16
17class ControlKeys(object):
18 direction_keys = {
19 (0, 1): set([pygame.locals.K_UP, pygame.locals.K_w]),
20 (0, -1): set([pygame.locals.K_DOWN, pygame.locals.K_s]),
21 (-1, 0): set([pygame.locals.K_LEFT, pygame.locals.K_a]),
22 (1, 0): set([pygame.locals.K_RIGHT, pygame.locals.K_d]),
23 }
24
25 attack_keys = set([pygame.locals.K_z, pygame.locals.K_LCTRL])
26
27 command_keys = {
28 pygame.locals.K_c: CMD_TOGGLE_FORM,
29 pygame.locals.K_SPACE: CMD_ACTION,
30 }
31
32 def __init__(self):
33 self.keys_down = set()
34
35 def key_down(self, key):
36 self.keys_down.add(key)
37
38 def key_up(self, key):
39 self.keys_down.discard(key)
40
41 def handle_event(self, ev):
42 if ev.type == pygame.locals.KEYDOWN:
43 self.key_down(ev.key)
44 elif ev.type == pygame.locals.KEYUP:
45 self.key_up(ev.key)
46
47 def get_direction(self):
48 dx, dy = 0, 0
49 for (tx, ty), keys in self.direction_keys.iteritems():
50 if self.keys_down & keys:
51 dx += tx
52 dy += ty
53 return (dx, dy)
54
55 def is_attacking(self):
56 return bool(self.keys_down & self.attack_keys)
57
58 def get_command_key(self, key):
59 return self.command_keys.get(key, None)
60
61
62class Drawables(object):
63 def __init__(self):
64 self._drawables = {}
65
66 def add(self, drawable):
67 self._drawables.setdefault(drawable.zorder, []).append(drawable)
68
69 def remove(self, drawable):
70 self._drawables[drawable.zorder].remove(drawable)
71
72 def get_drawables(self):
73 for zorder in sorted(self._drawables):
74 for drawable in self._drawables[zorder]:
75 yield drawable
76
77 __iter__ = get_drawables
78
79
80class AreaScreen(Screen):
81
82 def setup(self):
83 self._disable_render = False # Avoid redrawing on scene changes
84 self.keys = ControlKeys()
85 self._level = Level(self.name, self.world)
86 self._level.load(self.space)
87 self.game_starting_point = Level.game_starting_point()
88 self._drawables = Drawables()
89 self.add_walls()
90 self._add_collision_handlers()
91 self.add_protagonist()
92 self.add_game_objects()
93 sound.play_music("POL-cyber-factory-short.ogg")
94
95 def teardown(self):
96 sound.stop()
97
98 @classmethod
99 def list_areas(self):
100 return Level.list_levels()
101
102 def _player_collision_pre_solve_handler(self, space, arbiter):
103 gobj = arbiter.shapes[1].physicser.game_object
104 result = gobj.collide_with_protagonist(self.protagonist)
105 # The collision handler must return `True` or `False`. We don't want to
106 # accidentally reject collisions from handlers that return `None`, so
107 # we explicitly check for `False` and treate everything else as `True`.
108 return result is not False
109
110 def _claw_attack_collision_pre_solve_handler(self, space, arbiter):
111 claw = arbiter.shapes[0].physicser.game_object
112 gobj = arbiter.shapes[1].physicser.game_object
113 result = gobj.collide_with_claw_attack(claw)
114 return result is not False
115
116 def _furniture_collision_pre_solve_handler(self, space, arbiter):
117 furniture = arbiter.shapes[0].physicser.game_object
118 gobj = arbiter.shapes[1].physicser.game_object
119 result = gobj.collide_with_furniture(furniture)
120 return result is not False
121
122 def _add_collision_handlers(self):
123 for collision_type in CALLBACK_COLLIDERS:
124 self.space.add_collision_handler(
125 COLLISION_TYPE_PLAYER, collision_type,
126 pre_solve=self._player_collision_pre_solve_handler)
127 self.space.add_collision_handler(
128 COLLISION_TYPE_FURNITURE, collision_type,
129 pre_solve=self._furniture_collision_pre_solve_handler)
130 self.space.add_collision_handler(
131 COLLISION_TYPE_WEREWOLF_ATTACK, collision_type,
132 pre_solve=self._claw_attack_collision_pre_solve_handler)
133
134 def add_walls(self):
135 self.walls = []
136 body = pymunk.Body()
137 body.position = (0, 0)
138 walls = self._level.get_walls()
139 for wall in walls:
140 if len(wall) < 2:
141 # Don't try to add a useless wall
142 continue
143 corners = wall
144 corner = corners[-1]
145 for next_corner in corners:
146 wall = pymunk.Segment(body, corner, next_corner, 5)
147 wall.collision_type = COLLISION_TYPE_WALL
148 wall.elasticity = 1.0
149 self.walls.append(wall)
150 corner = next_corner
151 self.space.add(*self.walls)
152
153 def add_game_objects(self):
154 for drawable in self._level.drawables:
155 self._drawables.add(drawable)
156
157 def add_protagonist(self):
158 self.protagonist = self.world.protagonist
159 self.protagonist.change_space(self.space)
160 self._drawables.add(self.protagonist)
161
162 def handle_event(self, ev):
163 if ev.type == pygame.locals.KEYDOWN:
164 if ev.key == pygame.locals.K_ESCAPE:
165 if self._level.is_starting_level():
166 QuitEvent.post()
167 return
168 self.protagonist.die()
169 return
170 cmd_key = self.keys.get_command_key(ev.key)
171 if cmd_key is not None:
172 self.protagonist.handle_keypress(cmd_key)
173 elif DoorEvent.matches(ev):
174 self.protagonist.set_position(ev.dest_pos)
175 if ev.destination != self.name:
176 # Go to anther screen
177 self._disable_render = True
178 self.world.rooms += 1
179 self.world.level = (ev.destination, ev.dest_pos)
180 self.world.save()
181 ScreenChange.post(ev.destination)
182 return
183 # else we're teleporting within the screen, and just the
184 # position change is enough
185 elif DeathEvent.matches(ev):
186 self._disable_render = True
187 self.world.load()
188 self.world.deaths += 1
189 level, pos = Level.game_starting_point()
190 self.protagonist.set_position(pos)
191 ScreenChange.post(level)
192
193 self.keys.handle_event(ev)
194
195 def _calc_viewport(self, level_surface, display_surface):
196 level_size = level_surface.get_size()
197 display_size = display_surface.get_size()
198 protagnist_pos = self.protagonist.physicser.get_render_position(
199 level_surface)
200 x_wide = display_size[0] // 2
201 y_wide = display_size[1] // 2
202 if display_size[0] > level_size[0]:
203 x = -(display_size[0] - level_size[0]) // 2
204 elif protagnist_pos[0] < x_wide:
205 x = 0
206 elif protagnist_pos[0] > level_size[0] - x_wide:
207 x = level_size[0] - display_size[0]
208 else:
209 x = protagnist_pos[0] - x_wide
210 if display_size[1] > level_size[1]:
211 y = -(display_size[1] - level_size[1]) // 2
212 elif protagnist_pos[1] < y_wide:
213 y = 0
214 elif protagnist_pos[1] > level_size[1] - y_wide:
215 y = level_size[1] - display_size[1]
216 else:
217 y = protagnist_pos[1] - y_wide
218 return pygame.rect.Rect(x, y, display_size[0], display_size[1])
219
220 def render(self, surface):
221 if self._disable_render:
222 return
223 background = self._level.get_background()
224 mysurface = background.copy()
225 for drawable in self._drawables:
226 drawable.render(mysurface)
227 render_rect = self._calc_viewport(mysurface, surface)
228 surface.blit(mysurface, (0, 0), render_rect)
229 # Maximum width we allow for overlays
230 max_width = min(render_rect.width, mysurface.get_width())
231 for overlay in self._level.overlay_drawables:
232 if overlay.is_visible():
233 overlay.render(surface, render_rect.topleft, max_width)
234 self.render_health_bar(surface)
235
236 def tick_protagonist(self):
237 dx, dy = self.keys.get_direction()
238 self.protagonist.set_direction(dx, dy)
239 if self.keys.is_attacking():
240 self._handle_result(self.protagonist.handle_attack_key_down())
241
242 def tick(self, seconds):
243 super(AreaScreen, self).tick(seconds)
244 self.tick_protagonist()
245 for drawable in self._drawables:
246 self._handle_result(drawable.update(seconds))
247
248 def _handle_result(self, result):
249 if result is not None:
250 for drawable in result.add:
251 self._drawables.add(drawable)
252 for drawable in result.remove:
253 self._drawables.remove(drawable)
254
255 def render_health_bar(self, surface, damage_experienced=None):
256 bar_surface = pygame.Surface((110, 50)).convert(surface)
257 if damage_experienced:
258 health_box_colour = pygame.color.THECOLORS['red']
259 else:
260 health_box_colour = pygame.color.THECOLORS['white']
261 bar_surface.fill(health_box_colour)
262 if self.protagonist.in_human_form():
263 health_colour = pygame.color.THECOLORS['red']
264 else:
265 health_colour = pygame.color.THECOLORS['violetred3']
266 rect = pygame.Rect(5, 5, self.protagonist.get_health_level(), 40)
267 pygame.draw.rect(bar_surface, health_colour, rect, 0)
268 bar_surface.set_alpha(192)
269 y_pos = surface.get_height() - 20 - bar_surface.get_height()
270 surface.blit(bar_surface, (20, y_pos))
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