source: nagslang/screens/area.py@ 362:d0aeb893967d

Last change on this file since 362:d0aeb893967d was 347:dced49dd9864, checked in by Jeremy Thurgood <firxen@…>, 9 years ago

Health bar transparency.
File size: 9.4 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_ATTACK, CMD_ACTION)
11from nagslang.enemies import DeadEnemy
12from nagslang.events import (
13 ScreenChange, DoorEvent, FireEvent, EnemyDeathEvent, ClawEvent)
14from nagslang.level import Level
15from nagslang.screens.base import Screen
16from nagslang.game_object import Bullet, ClawAttack
17from nagslang.sound import sound
18
19
20class ControlKeys(object):
21 direction_keys = {
22 (0, 1): set([pygame.locals.K_UP, pygame.locals.K_w]),
23 (0, -1): set([pygame.locals.K_DOWN, pygame.locals.K_s]),
24 (-1, 0): set([pygame.locals.K_LEFT, pygame.locals.K_a]),
25 (1, 0): set([pygame.locals.K_RIGHT, pygame.locals.K_d]),
26 }
27
28 command_keys = {
29 pygame.locals.K_c: CMD_TOGGLE_FORM,
30 pygame.locals.K_z: CMD_ATTACK,
31 pygame.locals.K_LCTRL: CMD_ATTACK,
32 pygame.locals.K_SPACE: CMD_ACTION,
33 }
34
35 def __init__(self):
36 self.keys_down = set()
37
38 def key_down(self, key):
39 self.keys_down.add(key)
40
41 def key_up(self, key):
42 self.keys_down.discard(key)
43
44 def handle_event(self, ev):
45 if ev.type == pygame.locals.KEYDOWN:
46 self.key_down(ev.key)
47 elif ev.type == pygame.locals.KEYUP:
48 self.key_up(ev.key)
49
50 def get_direction(self):
51 dx, dy = 0, 0
52 for (tx, ty), keys in self.direction_keys.iteritems():
53 if self.keys_down & keys:
54 dx += tx
55 dy += ty
56 return (dx, dy)
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._drawables = Drawables()
88 self.add_walls()
89 self._add_collision_handlers()
90 self.add_protagonist()
91 self.add_game_objects()
92 sound.play_music("POL-cyber-factory-short.ogg")
93
94 def teardown(self):
95 sound.stop()
96
97 @classmethod
98 def list_areas(self):
99 return Level.list_levels()
100
101 def _player_collision_pre_solve_handler(self, space, arbiter):
102 gobj = arbiter.shapes[1].physicser.game_object
103 result = gobj.collide_with_protagonist(self.protagonist)
104 # The collision handler must return `True` or `False`. We don't want to
105 # accidentally reject collisions from handlers that return `None`, so
106 # we explicitly check for `False` and treate everything else as `True`.
107 return result is not False
108
109 def _claw_attack_collision_pre_solve_handler(self, space, arbiter):
110 claw = arbiter.shapes[0].physicser.game_object
111 gobj = arbiter.shapes[1].physicser.game_object
112 result = gobj.collide_with_claw_attack(claw)
113 return result is not False
114
115 def _furniture_collision_pre_solve_handler(self, space, arbiter):
116 furniture = arbiter.shapes[0].physicser.game_object
117 gobj = arbiter.shapes[1].physicser.game_object
118 result = gobj.collide_with_furniture(furniture)
119 return result is not False
120
121 def _add_collision_handlers(self):
122 for collision_type in CALLBACK_COLLIDERS:
123 self.space.add_collision_handler(
124 COLLISION_TYPE_PLAYER, collision_type,
125 pre_solve=self._player_collision_pre_solve_handler)
126 self.space.add_collision_handler(
127 COLLISION_TYPE_FURNITURE, collision_type,
128 pre_solve=self._furniture_collision_pre_solve_handler)
129 self.space.add_collision_handler(
130 COLLISION_TYPE_WEREWOLF_ATTACK, collision_type,
131 pre_solve=self._claw_attack_collision_pre_solve_handler)
132
133 def add_walls(self):
134 self.walls = []
135 body = pymunk.Body()
136 body.position = (0, 0)
137 walls = self._level.get_walls()
138 for wall in walls:
139 if len(wall) < 2:
140 # Don't try to add a useless wall
141 continue
142 corners = wall
143 corner = corners[-1]
144 for next_corner in corners:
145 wall = pymunk.Segment(body, corner, next_corner, 5)
146 wall.collision_type = COLLISION_TYPE_WALL
147 wall.elasticity = 1.0
148 self.walls.append(wall)
149 corner = next_corner
150 self.space.add(*self.walls)
151
152 def add_game_objects(self):
153 for drawable in self._level.drawables:
154 self._drawables.add(drawable)
155
156 def add_protagonist(self):
157 self.protagonist = self.world.protagonist
158 self.protagonist.change_space(self.space)
159 self._drawables.add(self.protagonist)
160
161 def handle_event(self, ev):
162 if ev.type == pygame.locals.KEYDOWN:
163 if ev.key == pygame.locals.K_ESCAPE:
164 ScreenChange.post('menu')
165 cmd_key = self.keys.get_command_key(ev.key)
166 if cmd_key is not None:
167 self.protagonist.handle_keypress(cmd_key)
168 elif DoorEvent.matches(ev):
169 self.protagonist.set_position(ev.dest_pos)
170 if ev.destination != self.name:
171 # Go to anther screen
172 self._disable_render = True
173 self.world.rooms += 1
174 self.world.level = (ev.destination, ev.dest_pos)
175 ScreenChange.post(ev.destination)
176 return
177 # else we're teleporting within the screen, and just the
178 # position change is enough
179 elif FireEvent.matches(ev):
180 bullet = Bullet(self.space, ev.source, ev.impulse, ev.damage,
181 ev.source_collision_type)
182 self._drawables.add(bullet)
183 elif EnemyDeathEvent.matches(ev):
184 self.world.kills += 1
185 dead_enemy = DeadEnemy(self.space, self.world, ev.position,
186 ev.enemy_type)
187 self._drawables.add(dead_enemy)
188 elif ClawEvent.matches(ev):
189 claw_attack = ClawAttack(self.space, ev.source, ev.vector,
190 ev.damage)
191 self._drawables.add(claw_attack)
192 self.keys.handle_event(ev)
193
194 def _calc_viewport(self, level_surface, display_surface):
195 level_size = level_surface.get_size()
196 display_size = display_surface.get_size()
197 protagnist_pos = self.protagonist.physicser.get_render_position(
198 level_surface)
199 x_wide = display_size[0] // 2
200 y_wide = display_size[1] // 2
201 if display_size[0] > level_size[0]:
202 x = -(display_size[0] - level_size[0]) // 2
203 elif protagnist_pos[0] < x_wide:
204 x = 0
205 elif protagnist_pos[0] > level_size[0] - x_wide:
206 x = level_size[0] - display_size[0]
207 else:
208 x = protagnist_pos[0] - x_wide
209 if display_size[1] > level_size[1]:
210 y = -(display_size[1] - level_size[1]) // 2
211 elif protagnist_pos[1] < y_wide:
212 y = 0
213 elif protagnist_pos[1] > level_size[1] - y_wide:
214 y = level_size[1] - display_size[1]
215 else:
216 y = protagnist_pos[1] - y_wide
217 return pygame.rect.Rect(x, y, display_size[0], display_size[1])
218
219 def render(self, surface):
220 if self._disable_render:
221 return
222 background = self._level.get_background()
223 mysurface = background.copy()
224 for drawable in self._drawables:
225 drawable.render(mysurface)
226 render_rect = self._calc_viewport(mysurface, surface)
227 surface.blit(mysurface, (0, 0), render_rect)
228 for overlay in self._level.overlay_drawables:
229 if overlay.is_visible():
230 overlay.render(surface, render_rect.topleft)
231 self.render_health_bar(surface)
232
233 def tick_protagonist(self):
234 dx, dy = self.keys.get_direction()
235 self.protagonist.set_direction(dx, dy)
236
237 def tick(self, seconds):
238 super(AreaScreen, self).tick(seconds)
239 self.tick_protagonist()
240 for drawable in self._drawables:
241 drawable.update(seconds)
242 if drawable.remove:
243 self._drawables.remove(drawable)
244
245 def render_health_bar(self, surface, damage_experienced=None):
246 bar_surface = pygame.Surface((110, 50)).convert(surface)
247 if damage_experienced:
248 health_box_colour = pygame.color.THECOLORS['red']
249 else:
250 health_box_colour = pygame.color.THECOLORS['white']
251 bar_surface.fill(health_box_colour)
252 if self.protagonist.in_human_form():
253 health_colour = pygame.color.THECOLORS['red']
254 else:
255 health_colour = pygame.color.THECOLORS['violetred3']
256 rect = pygame.Rect(5, 5, self.protagonist.get_health_level(), 40)
257 pygame.draw.rect(bar_surface, health_colour, rect, 0)
258 bar_surface.set_alpha(192)
259 surface.blit(bar_surface, (50, 500))
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