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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6 | |
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7 | from nagslang.screens.base import Screen |
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8 | from nagslang.level import Level |
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9 | from nagslang.events import ScreenChange |
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10 | |
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11 | |
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12 | class ControlKeys(object): |
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13 | def __init__(self): |
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14 | self.keys_down = set() |
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15 | |
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16 | def key_down(self, key): |
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17 | self.keys_down.add(key) |
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18 | |
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19 | def key_up(self, key): |
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20 | self.keys_down.discard(key) |
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21 | |
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22 | def handle_event(self, ev): |
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23 | if ev.type == pygame.locals.KEYDOWN: |
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24 | self.key_down(ev.key) |
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25 | elif ev.type == pygame.locals.KEYUP: |
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26 | self.key_up(ev.key) |
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27 | |
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28 | |
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29 | class Protagonist(object): |
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30 | def __init__(self, position): |
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31 | self.body = pymunk.Body(10, 10000) |
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32 | self.body.position = position |
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33 | self.body.velocity_func = self.velocity_func |
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34 | |
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35 | self.shape = pymunk.Circle(self.body, 30) |
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36 | self.shape.elasticity = 1.0 |
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37 | self.shape.friction = 10.0 |
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38 | |
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39 | self.go_human() |
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40 | |
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41 | def add_space(self, space): |
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42 | space.add(self.body, self.shape) |
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43 | |
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44 | def velocity_func(self, body, gravity, damping, dt): |
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45 | return pymunk.Body.update_velocity(body, gravity, self.damping, dt) |
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46 | |
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47 | def render(self, surface): |
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48 | pymunk.pygame_util.draw(surface, self.shape) |
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49 | |
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50 | def go_werewolf(self): |
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51 | self.werewolf = True |
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52 | self.body.mass = 100 |
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53 | self.body.moment = 10000 |
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54 | self.body.velocity_limit = 1000 |
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55 | self.shape.color = pygame.color.THECOLORS['red'] |
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56 | self.impulse_factor = 4000 |
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57 | self.damping = 0.9 |
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58 | |
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59 | def go_human(self): |
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60 | self.werewolf = False |
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61 | self.body.mass = 10 |
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62 | self.body.moment = 1000 |
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63 | self.body.velocity_limit = 1000 |
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64 | self.shape.color = pygame.color.THECOLORS['blue'] |
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65 | self.impulse_factor = 500 |
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66 | self.damping = 0.8 |
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67 | |
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68 | def set_direction(self, dx, dy): |
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69 | if (dx, dy) == (0, 0): |
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70 | return |
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71 | vec = pymunk.Vec2d((dx, dy)) |
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72 | self.body.angle = vec.angle |
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73 | self.body.apply_impulse( |
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74 | (dx * self.impulse_factor, dy * self.impulse_factor)) |
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75 | |
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76 | def toggle_form(self): |
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77 | if self.werewolf: |
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78 | self.go_human() |
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79 | else: |
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80 | self.go_werewolf() |
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81 | |
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82 | |
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83 | class AreaScreen(Screen): |
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84 | |
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85 | def setup(self): |
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86 | self.keys = ControlKeys() |
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87 | self._level = Level(self.name) |
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88 | self._level.load() |
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89 | self.add_walls() |
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90 | self.add_protagonist() |
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91 | |
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92 | def add_walls(self): |
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93 | self.walls = [] |
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94 | body = pymunk.Body() |
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95 | body.position = (0, -300) |
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96 | walls = self._level.get_walls() |
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97 | for wall in walls: |
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98 | corners = wall |
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99 | corner = corners[-1] |
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100 | for next_corner in corners: |
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101 | wall = pymunk.Segment(body, corner, next_corner, 5) |
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102 | wall.elasticity = 1.0 |
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103 | self.walls.append(wall) |
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104 | corner = next_corner |
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105 | self.space.add(*self.walls) |
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106 | |
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107 | def add_protagonist(self): |
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108 | self.protagonist = Protagonist((400, 300)) |
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109 | self.protagonist.add_space(self.space) |
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110 | |
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111 | def handle_event(self, ev): |
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112 | if ev.type == pygame.locals.KEYDOWN: |
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113 | if ev.key == pygame.locals.K_ESCAPE: |
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114 | ScreenChange.post('menu') |
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115 | if ev.key == pygame.locals.K_w: |
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116 | self.protagonist.toggle_form() |
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117 | self.keys.handle_event(ev) |
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118 | |
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119 | def render(self, surface): |
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120 | #surface.fill(pygame.color.Color(0, 0, 0)) |
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121 | background = self._level.get_background() |
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122 | surface.blit(background, (0, 0)) |
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123 | #pymunk.pygame_util.draw(surface, *self.walls) |
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124 | self.protagonist.render(surface) |
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125 | |
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126 | def tick_protagonist(self): |
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127 | dx, dy = 0, 0 |
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128 | for key, tx, ty in [ |
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129 | (pygame.locals.K_UP, 0, 1), (pygame.locals.K_DOWN, 0, -1), |
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130 | (pygame.locals.K_LEFT, -1, 0), (pygame.locals.K_RIGHT, 1, 0) |
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131 | ]: |
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132 | if key in self.keys.keys_down: |
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133 | dx += tx |
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134 | dy += ty |
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135 | self.protagonist.set_direction(dx, dy) |
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136 | |
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137 | def tick(self, seconds): |
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138 | self.tick_protagonist() |
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139 | super(AreaScreen, self).tick(seconds) |
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