annotate nagslang/game_object.py @ 133:79e1888573d3

A box.
author Jeremy Thurgood <firxen@gmail.com>
date Mon, 02 Sep 2013 18:05:03 +0200
parents c3af35561494
children f36a7075d9a0
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1 import math
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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.constants import (
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8 SWITCH_PUSHERS, COLLISION_TYPE_SWITCH, COLLISION_TYPE_BOX, ZORDER_LOW)
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9 from nagslang.options import options
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12 class PuzzleGlue(object):
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13 """Glue that holds bits of a puzzle together.
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14 """
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15 def __init__(self):
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16 self._components = {}
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17
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18 def add_component(self, name, puzzler):
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19 self._components[name] = puzzler
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20 puzzler.set_glue(self)
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21
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22 def get_state_of(self, name):
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23 return self._components[name].get_state()
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24
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25
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26 class Puzzler(object):
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27 """Behaviour specific to a puzzle component.
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28 """
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29 def set_glue(self, glue):
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30 self.glue = glue
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31
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32 def set_game_object(self, game_object):
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33 self.game_object = game_object
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34
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35 def get_state(self):
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36 raise NotImplementedError()
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39 class FloorSwitchPuzzler(Puzzler):
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40 def get_state(self):
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41 space = self.game_object.get_space()
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42 for shape in space.shape_query(self.game_object.get_shape()):
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43 if shape.collision_type in SWITCH_PUSHERS:
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44 return True
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45 return False
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48 class StateProxyPuzzler(Puzzler):
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49 def __init__(self, state_source):
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50 self._state_source = state_source
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51
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52 def get_state(self):
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53 return self.glue.get_state_of(self._state_source)
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55
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56 class Physicser(object):
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57 def __init__(self, space):
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58 self._space = space
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59
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60 def get_space(self):
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61 return self._space
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62
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63 def set_game_object(self, game_object):
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64 self.game_object = game_object
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65
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66 def get_shape(self):
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67 raise NotImplementedError()
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69 def add_to_space(self):
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70 raise NotImplementedError()
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72 def remove_from_space(self):
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73 raise NotImplementedError()
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75 def get_render_position(self, surface):
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76 raise NotImplementedError()
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78 def get_angle(self):
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79 raise NotImplementedError()
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80
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81 def apply_impulse(self, j, r=(0, 0)):
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82 raise NotImplementedError()
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84
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85 class SingleShapePhysicser(Physicser):
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86 def __init__(self, space, shape):
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87 super(SingleShapePhysicser, self).__init__(space)
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88 self._shape = shape
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89
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90 def get_shape(self):
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91 return self._shape
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92
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93 def add_to_space(self):
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94 self.get_space().add(self._shape)
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95 if not self._shape.body.is_static:
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96 self.get_space().add(self._shape.body)
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97
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98 def remove_from_space(self):
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99 self.get_space().remove(self._shape)
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100 if not self._shape.body.is_static:
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101 self.get_space().remove(self._shape.body)
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102
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103 def get_render_position(self, surface):
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104 pos = self._shape.body.position
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105 return pymunk.pygame_util.to_pygame(pos, surface)
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106
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107 def get_angle(self):
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108 return self._shape.body.angle
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109
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110 def apply_impulse(self, j, r=(0, 0)):
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111 return self._shape.body.apply_impulse(j, r)
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112
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113
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114 class Renderer(object):
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115 def set_game_object(self, game_object):
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116 self.game_object = game_object
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117
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118 def _render_shape(self, surface):
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119 shape = self.game_object.get_shape()
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120 # Less general that pymunk.pygame_util.draw, but also a lot less noisy.
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121 color = getattr(shape, 'color', pygame.color.THECOLORS['lightblue'])
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122 # We only explicitly draw Circle and Poly shapes. Everything else we
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123 # forward to pymunk.
123
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124 if isinstance(shape, pymunk.Circle):
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125 centre = pymunk.pygame_util.to_pygame(shape.body.position, surface)
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126 radius = int(shape.radius)
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127 pygame.draw.circle(surface, color, centre, radius, 2)
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128 elif isinstance(shape, pymunk.Poly):
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129 # polygon bounding box
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130 points = [pymunk.pygame_util.to_pygame(p, surface)
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131 for p in shape.get_vertices()]
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132 pygame.draw.lines(surface, color, True, points, 2)
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133 else:
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134 pymunk.pygame_util.draw(surface, shape)
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135
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136 def render(self, surface):
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137 pos = self.game_object.get_render_position(surface)
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138 angle = self.game_object.get_render_angle()
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139 if options.debug:
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140 self._render_shape(surface, pos, angle)
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141
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142
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143 def image_pos(image, pos):
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144 return (pos[0] - image.get_width() / 2,
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145 pos[1] - image.get_height() / 2)
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146
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147
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148 class ImageRenderer(Renderer):
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149 def __init__(self, image):
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150 self._image = image
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151
123
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152 def render(self, surface):
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153 pos = self.game_object.get_render_position(surface)
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154 surface.blit(self._image, image_pos(self._image, pos))
123
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155 super(ImageRenderer, self).render(surface)
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156
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157
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158 class FacingImageRenderer(Renderer):
123
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159 def __init__(self, left_image, right_image):
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160 self._images = {
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161 'left': left_image,
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162 'right': right_image,
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163 }
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164
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165 def get_image(self, angle):
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166 if abs(angle) < math.pi / 2:
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167 return self._images['right']
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168 return self._images['left']
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169
123
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170 def render(self, surface):
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171 pos = self.game_object.get_render_position(surface)
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172 image = self.get_image(self.game_object.get_render_angle())
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173 surface.blit(image, image_pos(image, pos))
123
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174 super(FacingImageRenderer, self).render(surface)
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175
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176
133
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177 class ShapeRenderer(Renderer):
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178 def render(self, surface):
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179 self._render_shape(surface)
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180 super(ShapeRenderer, self).render(surface)
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181
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182
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183 class ShapeStateRenderer(ShapeRenderer):
126
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184 """Renders the shape in a different colour depending on the state.
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185
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186 Requires the game object it's attached to to have a puzzler.
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187 """
123
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188 def render(self, surface):
126
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189 if self.game_object.puzzler.get_state():
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190 color = pygame.color.THECOLORS['green']
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191 else:
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192 color = pygame.color.THECOLORS['red']
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193
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194 self.game_object.get_shape().color = color
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195 super(ShapeStateRenderer, self).render(surface)
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196
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197
133
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198 def damping_velocity_func(body, gravity, damping, dt):
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199 """Apply custom damping to this body's velocity.
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200 """
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201 damping = getattr(body, 'damping', damping)
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202 return pymunk.Body.update_velocity(body, gravity, damping, dt)
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203
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204
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205 def make_body(mass, moment, position, damping=None):
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206 body = pymunk.Body(mass, moment)
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207 body.position = position
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208 if damping is not None:
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209 body.damping = damping
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210 body.velocity_func = damping_velocity_func
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211 return body
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212
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213
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214 class GameObject(object):
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215 """A representation of a thing in the game world.
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216
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217 This has a rendery thing, physicsy things and maybe some other things.
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218 """
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219
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220 def __init__(self, physicser, renderer, puzzler=None):
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221 self.physicser = physicser
123
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222 physicser.set_game_object(self)
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223 self.physicser.add_to_space()
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224 self.renderer = renderer
123
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225 renderer.set_game_object(self)
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226 self.puzzler = puzzler
123
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227 if puzzler is not None:
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228 puzzler.set_game_object(self)
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229 self.zorder = ZORDER_LOW
59
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230
123
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231 def get_space(self):
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232 return self.physicser.get_space()
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233
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234 def get_shape(self):
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235 return self.physicser.get_shape()
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236
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237 def get_render_position(self, surface):
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238 return self.physicser.get_render_position(surface)
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239
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240 def get_render_angle(self):
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241 return self.physicser.get_angle()
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242
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243 def render(self, surface):
123
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244 return self.renderer.render(surface)
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245
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246
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247 class FloorSwitch(GameObject):
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248 def __init__(self, space, position):
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249 body = pymunk.Body()
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250 body.position = position
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251 self.shape = pymunk.Circle(body, 30)
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252 self.shape.collision_type = COLLISION_TYPE_SWITCH
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253 self.shape.sensor = True
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254 super(FloorSwitch, self).__init__(
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255 SingleShapePhysicser(space, self.shape),
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256 ShapeStateRenderer(),
123
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257 FloorSwitchPuzzler(),
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258 )
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259
106
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260
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261 class FloorLight(GameObject):
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262 def __init__(self, space, position, state_source):
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263 body = pymunk.Body()
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264 body.position = position
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265 self.shape = pymunk.Circle(body, 10)
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266 self.shape.collision_type = COLLISION_TYPE_SWITCH
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267 self.shape.sensor = True
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268 super(FloorLight, self).__init__(
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269 SingleShapePhysicser(space, self.shape),
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270 ShapeStateRenderer(),
106
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271 StateProxyPuzzler(state_source),
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272 )
133
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273
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274
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275 class Box(GameObject):
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276 def __init__(self, space, position):
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277 body = make_body(10, 10000, position, damping=0.5)
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278 self.shape = pymunk.Poly(
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diff changeset
279 body, [(-20, -20), (20, -20), (20, 20), (-20, 20)])
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280 self.shape.collision_type = COLLISION_TYPE_BOX
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281 super(Box, self).__init__(
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282 SingleShapePhysicser(space, self.shape),
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283 ShapeRenderer(),
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284 )