Mercurial > mamba
annotate mamba/snake.py @ 262:9f3b4e16372e
renamed tail images for consistency
author | Adrianna Pińska <adrianna.pinska@gmail.com> |
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date | Thu, 15 Sep 2011 02:26:35 +0200 |
parents | d0ed88799c44 |
children | c7c9d71ac6ea |
rev | line source |
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78 | 1 """The player snake object.""" |
2 | |
221 | 3 import random |
4 | |
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5 from pygame.sprite import Group, spritecollide |
110 | 6 |
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7 from mamba.constants import TILE_SIZE, UP, DOWN, LEFT, RIGHT |
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8 from mamba.sprites import BaseSprite, tile_sizify |
213 | 9 from mamba.engine import SnakeDiedEvent, LevelCompletedEvent |
98 | 10 from mamba import mutators |
78 | 11 |
12 | |
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13 INITIAL_SEGMENT_COUNT = 4 |
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14 |
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15 |
110 | 16 class Snake(object): |
78 | 17 |
18 def __init__(self, tile_pos, orientation): | |
110 | 19 self.segments = self.create_segments(tile_pos, orientation) |
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20 self.pending_segments = [] # segments waiting to be added |
110 | 21 self.segment_group = Group() |
178 | 22 self.segment_group.add(*reversed(self.segments)) |
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23 self.orientation = orientation |
178 | 24 self.speed = 120.0 # pixel / s |
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25 self.frac_ds = 0.0 |
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26 self.mutation = None |
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27 self.coiled = True |
78 | 28 |
110 | 29 head = property(fget=lambda self: self.segments[0]) |
30 tail = property(fget=lambda self: self.segments[-1]) | |
31 | |
32 def create_segments(self, tile_pos, orientation): | |
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33 tx, ty = tile_pos |
110 | 34 dx, dy = orientation |
178 | 35 segments = [] |
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36 for cls in [Head] + [Body] * INITIAL_SEGMENT_COUNT + [Tail]: |
178 | 37 segments.append(cls((tx, ty))) |
38 return segments | |
110 | 39 |
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40 def add_segment(self, segment=None): |
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41 if segment is None: |
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42 segment = Body((0, 0)) |
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43 segment.set_colour(self.head.colour) |
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44 self.pending_segments.append(segment) |
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45 |
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46 def remove_segment(self, segment=None): |
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47 if segment is None: |
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48 if len(self.segments) < 3: |
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49 return |
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50 segment = self.segments[-2] |
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51 try: |
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52 idx = self.segments.index(segment) |
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53 except IndexError: |
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54 return |
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55 self.shiftup_segments(idx, segment.get_tile_state()) |
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56 del self.segments[idx] |
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57 segment.kill() |
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58 |
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59 def shiftup_segments(self, idx, state): |
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60 for segment in self.segments[idx:]: |
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61 next_state = segment.get_tile_state() |
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62 segment.shift_tile(state) |
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63 state = next_state |
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64 |
110 | 65 def draw(self, surface): |
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66 self.segment_group.draw(surface) |
98 | 67 |
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68 def update(self, dt, world): |
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69 ds = dt * self.speed + self.frac_ds |
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70 ds, self.frac_ds = divmod(ds, 1) |
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71 ds = int(ds) |
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72 while True: |
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73 tile_state = self.head.get_tile_state() |
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74 shifted, ds = self.head.shift_head(ds) |
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75 if shifted: |
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76 self.coiled = False |
221 | 77 self.head.shifted_tile() |
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78 self.head.set_orientation(self.orientation) |
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79 else: |
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80 break |
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81 if self.pending_segments: |
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82 new_segment = self.pending_segments.pop(0) |
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83 self.segments.insert(1, new_segment) |
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84 self.segment_group.add(new_segment) |
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85 new_segment.shift_tile(tile_state) |
206 | 86 for segment in self.segments[2:]: |
87 segment.shift_tile(segment.get_tile_state()) | |
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88 else: |
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89 self.shiftup_segments(1, tile_state) |
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90 |
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91 self.check_self_crash() |
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92 for segment in self.segments: |
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93 segment.shift_pixels(ds) |
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94 world.interact(segment) |
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95 |
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96 def set_orientation(self, orientation): |
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97 # Don't allow the snake to go back on itself |
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98 # immediately. More creative self-inflicted |
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99 # deaths are allowed though. |
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100 if (abs(self.head.orientation[0] - orientation[0]) < 2 |
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101 and abs(self.head.orientation[1] - orientation[1]) < 2): |
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102 self.orientation = orientation |
98 | 103 |
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104 def check_self_crash(self): |
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105 if self.coiled: |
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106 return |
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107 collides = spritecollide(self.head, self.segment_group, False) |
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108 if [s for s in collides if s not in self.segments[:2]]: |
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109 self.crash() |
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110 |
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111 def crash(self): |
186 | 112 SnakeDiedEvent.post() |
181
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113 |
213 | 114 def exit_level(self): |
115 LevelCompletedEvent.post() | |
116 | |
181
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117 def mutate(self, mutation): |
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118 self.mutation = mutation |
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119 self.tail.show_mutation(mutation) |
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120 |
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121 def can_swim(self): |
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122 return self.mutation == 'amphibious' |
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123 |
255 | 124 def flame_retardant(self): |
125 return self.mutation == 'flame-retardant' | |
126 | |
98 | 127 |
110 | 128 class Segment(BaseSprite): |
129 | |
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130 GREEN = mutators.SNAKE_GREEN |
125
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131 BLUE = mutators.BLUE |
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132 RED = mutators.RED |
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133 YELLOW = mutators.YELLOW |
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134 |
131 | 135 _detail_mutators = () |
136 | |
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137 is_head = False |
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138 |
110 | 139 def __init__(self, image_name, tile_pos): |
140 super(Segment, self).__init__() | |
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141 self.set_base_image(image_name) |
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142 self.colour = self.GREEN |
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143 self.orientation = UP |
125
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144 |
131 | 145 self.make_images() |
125
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146 self.update_image() |
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147 self.set_tile_pos(tile_pos) |
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148 self.on_tiles = [] |
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149 |
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150 def filter_collisions(self, group): |
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151 collide = [] |
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152 tiles = spritecollide(self, group, False) |
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153 for tile in tiles: |
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154 if tile not in self.on_tiles: |
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155 collide.append(tile) |
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156 self.on_tiles = tiles |
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157 return collide |
125
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158 |
153
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159 def set_base_image(self, image_name): |
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160 self._base_image = "/".join(["snake", image_name]) |
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161 |
131 | 162 def make_images(self): |
110 | 163 self._images = {} |
164 for orientation, muts in [ | |
199
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165 (RIGHT, (mutators.RIGHT,)), |
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166 (LEFT, (mutators.LEFT,)), |
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167 (UP, (mutators.UP,)), |
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168 (DOWN, (mutators.DOWN,)), |
110 | 169 ]: |
205
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170 all_muts = (self.colour,) + self._detail_mutators + muts |
141 | 171 self._images[orientation] = self.load_image(self._base_image, |
172 all_muts) | |
125
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173 |
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174 def update_image(self): |
177
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175 self.image = self._images[self.orientation] |
110 | 176 |
177 def set_orientation(self, orientation): | |
177
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178 self.orientation = orientation |
125
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179 self.update_image() |
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180 |
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181 def set_colour(self, colour_overlay): |
205
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182 self.colour = colour_overlay |
131 | 183 self.make_images() |
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184 self.update_image() |
110 | 185 |
177
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186 def get_tile_state(self): |
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187 return self.tile_pos, self.orientation |
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188 |
252
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189 def get_distance(self): |
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190 rx, ry = self.rect.topleft |
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191 x, y = tile_sizify(self.tile_pos) |
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192 return max(abs(rx - x), abs(ry - y)) |
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193 |
177
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194 def shift_tile(self, tile_state): |
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195 """Shift this segment to the tile the other one was on. |
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196 |
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197 Also reset the position to be the center of the tile. |
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198 """ |
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199 tile_pos, orientation = tile_state |
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200 self.set_tile_pos(tile_pos) |
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201 self.orientation = orientation |
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202 |
252
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203 def shift_tile_and_pixels(self, tile_state): |
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204 ds = self.get_distance() |
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205 self.shift_tile(tile_state) |
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206 self.shift_pixels(ds) |
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207 |
221 | 208 def shifted_tile(self): |
209 pass | |
210 | |
177
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211 def shift_pixels(self, distance): |
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212 """Shift this segment a number of pixels.""" |
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213 dx, dy = self.orientation |
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214 dx, dy = distance * dx, distance * dy |
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215 self.rect = self.rect.move(dx, dy) |
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216 |
223
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217 def shift_head(self, ds): |
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218 """Shift the head a number of pixels in the direction of it |
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219 orientation. |
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220 """ |
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221 dx, dy = self.orientation |
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222 TX, TY = TILE_SIZE |
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223 rx, ry = self.rect.left, self.rect.top |
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224 tx, ty = self.tile_pos |
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225 # WARNING: Tri-state logic ahead |
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226 # (Tri-state logic is the mamba's natural habitat) |
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227 if dx != 0: |
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228 newdx = rx + ds * dx |
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229 newtx = newdx / TX |
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230 if newtx > tx: |
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231 self.set_tile_pos((tx + 1, ty)) |
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232 ds = newdx - self.rect.left |
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233 return True, ds |
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234 elif newtx < tx - 1: |
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235 self.set_tile_pos((tx - 1, ty)) |
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236 ds = self.rect.left - newdx |
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237 return True, ds |
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238 else: |
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239 newdy = ry + ds * dy |
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240 newty = newdy / TY |
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241 if newty > ty: |
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242 self.set_tile_pos((tx, ty + 1)) |
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243 ds = newdy - self.rect.top |
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244 return True, ds |
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245 elif newty < ty - 1: |
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246 self.set_tile_pos((tx, ty - 1)) |
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247 ds = self.rect.top - newdy |
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248 return True, ds |
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249 return False, ds |
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250 |
110 | 251 |
252 class Head(Segment): | |
153
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253 CLOSED = "snake-head" |
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254 OPEN = "snake-head-mouth-open-r" |
212
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255 EYE = mutators.Overlay("snake/snake-head-eye-r") |
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256 TONGUE = mutators.Overlay("snake/snake-head-tongue-r") |
153
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257 |
182
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258 is_head = True |
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259 |
110 | 260 def __init__(self, tile_pos): |
153
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261 self._detail_mutators = (self.EYE,) |
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262 super(Head, self).__init__(self.CLOSED, tile_pos) |
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263 |
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264 def mouth_open(self): |
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265 self.set_base_image(self.OPEN) |
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266 self.make_images() |
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267 self.update_image() |
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268 |
218
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Open mouth when eating things
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269 def mouth_close(self): |
153
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270 self.set_base_image(self.CLOSED) |
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271 self.make_images() |
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272 self.update_image() |
110 | 273 |
131 | 274 def tongue_out(self): |
153
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275 self._detail_mutators = (self.EYE, self.TONGUE) |
131 | 276 self.make_images() |
277 self.update_image() | |
278 | |
279 def tongue_in(self): | |
153
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280 self._detail_mutators = (self.EYE,) |
131 | 281 self.make_images() |
282 self.update_image() | |
283 | |
221 | 284 def shifted_tile(self): |
285 if random.random() < 0.02: | |
286 self.mouth_open() | |
287 self.tongue_out() | |
288 else: | |
289 self.mouth_close() | |
290 self.tongue_in() | |
291 | |
110 | 292 |
293 class Body(Segment): | |
294 def __init__(self, tile_pos): | |
153
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295 super(Body, self).__init__("snake-body", tile_pos) |
110 | 296 |
297 | |
298 class Tail(Segment): | |
261
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299 INDICATORS = { |
262
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300 "flame-retardant": mutators.Overlay("snake/snake-tail-fire-r"), |
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301 "amphibious": mutators.Overlay("snake/snake-tail-puddle-r"), |
261
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302 } |
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303 |
110 | 304 def __init__(self, tile_pos): |
262
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305 super(Tail, self).__init__("snake-tail-r", tile_pos) |
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306 |
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307 def show_mutation(self, mutation): |
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308 self._detail_mutators = (self.INDICATORS[mutation],) |
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309 self.make_images() |
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310 self.update_image() |