Mercurial > mamba
annotate mamba/snake.py @ 212:e768056b0588
Refactor tile image loading stuff. More magic is good, right?
author | Jeremy Thurgood <firxen@gmail.com> |
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date | Wed, 14 Sep 2011 21:12:20 +0200 |
parents | bf661acd34ee |
children | 7a9be9add4c7 |
rev | line source |
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78 | 1 """The player snake object.""" |
2 | |
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3 from pygame.sprite import Group, spritecollide |
110 | 4 |
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5 from mamba.constants import TILE_SIZE, UP, DOWN, LEFT, RIGHT |
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6 from mamba.sprites import BaseSprite |
186 | 7 from mamba.engine import SnakeDiedEvent |
98 | 8 from mamba import mutators |
78 | 9 |
10 | |
110 | 11 class Snake(object): |
78 | 12 |
13 def __init__(self, tile_pos, orientation): | |
110 | 14 self.segments = self.create_segments(tile_pos, orientation) |
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15 self.pending_segments = [] # segments waiting to be added |
110 | 16 self.segment_group = Group() |
178 | 17 self.segment_group.add(*reversed(self.segments)) |
78 | 18 self.set_orientation(orientation) |
178 | 19 self.speed = 120.0 # pixel / s |
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20 self.frac_ds = 0.0 |
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21 self.mutation = None |
78 | 22 |
110 | 23 head = property(fget=lambda self: self.segments[0]) |
24 tail = property(fget=lambda self: self.segments[-1]) | |
25 | |
26 def create_segments(self, tile_pos, orientation): | |
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27 tx, ty = tile_pos |
110 | 28 dx, dy = orientation |
178 | 29 segments = [] |
30 for cls in [Head] + [Body] * 10 + [Tail]: | |
31 segments.append(cls((tx, ty))) | |
32 return segments | |
110 | 33 |
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34 def add_segment(self, segment=None): |
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35 if segment is None: |
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36 segment = Body((0, 0)) |
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37 segment.set_colour(self.head.colour) |
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38 self.pending_segments.append(segment) |
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39 |
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40 def remove_segment(self, segment=None): |
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41 if segment is None: |
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42 if len(self.segments) < 3: |
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43 return |
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44 segment = self.segments[-2] |
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45 try: |
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46 idx = self.segments.index(segment) |
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47 except IndexError: |
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48 return |
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49 self.shiftup_segments(idx, segment.get_tile_state()) |
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50 del self.segments[idx] |
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51 segment.kill() |
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52 |
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53 def shiftup_segments(self, idx, state): |
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54 for segment in self.segments[idx:]: |
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55 next_state = segment.get_tile_state() |
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56 segment.shift_tile(state) |
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57 state = next_state |
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58 |
110 | 59 def draw(self, surface): |
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60 self.segment_group.draw(surface) |
98 | 61 |
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62 def update(self, dt, world): |
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63 ds = dt * self.speed + self.frac_ds |
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64 ds, self.frac_ds = divmod(ds, 1) |
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65 ds = int(ds) |
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66 while True: |
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67 tile_state = self.head.get_tile_state() |
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68 shifted, ds = self.head.shift_head(ds) |
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69 if not shifted: |
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70 break |
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71 if self.pending_segments: |
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72 new_segment = self.pending_segments.pop(0) |
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73 self.segments.insert(1, new_segment) |
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74 self.segment_group.add(new_segment) |
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75 new_segment.shift_tile(tile_state) |
206 | 76 for segment in self.segments[2:]: |
77 segment.shift_tile(segment.get_tile_state()) | |
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78 else: |
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79 self.shiftup_segments(1, tile_state) |
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80 if not self.check_uturn(): |
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81 self.head.set_orientation(self.orientation) |
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82 |
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83 for segment in self.segments: |
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84 segment.shift_pixels(ds) |
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85 world.interact(segment) |
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86 |
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87 def check_uturn(self): |
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88 if len(self.segments) > 1: |
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89 neck_x, neck_y = self.segments[1].tile_pos |
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90 head_x, head_y = self.head.tile_pos |
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91 if (head_x + self.orientation[0] == neck_x and |
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92 head_y + self.orientation[1] == neck_y): |
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93 # Don't allow the snake to go back on itself |
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94 # immediately. More creative self-inflicted |
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95 # deaths are allowed though. |
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96 return True |
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97 return False |
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98 |
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99 def set_orientation(self, orientation): |
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100 self.orientation = orientation |
98 | 101 |
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102 def crash(self): |
186 | 103 SnakeDiedEvent.post() |
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104 |
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105 def mutate(self, mutation): |
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106 self.mutation = mutation |
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107 |
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108 def can_swim(self): |
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109 return self.mutation == 'amphibious' |
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110 |
98 | 111 |
110 | 112 class Segment(BaseSprite): |
113 | |
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114 GREEN = mutators.SNAKE_GREEN |
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115 BLUE = mutators.BLUE |
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116 RED = mutators.RED |
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117 YELLOW = mutators.YELLOW |
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118 |
131 | 119 _detail_mutators = () |
120 | |
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121 is_head = False |
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122 |
110 | 123 def __init__(self, image_name, tile_pos): |
124 super(Segment, self).__init__() | |
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125 self.set_base_image(image_name) |
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126 self.colour = self.GREEN |
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127 self.orientation = UP |
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128 |
131 | 129 self.make_images() |
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130 self.update_image() |
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131 self.set_tile_pos(tile_pos) |
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132 self.on_tiles = [] |
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133 |
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134 def filter_collisions(self, group): |
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135 collide = [] |
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136 tiles = spritecollide(self, group, False) |
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137 for tile in tiles: |
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138 if tile not in self.on_tiles: |
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139 collide.append(tile) |
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140 self.on_tiles = tiles |
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141 return collide |
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142 |
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143 def set_base_image(self, image_name): |
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144 self._base_image = "/".join(["snake", image_name]) |
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145 |
131 | 146 def make_images(self): |
110 | 147 self._images = {} |
148 for orientation, muts in [ | |
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149 (RIGHT, (mutators.RIGHT,)), |
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150 (LEFT, (mutators.LEFT,)), |
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151 (UP, (mutators.UP,)), |
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152 (DOWN, (mutators.DOWN,)), |
110 | 153 ]: |
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154 all_muts = (self.colour,) + self._detail_mutators + muts |
141 | 155 self._images[orientation] = self.load_image(self._base_image, |
156 all_muts) | |
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157 |
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158 def update_image(self): |
177
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159 self.image = self._images[self.orientation] |
110 | 160 |
161 def set_orientation(self, orientation): | |
177
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162 self.orientation = orientation |
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163 self.update_image() |
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164 |
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165 def set_colour(self, colour_overlay): |
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166 self.colour = colour_overlay |
131 | 167 self.make_images() |
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168 self.update_image() |
110 | 169 |
177
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170 def get_tile_state(self): |
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171 return self.tile_pos, self.orientation |
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172 |
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173 def shift_tile(self, tile_state): |
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174 """Shift this segment to the tile the other one was on. |
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175 |
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176 Also reset the position to be the center of the tile. |
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177 """ |
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178 tile_pos, orientation = tile_state |
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179 self.set_tile_pos(tile_pos) |
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180 self.orientation = orientation |
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181 |
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182 def shift_pixels(self, distance): |
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183 """Shift this segment a number of pixels.""" |
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184 dx, dy = self.orientation |
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185 dx, dy = distance * dx, distance * dy |
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186 self.rect = self.rect.move(dx, dy) |
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187 |
110 | 188 |
189 class Head(Segment): | |
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190 CLOSED = "snake-head" |
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191 OPEN = "snake-head-mouth-open-r" |
212
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192 EYE = mutators.Overlay("snake/snake-head-eye-r") |
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193 TONGUE = mutators.Overlay("snake/snake-head-tongue-r") |
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194 |
182
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195 is_head = True |
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196 |
110 | 197 def __init__(self, tile_pos): |
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198 self._detail_mutators = (self.EYE,) |
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199 super(Head, self).__init__(self.CLOSED, tile_pos) |
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200 |
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201 def mouth_open(self): |
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202 self.set_base_image(self.OPEN) |
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203 self.make_images() |
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204 self.update_image() |
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205 |
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206 def mouth_closed(self): |
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207 self.set_base_image(self.CLOSED) |
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208 self.make_images() |
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209 self.update_image() |
110 | 210 |
131 | 211 def tongue_out(self): |
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212 self._detail_mutators = (self.EYE, self.TONGUE) |
131 | 213 self.make_images() |
214 self.update_image() | |
215 | |
216 def tongue_in(self): | |
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217 self._detail_mutators = (self.EYE,) |
131 | 218 self.make_images() |
219 self.update_image() | |
220 | |
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221 def shift_head(self, ds): |
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222 """Shift the head a number of pixels in the direction of it |
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223 orientation. |
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224 """ |
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225 dx, dy = self.orientation |
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226 TX, TY = TILE_SIZE |
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227 rx, ry = self.rect.left, self.rect.top |
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228 tx, ty = self.tile_pos |
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229 # WARNING: Tri-state logic ahead |
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230 # (Tri-state logic is the mamba's natural habitat) |
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231 if dx != 0: |
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232 newdx = rx + ds * dx |
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233 newtx = newdx / TX |
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234 if newtx > tx: |
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235 self.set_tile_pos((tx + 1, ty)) |
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236 ds = newdx - self.rect.left |
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237 return True, ds |
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238 elif newtx < tx - 1: |
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239 self.set_tile_pos((tx - 1, ty)) |
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240 ds = self.rect.left - newdx |
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241 return True, ds |
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242 else: |
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243 newdy = ry + ds * dy |
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244 newty = newdy / TY |
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245 if newty > ty: |
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246 self.set_tile_pos((tx, ty + 1)) |
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247 ds = newdy - self.rect.top |
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248 return True, ds |
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249 elif newty < ty - 1: |
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250 self.set_tile_pos((tx, ty - 1)) |
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251 ds = self.rect.top - newdy |
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252 return True, ds |
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253 return False, ds |
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254 |
110 | 255 |
256 class Body(Segment): | |
257 def __init__(self, tile_pos): | |
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258 super(Body, self).__init__("snake-body", tile_pos) |
110 | 259 |
260 | |
261 class Tail(Segment): | |
262 def __init__(self, tile_pos): | |
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263 super(Tail, self).__init__("snake-tail", tile_pos) |