Mercurial > rinkhals
annotate gamelib/animal.py @ 70:d92a2f973cc4
Make foxes move 'better' and break fences
author | Neil Muller <drnlmuller@gmail.com> |
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date | Mon, 31 Aug 2009 22:14:41 +0000 |
parents | f20dd3dcb118 |
children | 00cf9d7f22dc |
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1 """Class for the various animals in the game""" |
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2 |
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3 from pgu.vid import Sprite |
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4 from pgu.algo import getline |
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5 |
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6 import imagecache |
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7 import tiles |
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8 from misc import Position |
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9 |
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10 class Animal(Sprite): |
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11 """Base class for animals""" |
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12 |
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13 def __init__(self, image_left, image_right, tile_pos): |
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14 # Create the animal somewhere far off screen |
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15 Sprite.__init__(self, image_left, (-1000, -1000)) |
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16 self.image_left = image_left |
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17 self.image_right = image_right |
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18 self.pos = Position(tile_pos[0], tile_pos[1]) |
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19 |
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20 def loop(self, tv, _sprite): |
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21 ppos = tv.tile_to_view(self.pos.to_tuple()) |
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22 self.rect.x = ppos[0] |
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23 self.rect.y = ppos[1] |
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24 |
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25 def move(self, state): |
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26 """Given the game state, return a new position for the object""" |
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27 # Default is not to move |
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28 pass |
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29 |
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30 def _fix_face(self, final_pos): |
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31 """Set the face correctly""" |
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32 if final_pos.left_of(self.pos): |
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33 self.setimage(self.image_left) |
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34 elif final_pos.right_of(self.pos): |
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35 self.setimage(self.image_right) |
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36 |
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37 class Chicken(Animal): |
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38 """A chicken""" |
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39 |
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40 def __init__(self, pos): |
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41 image_left = imagecache.load_image('sprites/chkn.png') |
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42 image_right = imagecache.load_image('sprites/chkn.png', |
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43 ("right_facing",)) |
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44 Animal.__init__(self, image_left, image_right, pos) |
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45 |
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46 def move(self, gameboard): |
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47 """A free chicken will move away from other free chickens""" |
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48 pass |
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49 |
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50 class Egg(Animal): |
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51 """An egg""" |
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52 |
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53 def __init__(self, pos): |
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54 image = imagecache.load_image('sprites/egg.png') |
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55 Animal.__init__(self, image, image, pos) |
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56 |
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57 # Eggs don't move |
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58 |
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59 class Fox(Animal): |
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60 """A fox""" |
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61 |
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62 costs = { |
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63 # weighting for movement calculation |
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64 'grassland' : 2, |
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65 'woodland' : 1, # Try to keep to the woods if possible |
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66 'broken fence' : 1, |
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67 'fence' : 10, |
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68 'guardtower' : 1, # We can pass under towers |
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69 'henhouse' : 1, |
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70 } |
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71 |
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72 def __init__(self, pos): |
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73 image_left = imagecache.load_image('sprites/fox.png') |
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74 image_right = imagecache.load_image('sprites/fox.png', |
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75 ("right_facing",)) |
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76 Animal.__init__(self, image_left, image_right, pos) |
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77 self.landmarks = [self.pos] |
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78 self.hunting = True |
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79 self.dig_pos = None |
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80 self.tick = 0 |
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81 |
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82 def _cost_path(self, path, gameboard): |
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83 """Calculate the cost of a path""" |
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84 total = 0 |
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85 for pos in path: |
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86 if gameboard.in_bounds(pos): |
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87 this_tile = gameboard.tv.get(pos.to_tuple()) |
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88 cost = self.costs.get(tiles.TILE_MAP[this_tile], 100) |
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89 else: |
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90 cost = 100 # Out of bounds is expensive |
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91 total += cost |
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92 return total |
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93 |
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94 def _gen_path(self, start_pos, final_pos): |
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95 """Construct a direct path from start_pos to final_pos, |
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96 excluding start_pos""" |
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97 if abs(start_pos.x - final_pos.x) < 2 and \ |
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98 abs(start_pos.y - final_pos.y) < 2: |
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99 # pgu gets this case wrong on occasion. |
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100 return [final_pos] |
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101 start = start_pos.to_tuple() |
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102 end = final_pos.to_tuple() |
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103 points = getline(start, end) |
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104 points.remove(start) # exclude start_pos |
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105 if end not in points: |
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106 # Rounding errors in getline cause this |
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107 points.append(end) |
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108 return [Position(x[0], x[1]) for x in points] |
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109 |
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110 def _find_best_path_step(self, final_pos, gameboard): |
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111 """Find the cheapest path to final_pos, and return the next step |
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112 along the path.""" |
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113 # We calculate the cost of the direct path |
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114 direct_path = self._gen_path(self.pos, final_pos) |
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115 min_cost = self._cost_path(direct_path, gameboard) |
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116 min_path = direct_path |
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117 # is there a point nearby that gives us a cheaper direct path? |
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118 poss = [Position(x, y) for x in range(self.pos.x - 2, self.pos.x + 3) |
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119 for y in range(self.pos.y - 2, self.pos.y + 3)] |
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120 for start in poss: |
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121 if start == self.pos: |
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122 continue # don't repeat work we don't need to |
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123 cand_path = self._gen_path(self.pos, start) + \ |
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124 self._gen_path(start, final_pos) |
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125 cost = self._cost_path(cand_path, gameboard) |
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126 if cost < min_cost: |
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127 min_cost = cost |
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128 min_path = cand_path |
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129 if not min_path: |
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130 return final_pos |
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131 return min_path[0] |
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132 |
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133 def _find_path_to_woodland(self, gameboard): |
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134 """Dive back to woodland through the landmarks""" |
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135 # find the closest point to our current location in walked path |
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136 if self.pos == self.landmarks[-1]: |
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137 if len(self.landmarks) > 1: |
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138 self.landmarks.pop() # Moving to the next landmark |
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139 else: |
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140 # Safely back at the start |
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141 return self.pos |
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142 return self._find_best_path_step(self.landmarks[-1], gameboard) |
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143 |
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144 def _find_path_to_chicken(self, gameboard): |
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145 """Find the path to the closest chicken""" |
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146 # Find the closest chicken |
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147 min_dist = 999 |
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148 closest = None |
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149 for chicken in gameboard.chickens: |
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150 dist = chicken.pos.dist(self.pos) |
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151 if dist < min_dist: |
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152 min_dist = dist |
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153 closest = chicken |
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154 if not closest: |
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155 # No more chickens, so leave |
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156 self.hunting = False |
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157 return self.pos |
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158 if closest.pos == self.pos: |
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159 # Caught a chicken |
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160 gameboard.remove_chicken(closest) |
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161 self.hunting = False |
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162 return self.pos |
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163 return self._find_best_path_step(closest.pos, gameboard) |
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164 |
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165 def _update_pos(self, gameboard, new_pos): |
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166 """Update the position, making sure we don't step on other foxes""" |
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167 final_pos = new_pos |
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168 moves = [Position(x, y) for x in range(self.pos.x-1, self.pos.x + 2) |
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169 for y in range(self.pos.y-1, self.pos.y + 2)] |
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170 blocked = False |
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171 for fox in gameboard.foxes: |
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172 if fox is not self and fox.pos == new_pos: |
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173 blocked = True |
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174 if fox.pos in moves: |
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175 moves.remove(fox.pos) |
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176 if blocked: |
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177 # find the closest point in moves to new_pos that's not a fence |
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178 final_pos = None |
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179 dist = 10 |
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180 for poss in moves: |
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181 this_tile = gameboard.tv.get(poss.to_tuple()) |
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182 new_dist = poss.dist(new_pos) |
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183 if new_dist < dist: |
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184 dist = new_dist |
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185 final_pos = poss |
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186 this_tile = gameboard.tv.get(final_pos.to_tuple()) |
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187 if tiles.TILE_MAP[this_tile] == 'broken fence' and self.hunting: |
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188 # We'll head back towards the holes we make/find |
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189 self.landmarks.append(final_pos) |
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190 elif tiles.TILE_MAP[this_tile] == 'fence' and not self.dig_pos: |
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191 self.tick = 5 |
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192 self.dig_pos = final_pos |
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193 return self.pos |
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194 return final_pos |
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195 |
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196 def move(self, gameboard): |
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197 """Foxes will aim to move towards the closest henhouse or free |
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198 chicken""" |
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199 if self.dig_pos: |
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200 if self.tick: |
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201 # We're digging through the fence |
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202 self.tick -= 1 |
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203 # Check the another fox hasn't dug a hole for us |
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204 # We're top busy digging to notice if a hole appears nearby, |
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205 # but we'll notice if the fence we're digging vanishes |
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206 this_tile = gameboard.tv.get(self.dig_pos.to_tuple()) |
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207 if tiles.TILE_MAP[this_tile] == 'broken fence': |
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208 self.tick = 0 |
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209 else: |
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210 # We've dug through the fence, so make a hole |
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211 gameboard.tv.set(self.dig_pos.to_tuple(), |
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212 tiles.REVERSE_TILE_MAP['broken fence']) |
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213 self.dig_pos = None |
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214 return |
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215 if self.hunting: |
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216 desired_pos = self._find_path_to_chicken(gameboard) |
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217 else: |
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218 desired_pos = self._find_path_to_woodland(gameboard) |
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219 final_pos = self._update_pos(gameboard, desired_pos) |
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220 self._fix_face(final_pos) |
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221 self.pos = final_pos |
29 | 222 |
223 |