Mercurial > mamba

annotate mamba/snake.py @ 312:8a6ef789bd45

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Cap at three moves, not two.
author Jeremy Thurgood <firxen@gmail.com>
date Fri, 16 Sep 2011 18:42:37 +0200
parents 3b7288064935
children cd544a311f11
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rev   line source
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b1019923cb12 Direction control for snake.
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1 """The player snake object."""
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2
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3 import random
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4
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5 from pygame.sprite import Group, spritecollide
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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
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9 from mamba.engine import SnakeDiedEvent, LevelCompletedEvent
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10 from mamba.sound import load_sound, play_sound
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11 from mamba import mutators
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12
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13
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14 INITIAL_SEGMENT_COUNT = 4
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16
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17 class Snake(object):
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18
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19 def __init__(self, tile_pos, orientation):
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20 load_sound('crash', 'sounds/crash.ogg')
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21 self.segments = self.create_segments(tile_pos, orientation)
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22 self.pending_segments = [] # segments waiting to be added
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23 self.segment_group = Group()
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24 self.segment_group.add(*reversed(self.segments))
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25 self.orientation = orientation
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26 self.speed = 120.0 # pixel / s
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27 self.frac_ds = 0.0
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28 self.mutation = None
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29 self.coiled = True
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30 self._orientation_changes = []
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31
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32 head = property(fget=lambda self: self.segments[0])
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33 tail = property(fget=lambda self: self.segments[-1])
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34
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35 def create_segments(self, tile_pos, orientation):
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36 tx, ty = tile_pos
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37 dx, dy = orientation
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38 segments = []
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39 for cls in [Head] + [Body] * INITIAL_SEGMENT_COUNT + [Tail]:
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40 segments.append(cls((tx, ty)))
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41 return segments
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42
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43 def add_segment(self, segment=None):
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44 if segment is None:
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45 segment = Body((0, 0))
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46 segment.set_colour(self.head.colour)
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47 self.pending_segments.append(segment)
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48
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49 def remove_segment(self, segment=None):
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50 if segment is None:
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51 if len(self.segments) < 3:
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52 return
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53 segment = self.segments[-2]
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54 try:
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55 idx = self.segments.index(segment)
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56 except IndexError:
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57 return
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58 self.shiftup_segments(idx, segment.get_tile_state())
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59 del self.segments[idx]
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60 segment.kill()
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61
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62 def shiftup_segments(self, idx, state):
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63 for segment in self.segments[idx:]:
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64 next_state = segment.get_tile_state()
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65 segment.shift_tile(state)
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66 state = next_state
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67
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68 def draw(self, surface):
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69 self.segment_group.draw(surface)
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70
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71 def update(self, dt, world):
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72 ds = dt * self.speed + self.frac_ds
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73 ds, self.frac_ds = divmod(ds, 1)
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74 ds = int(ds)
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75 while True:
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76 tile_state = self.head.get_tile_state()
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77 shifted, ds = self.head.shift_head(ds)
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78 if shifted:
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79 self.coiled = False
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80 self.head.shifted_tile()
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81 self._pop_orientation_queue()
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82 else:
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83 break
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84 if self.pending_segments:
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85 new_segment = self.pending_segments.pop(0)
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86 self.segments.insert(1, new_segment)
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87 self.segment_group.add(new_segment)
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88 new_segment.shift_tile(tile_state)
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89 for segment in self.segments[2:]:
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90 segment.shift_tile(segment.get_tile_state())
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91 else:
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92 self.shiftup_segments(1, tile_state)
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93
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94 self.check_self_crash()
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95 for segment in self.segments:
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96 segment.shift_pixels(ds)
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97 world.interact(segment)
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98
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99 def send_new_direction(self, orientation):
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100 self._orientation_changes.append(orientation)
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101 # Cap queue length:
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102 self._orientation_changes = self._orientation_changes[:3]
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103
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104 def _pop_orientation_queue(self):
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105 while self._orientation_changes:
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106 orientation = self._orientation_changes.pop(0)
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107 if ((0 == orientation[0] == self.head.orientation[0])
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108 or (0 == orientation[1] == self.head.orientation[1])):
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109 continue
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110 self.set_orientation(orientation)
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111 break
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112
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113 def set_orientation(self, orientation):
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114 self.orientation = orientation
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115 self.head.set_orientation(orientation)
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116
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117 def check_self_crash(self):
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118 if self.coiled:
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119 return
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120 collides = spritecollide(self.head, self.segment_group, False)
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121 if [s for s in collides if s not in self.segments[:2]]:
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122 self.crash('You hit yourself!')
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123
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124 def crash(self, reason='You hit something'):
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125 play_sound('crash')
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126 SnakeDiedEvent.post(reason)
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127
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128 def exit_level(self):
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129 LevelCompletedEvent.post()
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130
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131 def mutate(self, mutation):
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132 self.mutation = mutation
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133 self.tail.show_mutation(mutation)
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134
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135 def can_swim(self):
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136 return self.mutation == 'amphibious'
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137
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138 def flame_retardant(self):
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139 return self.mutation == 'flame-retardant'
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140
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141 def adjust_speed(self, delta):
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142 self.speed += delta
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143 self.speed = max(self.speed, 60)
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144 self.speed = min(self.speed, 180)
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145
98
7ce2d2d8381a Refactor BaseSprite.
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146
110
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diff changeset
147 class Segment(BaseSprite):
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148
195
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diff changeset
149 GREEN = mutators.SNAKE_GREEN
125
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150 BLUE = mutators.BLUE
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151 RED = mutators.RED
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152 YELLOW = mutators.YELLOW
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153
131
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154 _detail_mutators = ()
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155
182
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156 is_head = False
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157
110
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158 def __init__(self, image_name, tile_pos):
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159 super(Segment, self).__init__()
153
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160 self.set_base_image(image_name)
205
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161 self.colour = self.GREEN
199
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162 self.orientation = UP
125
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163
131
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164 self.make_images()
125
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165 self.update_image()
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166 self.set_tile_pos(tile_pos)
188
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167 self.on_tiles = []
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168
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169 def filter_collisions(self, group):
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170 collide = []
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171 tiles = spritecollide(self, group, False)
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172 for tile in tiles:
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173 if tile not in self.on_tiles:
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174 collide.append(tile)
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175 self.on_tiles = tiles
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176 return collide
125
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177
153
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178 def set_base_image(self, image_name):
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179 self._base_image = "/".join(["snake", image_name])
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180
131
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181 def make_images(self):
110
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182 self._images = {}
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183 for orientation, muts in [
199
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184 (RIGHT, (mutators.RIGHT,)),
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185 (LEFT, (mutators.LEFT,)),
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186 (UP, (mutators.UP,)),
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187 (DOWN, (mutators.DOWN,)),
110
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188 ]:
205
2b5956bedf64 Set colour of default new segment to colour of snake head.
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189 all_muts = (self.colour,) + self._detail_mutators + muts
141
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diff changeset
190 self._images[orientation] = self.load_image(self._base_image,
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diff changeset
191 all_muts)
125
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192
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193 def update_image(self):
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194 self.image = self._images[self.orientation]
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195
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196 def set_orientation(self, orientation):
177
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197 self.orientation = orientation
125
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198 self.update_image()
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199
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200 def set_colour(self, colour_overlay):
205
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201 self.colour = colour_overlay
131
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202 self.make_images()
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203 self.update_image()
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204
177
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205 def get_tile_state(self):
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206 return self.tile_pos, self.orientation
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207
252
8198492745b1 Try not to let head wander during teleporting (it's bad for your health).
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208 def get_distance(self):
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209 rx, ry = self.rect.topleft
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210 x, y = tile_sizify(self.tile_pos)
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211 return max(abs(rx - x), abs(ry - y))
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212
177
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213 def shift_tile(self, tile_state):
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214 """Shift this segment to the tile the other one was on.
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215
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diff changeset
216 Also reset the position to be the center of the tile.
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217 """
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218 tile_pos, orientation = tile_state
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diff changeset
219 self.set_tile_pos(tile_pos)
295
43ac21d498a1 Fix segment orientation.
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diff changeset
220 self.set_orientation(orientation)
177
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diff changeset
221
252
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diff changeset
222 def shift_tile_and_pixels(self, tile_state):
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diff changeset
223 ds = self.get_distance()
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224 self.shift_tile(tile_state)
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diff changeset
225 self.shift_pixels(ds)
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diff changeset
226
221
3a652f048f57 Tssss, I smell rats
Stefano Rivera <stefano@rivera.za.net>
parents: 218
diff changeset
227 def shifted_tile(self):
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diff changeset
228 pass
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229
177
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diff changeset
230 def shift_pixels(self, distance):
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diff changeset
231 """Shift this segment a number of pixels."""
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diff changeset
232 dx, dy = self.orientation
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diff changeset
233 dx, dy = distance * dx, distance * dy
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diff changeset
234 self.rect = self.rect.move(dx, dy)
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diff changeset
235
223
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diff changeset
236 def shift_head(self, ds):
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diff changeset
237 """Shift the head a number of pixels in the direction of it
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diff changeset
238 orientation.
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diff changeset
239 """
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diff changeset
240 dx, dy = self.orientation
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parents: 221
diff changeset
241 TX, TY = TILE_SIZE
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diff changeset
242 rx, ry = self.rect.left, self.rect.top
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diff changeset
243 tx, ty = self.tile_pos
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diff changeset
244 # WARNING: Tri-state logic ahead
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diff changeset
245 # (Tri-state logic is the mamba's natural habitat)
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diff changeset
246 if dx != 0:
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diff changeset
247 newdx = rx + ds * dx
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diff changeset
248 newtx = newdx / TX
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diff changeset
249 if newtx > tx:
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diff changeset
250 self.set_tile_pos((tx + 1, ty))
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diff changeset
251 ds = newdx - self.rect.left
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diff changeset
252 return True, ds
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diff changeset
253 elif newtx < tx - 1:
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diff changeset
254 self.set_tile_pos((tx - 1, ty))
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diff changeset
255 ds = self.rect.left - newdx
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diff changeset
256 return True, ds
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diff changeset
257 else:
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diff changeset
258 newdy = ry + ds * dy
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diff changeset
259 newty = newdy / TY
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diff changeset
260 if newty > ty:
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parents: 221
diff changeset
261 self.set_tile_pos((tx, ty + 1))
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diff changeset
262 ds = newdy - self.rect.top
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diff changeset
263 return True, ds
c3018764942a Move shift_head onto base segment so that head is less special (in preparation for snake disappearing down the exit).
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parents: 221
diff changeset
264 elif newty < ty - 1:
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diff changeset
265 self.set_tile_pos((tx, ty - 1))
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diff changeset
266 ds = self.rect.top - newdy
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diff changeset
267 return True, ds
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diff changeset
268 return False, ds
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diff changeset
269
110
e6299eb296ce Draw the world!
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diff changeset
270
e6299eb296ce Draw the world!
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diff changeset
271 class Head(Segment):
153
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diff changeset
272 CLOSED = "snake-head"
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diff changeset
273 OPEN = "snake-head-mouth-open-r"
212
e768056b0588 Refactor tile image loading stuff. More magic is good, right?
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parents: 206
diff changeset
274 EYE = mutators.Overlay("snake/snake-head-eye-r")
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diff changeset
275 TONGUE = mutators.Overlay("snake/snake-head-tongue-r")
153
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diff changeset
276
182
0a955d2536f0 Painted Jezebel! (Assuming you name your snake Jezebel.)
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diff changeset
277 is_head = True
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diff changeset
278
110
e6299eb296ce Draw the world!
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diff changeset
279 def __init__(self, tile_pos):
153
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diff changeset
280 self._detail_mutators = (self.EYE,)
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diff changeset
281 super(Head, self).__init__(self.CLOSED, tile_pos)
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diff changeset
282
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283 def mouth_open(self):
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284 self.set_base_image(self.OPEN)
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285 self.make_images()
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286 self.update_image()
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287
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288 def mouth_close(self):
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289 self.set_base_image(self.CLOSED)
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290 self.make_images()
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291 self.update_image()
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292
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293 def tongue_out(self):
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294 self._detail_mutators = (self.EYE, self.TONGUE)
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295 self.make_images()
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296 self.update_image()
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297
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298 def tongue_in(self):
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299 self._detail_mutators = (self.EYE,)
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300 self.make_images()
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301 self.update_image()
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302
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303 def shifted_tile(self):
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304 if random.random() < 0.02:
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305 self.mouth_open()
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306 self.tongue_out()
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307 else:
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308 self.mouth_close()
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309 self.tongue_in()
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310
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311
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312 class Body(Segment):
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313 def __init__(self, tile_pos):
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314 super(Body, self).__init__("snake-body", tile_pos)
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315
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316
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317 class Tail(Segment):
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318 INDICATORS = {
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319 "flame-retardant": mutators.Overlay("snake/snake-tail-fire-r"),
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320 "amphibious": mutators.Overlay("snake/snake-tail-puddle-r"),
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321 }
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322
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323 def __init__(self, tile_pos):
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324 super(Tail, self).__init__("snake-tail-r", tile_pos)
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325
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326 def show_mutation(self, mutation):
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327 self._detail_mutators = (self.INDICATORS[mutation],)
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328 self.make_images()
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329 self.update_image()