Mercurial > mamba

annotate mamba/snake.py @ 203:8009742103e7

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Add a segment when driving over the big rat.
author Simon Cross <hodgestar@gmail.com>
date Wed, 14 Sep 2011 20:26:39 +0200
parents 498c1d659a94
children 2b5956bedf64
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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 from pygame.sprite import Group, spritecollide
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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
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7 from mamba.engine import SnakeDiedEvent
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8 from mamba import mutators
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9
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10
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11 class Snake(object):
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12
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13 def __init__(self, tile_pos, orientation):
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14 self.segments = self.create_segments(tile_pos, orientation)
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15 self.pending_segments = [] # segments waiting to be added
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16 self.segment_group = Group()
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17 self.segment_group.add(*reversed(self.segments))
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18 self.set_orientation(orientation)
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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
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22
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23 head = property(fget=lambda self: self.segments[0])
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24 tail = property(fget=lambda self: self.segments[-1])
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25
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26 def create_segments(self, tile_pos, orientation):
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27 tx, ty = tile_pos
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28 dx, dy = orientation
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29 segments = []
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30 for cls in [Head] + [Body] * 10 + [Tail]:
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31 segments.append(cls((tx, ty)))
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32 return segments
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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 self.pending_segments.append(segment)
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38
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39 def remove_segment(self, segment=None):
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40 if segment is None:
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41 if len(self.segments) < 3:
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42 return
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43 segment = self.segments[-2]
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44 try:
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45 idx = self.segments.index(segment)
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46 except IndexError:
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47 return
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48 self.shiftup_segments(idx, segment.get_tile_state())
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49 del self.segments[idx]
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50 segment.kill()
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51
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52 def shiftup_segments(self, idx, state):
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53 for segment in self.segments[idx:]:
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54 next_state = segment.get_tile_state()
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55 segment.shift_tile(state)
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56 state = next_state
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57
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58 def draw(self, surface):
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59 self.segment_group.draw(surface)
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60
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61 def update(self, dt, world):
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62 ds = dt * self.speed + self.frac_ds
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63 ds, self.frac_ds = divmod(ds, 1)
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64 ds = int(ds)
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65 while True:
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66 tile_state = self.head.get_tile_state()
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67 shifted, ds = self.head.shift_head(ds)
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68 if not shifted:
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69 break
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70 if self.pending_segments:
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71 new_segment = self.pending_segments.pop(0)
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72 self.segments.insert(1, new_segment)
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73 self.segment_group.add(new_segment)
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74 new_segment.shift_tile(tile_state)
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75 print len(self.segments)
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76 else:
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77 self.shiftup_segments(1, tile_state)
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78 if not self.check_uturn():
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79 self.head.set_orientation(self.orientation)
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80
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81 for segment in self.segments:
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82 segment.shift_pixels(ds)
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83 world.interact(segment)
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84
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85 def check_uturn(self):
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86 if len(self.segments) > 1:
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87 neck_x, neck_y = self.segments[1].tile_pos
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88 head_x, head_y = self.head.tile_pos
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89 if (head_x + self.orientation[0] == neck_x and
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90 head_y + self.orientation[1] == neck_y):
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91 # Don't allow the snake to go back on itself
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92 # immediately. More creative self-inflicted
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93 # deaths are allowed though.
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94 return True
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95 return False
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96
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97 def set_orientation(self, orientation):
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98 self.orientation = orientation
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99
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100 def crash(self):
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101 SnakeDiedEvent.post()
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102
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103 def mutate(self, mutation):
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104 self.mutation = mutation
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105
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106 def can_swim(self):
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107 return self.mutation == 'amphibious'
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108
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109
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110 class Segment(BaseSprite):
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111
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112 GREEN = mutators.SNAKE_GREEN
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113 BLUE = mutators.BLUE
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114 RED = mutators.RED
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115 YELLOW = mutators.YELLOW
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116
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117 _detail_mutators = ()
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118
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119 is_head = False
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120
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121 def __init__(self, image_name, tile_pos):
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122 super(Segment, self).__init__()
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123 self.set_base_image(image_name)
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124 self._colour_overlay = self.GREEN
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125 self.orientation = UP
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126
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127 self.make_images()
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128 self.update_image()
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129 self.set_tile_pos(tile_pos)
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130 self.on_tiles = []
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131
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132 def filter_collisions(self, group):
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133 collide = []
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134 tiles = spritecollide(self, group, False)
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135 for tile in tiles:
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136 if tile not in self.on_tiles:
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137 collide.append(tile)
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138 self.on_tiles = tiles
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139 return collide
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140
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141 def set_base_image(self, image_name):
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142 self._base_image = "/".join(["snake", image_name])
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143
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144 def make_images(self):
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145 self._images = {}
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146 for orientation, muts in [
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147 (RIGHT, (mutators.RIGHT,)),
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148 (LEFT, (mutators.LEFT,)),
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149 (UP, (mutators.UP,)),
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150 (DOWN, (mutators.DOWN,)),
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151 ]:
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152 all_muts = (self._colour_overlay,) + self._detail_mutators + muts
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153 self._images[orientation] = self.load_image(self._base_image,
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154 all_muts)
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155
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156 def update_image(self):
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157 self.image = self._images[self.orientation]
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158
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159 def set_orientation(self, orientation):
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160 self.orientation = orientation
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161 self.update_image()
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162
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163 def set_colour(self, colour_overlay):
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164 self._colour_overlay = colour_overlay
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165 self.make_images()
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166 self.update_image()
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167
177
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168 def get_tile_state(self):
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169 return self.tile_pos, self.orientation
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170
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171 def shift_tile(self, tile_state):
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172 """Shift this segment to the tile the other one was on.
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173
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174 Also reset the position to be the center of the tile.
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175 """
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176 tile_pos, orientation = tile_state
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177 self.set_tile_pos(tile_pos)
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178 self.orientation = orientation
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179
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180 def shift_pixels(self, distance):
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181 """Shift this segment a number of pixels."""
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182 dx, dy = self.orientation
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183 dx, dy = distance * dx, distance * dy
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184 self.rect = self.rect.move(dx, dy)
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185
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186
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187 class Head(Segment):
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188 CLOSED = "snake-head"
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189 OPEN = "snake-head-mouth-open-r"
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190 EYE = mutators.Overlay("tiles/common/snake/snake-head-eye-r.png")
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191 TONGUE = mutators.Overlay("tiles/common/snake/snake-head-tongue-r.png")
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192
182
0a955d2536f0 Painted Jezebel! (Assuming you name your snake Jezebel.)
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193 is_head = True
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194
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195 def __init__(self, tile_pos):
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196 self._detail_mutators = (self.EYE,)
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197 super(Head, self).__init__(self.CLOSED, tile_pos)
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198
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199 def mouth_open(self):
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200 self.set_base_image(self.OPEN)
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201 self.make_images()
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202 self.update_image()
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203
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204 def mouth_closed(self):
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205 self.set_base_image(self.CLOSED)
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206 self.make_images()
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207 self.update_image()
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208
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209 def tongue_out(self):
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210 self._detail_mutators = (self.EYE, self.TONGUE)
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211 self.make_images()
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212 self.update_image()
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213
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214 def tongue_in(self):
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215 self._detail_mutators = (self.EYE,)
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216 self.make_images()
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217 self.update_image()
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218
177
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219 def shift_head(self, ds):
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220 """Shift the head a number of pixels in the direction of it
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221 orientation.
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222 """
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223 dx, dy = self.orientation
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224 TX, TY = TILE_SIZE
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225 rx, ry = self.rect.left, self.rect.top
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226 tx, ty = self.tile_pos
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227 # WARNING: Tri-state logic ahead
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228 # (Tri-state logic is the mamba's natural habitat)
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229 if dx != 0:
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230 newdx = rx + ds * dx
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231 newtx = newdx / TX
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232 if newtx > tx:
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233 self.set_tile_pos((tx + 1, ty))
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234 ds = newdx - self.rect.left
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235 return True, ds
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236 elif newtx < tx - 1:
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237 self.set_tile_pos((tx - 1, ty))
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238 ds = self.rect.left - newdx
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239 return True, ds
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240 else:
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241 newdy = ry + ds * dy
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242 newty = newdy / TY
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243 if newty > ty:
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244 self.set_tile_pos((tx, ty + 1))
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245 ds = newdy - self.rect.top
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246 return True, ds
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247 elif newty < ty - 1:
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248 self.set_tile_pos((tx, ty - 1))
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249 ds = self.rect.top - newdy
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250 return True, ds
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251 return False, ds
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252
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253
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254 class Body(Segment):
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255 def __init__(self, tile_pos):
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256 super(Body, self).__init__("snake-body", tile_pos)
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257
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258
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259 class Tail(Segment):
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260 def __init__(self, tile_pos):
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261 super(Tail, self).__init__("snake-tail", tile_pos)