Mercurial > mamba

annotate mamba/snake.py @ 218:10804ae58066

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Open mouth when eating things
author Stefano Rivera <stefano@rivera.za.net>
date Wed, 14 Sep 2011 21:59:00 +0200
parents 874eb26aad10
children 3a652f048f57
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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, LevelCompletedEvent
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8 from mamba import mutators
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9
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10
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11 INITIAL_SEGMENT_COUNT = 4
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12
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13
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14 class Snake(object):
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15
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16 def __init__(self, tile_pos, orientation):
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17 self.segments = self.create_segments(tile_pos, orientation)
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18 self.pending_segments = [] # segments waiting to be added
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19 self.segment_group = Group()
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20 self.segment_group.add(*reversed(self.segments))
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21 self.set_orientation(orientation)
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22 self.speed = 120.0 # pixel / s
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23 self.frac_ds = 0.0
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24 self.mutation = None
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25
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26 head = property(fget=lambda self: self.segments[0])
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27 tail = property(fget=lambda self: self.segments[-1])
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28
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29 def create_segments(self, tile_pos, orientation):
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30 tx, ty = tile_pos
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31 dx, dy = orientation
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32 segments = []
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33 for cls in [Head] + [Body] * INITIAL_SEGMENT_COUNT + [Tail]:
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34 segments.append(cls((tx, ty)))
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35 return segments
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36
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37 def add_segment(self, segment=None):
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38 if segment is None:
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39 segment = Body((0, 0))
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40 segment.set_colour(self.head.colour)
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41 self.pending_segments.append(segment)
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42
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43 def remove_segment(self, segment=None):
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44 if segment is None:
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45 if len(self.segments) < 3:
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46 return
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47 segment = self.segments[-2]
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48 try:
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49 idx = self.segments.index(segment)
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50 except IndexError:
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51 return
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52 self.shiftup_segments(idx, segment.get_tile_state())
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53 del self.segments[idx]
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54 segment.kill()
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55
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56 def shiftup_segments(self, idx, state):
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57 for segment in self.segments[idx:]:
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58 next_state = segment.get_tile_state()
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59 segment.shift_tile(state)
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60 state = next_state
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61
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62 def draw(self, surface):
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63 self.segment_group.draw(surface)
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64
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65 def update(self, dt, world):
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66 ds = dt * self.speed + self.frac_ds
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67 ds, self.frac_ds = divmod(ds, 1)
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68 ds = int(ds)
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69 while True:
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70 tile_state = self.head.get_tile_state()
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71 shifted, ds = self.head.shift_head(ds)
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72 if shifted:
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73 self.head.mouth_close()
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74 else:
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75 break
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76 if self.pending_segments:
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77 new_segment = self.pending_segments.pop(0)
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78 self.segments.insert(1, new_segment)
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79 self.segment_group.add(new_segment)
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80 new_segment.shift_tile(tile_state)
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81 for segment in self.segments[2:]:
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82 segment.shift_tile(segment.get_tile_state())
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83 else:
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84 self.shiftup_segments(1, tile_state)
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85 if not self.check_uturn():
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86 self.head.set_orientation(self.orientation)
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87
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88 for segment in self.segments:
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89 segment.shift_pixels(ds)
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90 world.interact(segment)
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91
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92 def check_uturn(self):
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93 if len(self.segments) > 1:
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94 neck_x, neck_y = self.segments[1].tile_pos
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95 head_x, head_y = self.head.tile_pos
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96 if (head_x + self.orientation[0] == neck_x and
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97 head_y + self.orientation[1] == neck_y):
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98 # Don't allow the snake to go back on itself
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99 # immediately. More creative self-inflicted
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100 # deaths are allowed though.
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101 return True
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102 return False
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103
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104 def set_orientation(self, orientation):
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105 self.orientation = orientation
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106
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107 def crash(self):
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108 SnakeDiedEvent.post()
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109
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110 def exit_level(self):
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111 LevelCompletedEvent.post()
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112
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113 def mutate(self, mutation):
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114 self.mutation = mutation
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115
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116 def can_swim(self):
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117 return self.mutation == 'amphibious'
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118
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119
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120 class Segment(BaseSprite):
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121
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122 GREEN = mutators.SNAKE_GREEN
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123 BLUE = mutators.BLUE
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124 RED = mutators.RED
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125 YELLOW = mutators.YELLOW
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126
131
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127 _detail_mutators = ()
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128
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129 is_head = False
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130
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131 def __init__(self, image_name, tile_pos):
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132 super(Segment, self).__init__()
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133 self.set_base_image(image_name)
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134 self.colour = self.GREEN
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135 self.orientation = UP
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136
131
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137 self.make_images()
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138 self.update_image()
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139 self.set_tile_pos(tile_pos)
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140 self.on_tiles = []
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141
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142 def filter_collisions(self, group):
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143 collide = []
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144 tiles = spritecollide(self, group, False)
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145 for tile in tiles:
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146 if tile not in self.on_tiles:
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147 collide.append(tile)
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148 self.on_tiles = tiles
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149 return collide
125
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150
153
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151 def set_base_image(self, image_name):
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152 self._base_image = "/".join(["snake", image_name])
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153
131
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154 def make_images(self):
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155 self._images = {}
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156 for orientation, muts in [
199
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157 (RIGHT, (mutators.RIGHT,)),
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158 (LEFT, (mutators.LEFT,)),
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159 (UP, (mutators.UP,)),
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160 (DOWN, (mutators.DOWN,)),
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161 ]:
205
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162 all_muts = (self.colour,) + self._detail_mutators + muts
141
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163 self._images[orientation] = self.load_image(self._base_image,
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164 all_muts)
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165
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166 def update_image(self):
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167 self.image = self._images[self.orientation]
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168
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169 def set_orientation(self, orientation):
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170 self.orientation = orientation
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171 self.update_image()
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172
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173 def set_colour(self, colour_overlay):
205
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174 self.colour = colour_overlay
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175 self.make_images()
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176 self.update_image()
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177
177
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178 def get_tile_state(self):
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179 return self.tile_pos, self.orientation
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180
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181 def shift_tile(self, tile_state):
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182 """Shift this segment to the tile the other one was on.
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183
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184 Also reset the position to be the center of the tile.
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185 """
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186 tile_pos, orientation = tile_state
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187 self.set_tile_pos(tile_pos)
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188 self.orientation = orientation
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189
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190 def shift_pixels(self, distance):
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191 """Shift this segment a number of pixels."""
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192 dx, dy = self.orientation
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193 dx, dy = distance * dx, distance * dy
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194 self.rect = self.rect.move(dx, dy)
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195
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196
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197 class Head(Segment):
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198 CLOSED = "snake-head"
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199 OPEN = "snake-head-mouth-open-r"
212
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200 EYE = mutators.Overlay("snake/snake-head-eye-r")
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201 TONGUE = mutators.Overlay("snake/snake-head-tongue-r")
153
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202
182
0a955d2536f0 Painted Jezebel! (Assuming you name your snake Jezebel.)
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parents: 181
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203 is_head = True
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204
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205 def __init__(self, tile_pos):
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206 self._detail_mutators = (self.EYE,)
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207 super(Head, self).__init__(self.CLOSED, tile_pos)
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208
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209 def mouth_open(self):
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210 self.set_base_image(self.OPEN)
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211 self.make_images()
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212 self.update_image()
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213
218
10804ae58066 Open mouth when eating things
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parents: 217
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214 def mouth_close(self):
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215 self.set_base_image(self.CLOSED)
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216 self.make_images()
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217 self.update_image()
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218
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219 def tongue_out(self):
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220 self._detail_mutators = (self.EYE, self.TONGUE)
131
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221 self.make_images()
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222 self.update_image()
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223
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224 def tongue_in(self):
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225 self._detail_mutators = (self.EYE,)
131
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226 self.make_images()
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227 self.update_image()
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228
177
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229 def shift_head(self, ds):
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230 """Shift the head a number of pixels in the direction of it
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231 orientation.
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232 """
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233 dx, dy = self.orientation
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234 TX, TY = TILE_SIZE
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235 rx, ry = self.rect.left, self.rect.top
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236 tx, ty = self.tile_pos
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237 # WARNING: Tri-state logic ahead
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238 # (Tri-state logic is the mamba's natural habitat)
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diff changeset
239 if dx != 0:
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240 newdx = rx + ds * dx
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241 newtx = newdx / TX
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242 if newtx > tx:
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243 self.set_tile_pos((tx + 1, ty))
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244 ds = newdx - self.rect.left
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245 return True, ds
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246 elif newtx < tx - 1:
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247 self.set_tile_pos((tx - 1, ty))
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248 ds = self.rect.left - newdx
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249 return True, ds
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250 else:
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251 newdy = ry + ds * dy
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252 newty = newdy / TY
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253 if newty > ty:
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254 self.set_tile_pos((tx, ty + 1))
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255 ds = newdy - self.rect.top
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256 return True, ds
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257 elif newty < ty - 1:
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258 self.set_tile_pos((tx, ty - 1))
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259 ds = self.rect.top - newdy
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260 return True, ds
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261 return False, ds
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diff changeset
262
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263
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264 class Body(Segment):
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265 def __init__(self, tile_pos):
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266 super(Body, self).__init__("snake-body", tile_pos)
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267
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268
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269 class Tail(Segment):
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270 def __init__(self, tile_pos):
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271 super(Tail, self).__init__("snake-tail", tile_pos)