Mercurial > mamba
annotate mamba/snake.py @ 267:1e8dca95c48a
Hook up hot-keys in editor for jerith
| author | Neil Muller <drnlmuller@gmail.com> |
|---|---|
| date | Thu, 15 Sep 2011 12:54:16 +0200 |
| parents | c7c9d71ac6ea |
| children | 56cd71696dff |
| rev | line source |
|---|---|
| 78 | 1 """The player snake object.""" |
| 2 | |
| 221 | 3 import random |
| 4 | |
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5 from pygame.sprite import Group, spritecollide |
| 110 | 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 |
| 213 | 9 from mamba.engine import SnakeDiedEvent, LevelCompletedEvent |
| 98 | 10 from mamba import mutators |
| 78 | 11 |
| 12 | |
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13 INITIAL_SEGMENT_COUNT = 4 |
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14 |
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15 |
| 110 | 16 class Snake(object): |
| 78 | 17 |
| 18 def __init__(self, tile_pos, orientation): | |
| 110 | 19 self.segments = self.create_segments(tile_pos, orientation) |
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20 self.pending_segments = [] # segments waiting to be added |
| 110 | 21 self.segment_group = Group() |
| 178 | 22 self.segment_group.add(*reversed(self.segments)) |
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23 self.orientation = orientation |
| 178 | 24 self.speed = 120.0 # pixel / s |
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25 self.frac_ds = 0.0 |
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26 self.mutation = None |
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27 self.coiled = True |
| 78 | 28 |
| 110 | 29 head = property(fget=lambda self: self.segments[0]) |
| 30 tail = property(fget=lambda self: self.segments[-1]) | |
| 31 | |
| 32 def create_segments(self, tile_pos, orientation): | |
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33 tx, ty = tile_pos |
| 110 | 34 dx, dy = orientation |
| 178 | 35 segments = [] |
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36 for cls in [Head] + [Body] * INITIAL_SEGMENT_COUNT + [Tail]: |
| 178 | 37 segments.append(cls((tx, ty))) |
| 38 return segments | |
| 110 | 39 |
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40 def add_segment(self, segment=None): |
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41 if segment is None: |
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42 segment = Body((0, 0)) |
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43 segment.set_colour(self.head.colour) |
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44 self.pending_segments.append(segment) |
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45 |
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46 def remove_segment(self, segment=None): |
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47 if segment is None: |
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48 if len(self.segments) < 3: |
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49 return |
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50 segment = self.segments[-2] |
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51 try: |
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52 idx = self.segments.index(segment) |
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53 except IndexError: |
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54 return |
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55 self.shiftup_segments(idx, segment.get_tile_state()) |
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56 del self.segments[idx] |
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57 segment.kill() |
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58 |
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59 def shiftup_segments(self, idx, state): |
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60 for segment in self.segments[idx:]: |
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61 next_state = segment.get_tile_state() |
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62 segment.shift_tile(state) |
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63 state = next_state |
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64 |
| 110 | 65 def draw(self, surface): |
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66 self.segment_group.draw(surface) |
| 98 | 67 |
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68 def update(self, dt, world): |
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69 ds = dt * self.speed + self.frac_ds |
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70 ds, self.frac_ds = divmod(ds, 1) |
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71 ds = int(ds) |
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72 while True: |
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73 tile_state = self.head.get_tile_state() |
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74 shifted, ds = self.head.shift_head(ds) |
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75 if shifted: |
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76 self.coiled = False |
| 221 | 77 self.head.shifted_tile() |
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78 self.head.set_orientation(self.orientation) |
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79 else: |
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80 break |
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81 if self.pending_segments: |
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82 new_segment = self.pending_segments.pop(0) |
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83 self.segments.insert(1, new_segment) |
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84 self.segment_group.add(new_segment) |
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85 new_segment.shift_tile(tile_state) |
| 206 | 86 for segment in self.segments[2:]: |
| 87 segment.shift_tile(segment.get_tile_state()) | |
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88 else: |
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89 self.shiftup_segments(1, tile_state) |
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90 |
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91 self.check_self_crash() |
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92 for segment in self.segments: |
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93 segment.shift_pixels(ds) |
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94 world.interact(segment) |
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95 |
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96 def set_orientation(self, orientation): |
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97 # Don't allow the snake to go back on itself |
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98 # immediately. More creative self-inflicted |
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99 # deaths are allowed though. |
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100 if (abs(self.head.orientation[0] - orientation[0]) < 2 |
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101 and abs(self.head.orientation[1] - orientation[1]) < 2): |
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102 self.orientation = orientation |
| 98 | 103 |
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104 def check_self_crash(self): |
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105 if self.coiled: |
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106 return |
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107 collides = spritecollide(self.head, self.segment_group, False) |
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108 if [s for s in collides if s not in self.segments[:2]]: |
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109 self.crash() |
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110 |
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111 def crash(self): |
| 186 | 112 SnakeDiedEvent.post() |
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113 |
| 213 | 114 def exit_level(self): |
| 115 LevelCompletedEvent.post() | |
| 116 | |
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117 def mutate(self, mutation): |
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118 self.mutation = mutation |
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119 self.tail.show_mutation(mutation) |
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120 |
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121 def can_swim(self): |
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122 return self.mutation == 'amphibious' |
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123 |
| 255 | 124 def flame_retardant(self): |
| 125 return self.mutation == 'flame-retardant' | |
| 126 | |
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127 def adjust_speed(self, delta): |
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128 self.speed += delta |
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129 self.speed = max(self.speed, 60) |
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130 self.speed = min(self.speed, 180) |
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131 |
| 98 | 132 |
| 110 | 133 class Segment(BaseSprite): |
| 134 | |
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135 GREEN = mutators.SNAKE_GREEN |
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136 BLUE = mutators.BLUE |
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137 RED = mutators.RED |
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138 YELLOW = mutators.YELLOW |
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139 |
| 131 | 140 _detail_mutators = () |
| 141 | |
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142 is_head = False |
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143 |
| 110 | 144 def __init__(self, image_name, tile_pos): |
| 145 super(Segment, self).__init__() | |
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146 self.set_base_image(image_name) |
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147 self.colour = self.GREEN |
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148 self.orientation = UP |
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149 |
| 131 | 150 self.make_images() |
|
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151 self.update_image() |
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152 self.set_tile_pos(tile_pos) |
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188
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153 self.on_tiles = [] |
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154 |
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155 def filter_collisions(self, group): |
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156 collide = [] |
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157 tiles = spritecollide(self, group, False) |
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158 for tile in tiles: |
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159 if tile not in self.on_tiles: |
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160 collide.append(tile) |
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161 self.on_tiles = tiles |
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162 return collide |
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163 |
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153
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164 def set_base_image(self, image_name): |
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165 self._base_image = "/".join(["snake", image_name]) |
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166 |
| 131 | 167 def make_images(self): |
| 110 | 168 self._images = {} |
| 169 for orientation, muts in [ | |
|
199
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170 (RIGHT, (mutators.RIGHT,)), |
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171 (LEFT, (mutators.LEFT,)), |
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172 (UP, (mutators.UP,)), |
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173 (DOWN, (mutators.DOWN,)), |
| 110 | 174 ]: |
|
205
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175 all_muts = (self.colour,) + self._detail_mutators + muts |
| 141 | 176 self._images[orientation] = self.load_image(self._base_image, |
| 177 all_muts) | |
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178 |
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179 def update_image(self): |
|
177
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180 self.image = self._images[self.orientation] |
| 110 | 181 |
| 182 def set_orientation(self, orientation): | |
|
177
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183 self.orientation = orientation |
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184 self.update_image() |
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185 |
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186 def set_colour(self, colour_overlay): |
|
205
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187 self.colour = colour_overlay |
| 131 | 188 self.make_images() |
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189 self.update_image() |
| 110 | 190 |
|
177
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191 def get_tile_state(self): |
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192 return self.tile_pos, self.orientation |
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193 |
|
252
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194 def get_distance(self): |
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195 rx, ry = self.rect.topleft |
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196 x, y = tile_sizify(self.tile_pos) |
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197 return max(abs(rx - x), abs(ry - y)) |
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198 |
|
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199 def shift_tile(self, tile_state): |
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200 """Shift this segment to the tile the other one was on. |
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201 |
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202 Also reset the position to be the center of the tile. |
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203 """ |
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204 tile_pos, orientation = tile_state |
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205 self.set_tile_pos(tile_pos) |
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206 self.orientation = orientation |
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207 |
|
252
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208 def shift_tile_and_pixels(self, tile_state): |
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209 ds = self.get_distance() |
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210 self.shift_tile(tile_state) |
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211 self.shift_pixels(ds) |
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212 |
| 221 | 213 def shifted_tile(self): |
| 214 pass | |
| 215 | |
|
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216 def shift_pixels(self, distance): |
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217 """Shift this segment a number of pixels.""" |
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218 dx, dy = self.orientation |
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219 dx, dy = distance * dx, distance * dy |
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220 self.rect = self.rect.move(dx, dy) |
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221 |
|
223
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222 def shift_head(self, ds): |
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223 """Shift the head a number of pixels in the direction of it |
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224 orientation. |
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225 """ |
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226 dx, dy = self.orientation |
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227 TX, TY = TILE_SIZE |
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228 rx, ry = self.rect.left, self.rect.top |
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229 tx, ty = self.tile_pos |
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230 # WARNING: Tri-state logic ahead |
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231 # (Tri-state logic is the mamba's natural habitat) |
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232 if dx != 0: |
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233 newdx = rx + ds * dx |
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234 newtx = newdx / TX |
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235 if newtx > tx: |
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236 self.set_tile_pos((tx + 1, ty)) |
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237 ds = newdx - self.rect.left |
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238 return True, ds |
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239 elif newtx < tx - 1: |
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240 self.set_tile_pos((tx - 1, ty)) |
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241 ds = self.rect.left - newdx |
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242 return True, ds |
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243 else: |
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244 newdy = ry + ds * dy |
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245 newty = newdy / TY |
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246 if newty > ty: |
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247 self.set_tile_pos((tx, ty + 1)) |
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248 ds = newdy - self.rect.top |
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249 return True, ds |
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250 elif newty < ty - 1: |
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251 self.set_tile_pos((tx, ty - 1)) |
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252 ds = self.rect.top - newdy |
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253 return True, ds |
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254 return False, ds |
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255 |
| 110 | 256 |
| 257 class Head(Segment): | |
|
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258 CLOSED = "snake-head" |
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259 OPEN = "snake-head-mouth-open-r" |
|
212
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260 EYE = mutators.Overlay("snake/snake-head-eye-r") |
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261 TONGUE = mutators.Overlay("snake/snake-head-tongue-r") |
|
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262 |
|
182
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Painted Jezebel! (Assuming you name your snake Jezebel.)
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263 is_head = True |
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264 |
| 110 | 265 def __init__(self, tile_pos): |
|
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266 self._detail_mutators = (self.EYE,) |
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267 super(Head, self).__init__(self.CLOSED, tile_pos) |
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268 |
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269 def mouth_open(self): |
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270 self.set_base_image(self.OPEN) |
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271 self.make_images() |
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272 self.update_image() |
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273 |
|
218
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Open mouth when eating things
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|
274 def mouth_close(self): |
|
153
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275 self.set_base_image(self.CLOSED) |
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276 self.make_images() |
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277 self.update_image() |
| 110 | 278 |
| 131 | 279 def tongue_out(self): |
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280 self._detail_mutators = (self.EYE, self.TONGUE) |
| 131 | 281 self.make_images() |
| 282 self.update_image() | |
| 283 | |
| 284 def tongue_in(self): | |
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285 self._detail_mutators = (self.EYE,) |
| 131 | 286 self.make_images() |
| 287 self.update_image() | |
| 288 | |
| 221 | 289 def shifted_tile(self): |
| 290 if random.random() < 0.02: | |
| 291 self.mouth_open() | |
| 292 self.tongue_out() | |
| 293 else: | |
| 294 self.mouth_close() | |
| 295 self.tongue_in() | |
| 296 | |
| 110 | 297 |
| 298 class Body(Segment): | |
| 299 def __init__(self, tile_pos): | |
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300 super(Body, self).__init__("snake-body", tile_pos) |
| 110 | 301 |
| 302 | |
| 303 class Tail(Segment): | |
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261
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304 INDICATORS = { |
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262
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305 "flame-retardant": mutators.Overlay("snake/snake-tail-fire-r"), |
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306 "amphibious": mutators.Overlay("snake/snake-tail-puddle-r"), |
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307 } |
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308 |
| 110 | 309 def __init__(self, tile_pos): |
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310 super(Tail, self).__init__("snake-tail-r", tile_pos) |
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311 |
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312 def show_mutation(self, mutation): |
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313 self._detail_mutators = (self.INDICATORS[mutation],) |
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314 self.make_images() |
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315 self.update_image() |