|
| 1 | +from turtle import Turtle |
| 2 | + |
| 3 | +STARTING_POSITION = [(0, 0), (-20, 0), (-40, 0)] |
| 4 | +MOVE_DISTANCE = 20 |
| 5 | +UP = 90 |
| 6 | +DOWN = 270 |
| 7 | +LEFT = 180 |
| 8 | +RIGHT = 0 |
| 9 | + |
| 10 | + |
| 11 | +class Snake: |
| 12 | + |
| 13 | + def __init__(self): |
| 14 | + self.segments = [] |
| 15 | + self.create_snake() |
| 16 | + self.head = self.segments[0] |
| 17 | + |
| 18 | + def create_snake(self): |
| 19 | + for position in STARTING_POSITION: |
| 20 | + self.add_seg(position) |
| 21 | + |
| 22 | + def add_seg(self, position): |
| 23 | + seg_new = Turtle("square") |
| 24 | + seg_new.color("white") |
| 25 | + seg_new.penup() |
| 26 | + seg_new.goto(position) |
| 27 | + self.segments.append(seg_new) |
| 28 | + |
| 29 | + def reset(self): |
| 30 | + for seg in self.segments: |
| 31 | + seg.goto(1000, 1000) |
| 32 | + self.segments.clear() |
| 33 | + self.create_snake() |
| 34 | + self.head = self.segments[0] |
| 35 | + |
| 36 | + def extend(self): |
| 37 | + self.add_seg(self.segments[-1].position()) |
| 38 | + |
| 39 | + def move(self): |
| 40 | + for seg_num in range(len(self.segments) - 1, 0, -1): |
| 41 | + new_x = self.segments[seg_num - 1].xcor() |
| 42 | + new_y = self.segments[seg_num - 1].ycor() |
| 43 | + self.segments[seg_num].goto(new_x, new_y) |
| 44 | + self.head.forward(MOVE_DISTANCE) |
| 45 | + |
| 46 | + def up(self): |
| 47 | + if self.head.heading() != DOWN: |
| 48 | + self.head.setheading(UP) |
| 49 | + pass |
| 50 | + |
| 51 | + def down(self): |
| 52 | + if self.head.heading() != UP: |
| 53 | + self.head.setheading(DOWN) |
| 54 | + pass |
| 55 | + |
| 56 | + def left(self): |
| 57 | + if self.head.heading() != RIGHT: |
| 58 | + self.head.setheading(LEFT) |
| 59 | + pass |
| 60 | + |
| 61 | + def right(self): |
| 62 | + if self.head.heading() != LEFT: |
| 63 | + self.head.setheading(RIGHT) |
| 64 | + pass |
0 commit comments