|
| 1 | +from turtle import Turtle |
| 2 | + |
| 3 | +def line(t): |
| 4 | + t.backward(100) |
| 5 | + |
| 6 | +def drawSpiral(myTurtle, lineLen): |
| 7 | + if lineLen < 500: |
| 8 | + myTurtle.forward(lineLen) |
| 9 | + myTurtle.right(90) |
| 10 | + drawSpiral(myTurtle, lineLen+20) |
| 11 | + |
| 12 | +def fractalTree1(branchLen, t): |
| 13 | + t.forward(branchLen) |
| 14 | + if branchLen > 5: |
| 15 | + t.right(20) |
| 16 | + fractalTree1(branchLen - 15, t) |
| 17 | + t.left(20) |
| 18 | + t.backward(branchLen) |
| 19 | + if branchLen > 5: |
| 20 | + t.left(20) |
| 21 | + fractalTree1(branchLen - 15, t) |
| 22 | + t.right(20) |
| 23 | + # t.backward(branchLen) |
| 24 | +def fractalTree2(branchLen, t): |
| 25 | + t.forward(branchLen) |
| 26 | + if branchLen > 5: |
| 27 | + t.right(20) |
| 28 | + fractalTree2(branchLen - 15, t) |
| 29 | + t.left(20) |
| 30 | + t.backward(branchLen) |
| 31 | + if branchLen > 5: |
| 32 | + t.left(20) |
| 33 | + fractalTree2(branchLen - 15, t) |
| 34 | + t.right(20) |
| 35 | + |
| 36 | +def tree2(branchLen, t): |
| 37 | + t.forward(branchLen) |
| 38 | + if branchLen > 5: |
| 39 | + t.right(20) |
| 40 | + tree2(branchLen - 15, t) |
| 41 | + t.left(20) |
| 42 | + t.backward(branchLen) |
| 43 | + if branchLen > 5: |
| 44 | + t.left(20) |
| 45 | + tree2(branchLen - 15, t) |
| 46 | + t.right(20) |
| 47 | + |
| 48 | +def fractalTree(branchLen, t): |
| 49 | + if branchLen > 0: |
| 50 | + t.forward(branchLen) |
| 51 | + t.right(20) |
| 52 | + fractalTree(branchLen - 15, t) |
| 53 | + t.left(40) |
| 54 | + fractalTree(branchLen - 15, t) |
| 55 | + t.right(20) |
| 56 | + t.backward(branchLen) |
| 57 | + |
| 58 | +if __name__ == '__main__': |
| 59 | + t = Turtle() # 创建画布实例 |
| 60 | + t.screen.delay(0) # 设置绘制显示延迟,以便观察过程 |
| 61 | + |
| 62 | + # 初始化画笔 |
| 63 | + t.pensize(2) # 设置画笔粗细为 2 个像素 |
| 64 | + t.color('green') # 设置画笔颜色为 绿色 |
| 65 | + t.left(90) # 向左旋转 90 度,即让画笔朝上 |
| 66 | + t.up() # 抬起画笔,即在移动时不会绘制 |
| 67 | + t.backward(300) # 相对画笔朝向,向后退 300 个像素 |
| 68 | + t.down() # 落下画笔,准备绘制 |
| 69 | + |
| 70 | + fractalTree2(130, t) # 绘制分形树,根树干长度为 105 像素 |
| 71 | + |
| 72 | + # 获取画布窗口,并设置关闭条件为点击窗口,以便在执行完成后保留绘图窗口 |
| 73 | + t.getscreen().exitonclick() |
| 74 | + |
| 75 | + |
0 commit comments