Python畫櫻花樹

python的turtle模組肯定很棒吧！這次，我們要利用turtle來完成乙個櫻花樹的繪製。我們要用def和for語句迴圈。

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工具：turtle、random

我用的是python 3.8.0b3 shell，開始寫**吧！

# 櫻花樹

import randomimport turtle
jess = turtle.turtle()jess.hideturtle()jess.left(90)jess.penup()jess.goto(0, -100)jess.pendown()
# 「畫樹」函式# 引數分別是樹枝長度、畫筆def tree(branchlen, t):    if (branchlen > 3):        if (8 <= branchlen and branchlen <= 12) :            if (random.randint(0, 2) == 0) :                jess.pencolor('snow')            else :                jess.pencolor('lightcoral')            jess.pensize((branchlen / 3))        elif (branchlen < 8) :            if (random.randint(0, 1) == 0) :                jess.pencolor('snow')            else :                jess.pencolor('lightcoral')            jess.pensize((branchlen / 2))        else :            jess.pencolor('sienna')            jess.pensize((branchlen / 10))        jess.forward(branchlen)        a = (1.5 * (random.random()))        jess.right((20 * a))        b = (1.5 * (random.random()))        # 在tree函式內部調自己，這種方式叫遞迴呼叫        # 遞迴可以大幅提公升程式設計效率        tree(branchlen - 10 * b, t)        jess.left((40 * a))        tree(branchlen - 10 * b, t)        jess.right((20 * a))        jess.penup()        jess.backward(branchlen)        jess.pendown()
# 繪製樹下花瓣，引數分別是畫板數、畫筆
def petal(m, t):    for i in range(m):        a = (200 - 400 * (random.random()))        b = (10 - 20 * (random.random()))        jess.penup()        jess.forward(b)        jess.left(90)        jess.forward(a)        jess.pendown()        jess.pencolor('lightcoral')        jess.circle(1)        jess.penup()        jess.backward(a)        jess.right(90)        jess.backward(b)
def main():    jess = turtle.turtle()    jess.hideturtle()    jess.speed(0)    jess.goto(0, 0)    jess.penup()    jess.backward(150)    jess.pendown()    jess.pencolor('sienna')    tree(60, jess)    petal(100, jess)    turtle.done()
main()

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