吴裕雄--天生自然python编程：turtle模块绘图（4）

import turtle
 
bob = turtle.Turtle()
 
for i in range(1,5):
    bob.fd(100)
    bob.lt(90)
    
turtle.mainloop()

import turtle
import math
 
def circle(t,r,a):
    #传入接口arc，在arc中完成大部分计算
    arc(t,r,a)
    
def arc(t,r,a):
    #计算边的长度，同时设定边的个数
    length = 2 * math.pi * r * abs(a) / 360
    n = int(length / 4) + 3
    step_length = length / n
    step_angle = a / n
    polygon(t, step_length, n)

def polygon(t, length, n):
    #画出图形
    for i in range(n):
        t.fd(length)
        t.lt(360/n)
        
bob = turtle.Turtle()
radius = 50
angle = 360
circle(bob, radius, angle)

turtle.mainloop()

import turtle
 
def draw_spiral(t, n, length=3, a=0.1, b=0.0002):
    #Draws an Archimedian spiral starting at the origin
    theta = 0.0
    for i in range(n):
        t.fd(length)
        dtheta = 1 / (a + b * theta)
        t.lt(dtheta)
        theta += dtheta

#create the world and bob
bob = turtle.Turtle()
draw_spiral(bob, n=1000)
 
turtle.mainloop()

import turtle

def draw_diamond(turt):
    for i in range(1,3):   
        turt.forward(100)
        turt.right(45)
        turt.forward(100)
        turt.right(135)
        
def draw_art():
    window = turtle.Screen() #视窗
    window.bgcolor("black") #背景颜色
    brad = turtle.Turtle()  #创建一个“乌龟”对象
    brad.shape("turtle")    #设定画笔图像是乌龟
    brad.color("red")       #设定画笔颜色是红色
    brad.speed("fast")      #画画速度是快
    for i in range(1, 37):  #调用diamond函数36次，即画36个花瓣
        draw_diamond(brad)
        brad.right(10)
    brad.right(90)          #画出枝干
    brad.forward(1000)
    window.exitonclick()
draw_art()

import math
import turtle

def polyline(t, n, length, angle):
    #Draws n line segments
    for i in range(n):
        t.fd(length)
        t.lt(angle)
        
def arc(t, r, angle):
    #Draws an arc with given radius and angle
    arc_length = 2 * math.pi * r * abs(angle) / 360
    n = int(arc_length / 4) + 3
    step_length = arc_length / n
    step_angle = float(angle) / n
    t.lt(step_angle/2)
    polyline(t, n, step_length, step_angle)
    t.rt(step_angle/2)

def petal(t, r, angle):
    #Draws a petal using two arcs.
    for i in range(2):
        arc(t, r, angle)
        t.lt(180 - angle)
        
def flower(t, n, r, angle):
    #Draws a flower with n petals
    for i in range(n):
        petal(t, r, angle)
        t.lt(360.0/n)
        
def move(t, length):
    #Move turtle(t) forwoard (length) units without leaving a trail
#     t.pu()
    t.fd(length)
    t.pd()
    
bob = turtle.Turtle()
#draw a sequence of three flowers
 
move(bob, -100)
flower(bob, 7, 60.0, 60.0)
 
move(bob, 100)
flower(bob, 10, 40.0, 80.0)
 
move(bob, 100)
flower(bob, 20, 140.0, 20.0)
 
bob.hideturtle()
turtle.mainloop()

import turtle

t = turtle.Pen()
turtle.bgcolor("black")
#sides = eval(str(input("输入要绘制的边的数目，请输入2-6Dev数字！ ")))
sides = 6
colors = ["red","yellow","green","blue","orange","purple"]
for x in range(360):
    t.pencolor(colors[x%sides]) #随机颜色
    t.speed("fast")
    t.forward(x*3/sides+x)    #六边形长度依次增加
    t.left(360/sides+1)       #转动角度依次变化
    t.width(x*sides/180)      
    t.left(91)
    
print ("结束")

import turtle  
from datetime import *

# 抬起画笔，向前运动一段距离放下  
def Skip(step):  
    turtle.penup()  
    turtle.forward(step)  
    turtle.pendown()
    
def mkHand(name, length):  
    # 注册Turtle形状，建立表针Turtle  
    turtle.reset()  
    Skip(-length * 0.1)  
    # 开始记录多边形的顶点。当前的乌龟位置是多边形的第一个顶点。  
    turtle.begin_poly()  
    turtle.forward(length * 1.1)  
    # 停止记录多边形的顶点。当前的乌龟位置是多边形的最后一个顶点。将与第一个顶点相连。  
    turtle.end_poly()  
    # 返回最后记录的多边形。  
    handForm = turtle.get_poly()  
    turtle.register_shape(name, handForm)
    
def Init():  
    global secHand, minHand, hurHand, printer  
    # 重置Turtle指向北  
    turtle.mode("logo")  
    # 建立三个表针Turtle并初始化  
    mkHand("secHand", 135)  
    mkHand("minHand", 125)  
    mkHand("hurHand", 90)  
    secHand = turtle.Turtle()  
    secHand.shape("secHand")  
    minHand = turtle.Turtle()  
    minHand.shape("minHand")  
    hurHand = turtle.Turtle()  
    hurHand.shape("hurHand")  
    
    for hand in secHand, minHand, hurHand:  
        hand.shapesize(1, 1, 3)  
        hand.speed(0)  
        
    # 建立输出文字Turtle  
    printer = turtle.Turtle()  
    # 隐藏画笔的turtle形状  
    printer.hideturtle()  
    printer.penup()

def SetupClock(radius):  
    # 建立表的外框  
    turtle.reset()  
    turtle.pensize(7)  
    for i in range(60):  
        Skip(radius)  
        if i % 5 == 0:  
            turtle.forward(20)  
            Skip(-radius - 20)  
             
            Skip(radius + 20)  
            if i == 0:  
                turtle.write(int(12), align="center", font=("Courier", 14, "bold"))  
            elif i == 30:  
                Skip(25)  
                turtle.write(int(i/5), align="center", font=("Courier", 14, "bold"))  
                Skip(-25)  
            elif (i == 25 or i == 35):  
                Skip(20)  
                turtle.write(int(i/5), align="center", font=("Courier", 14, "bold"))  
                Skip(-20)  
            else:  
                turtle.write(int(i/5), align="center", font=("Courier", 14, "bold"))  
            Skip(-radius - 20)  
        else:  
            turtle.dot(5)  
            Skip(-radius)  
        turtle.right(6) 

def Week(t):     
    week = ["星期一", "星期二", "星期三",  "星期四", "星期五", "星期六", "星期日"]  
    return week[t.weekday()] 

def Date(t):  
    y = t.year  
    m = t.month  
    d = t.day  
    return "%s年%d月%d日" % (y, m, d)

def Tick():  
    # 绘制表针的动态显示  
    t = datetime.today()  
    second = t.second + t.microsecond * 0.000001  
    minute = t.minute + second / 60.0  
    hour = t.hour + minute / 60.0  
    secHand.setheading(6 * second)  
    minHand.setheading(6 * minute)  
    hurHand.setheading(30 * hour)  
      
    turtle.tracer(False)   
    printer.forward(65)  
    printer.write(Week(t), align="center", font=("Courier", 14, "bold"))  
    printer.back(130)  
    printer.write(Date(t), align="center", font=("Courier", 14, "bold"))  
    printer.home()  
    turtle.tracer(True)  
    # 100ms后继续调用tick  
    turtle.ontimer(Tick, 100) 
    
def main():  
    # 打开/关闭龟动画，并为更新图纸设置延迟。  
    turtle.tracer(False)  
    Init()  
    SetupClock(160)  
    turtle.tracer(True)  
    Tick()  
    turtle.mainloop()
    
if __name__ == "__main__":  
    main()