#Python Turtle 绘图入门到进阶

from turtle import *

# 初始化画布和画笔配置
setup(600, 400)  # 弹出宽600px、高400px的窗口
width(4)         # 画笔线条粗细设为4
speed(3)         # 绘制速度调为3（适中）

# 逐边绘制彩色长方形
pencolor('red')   # 第一条边：红色
forward(200)      # 小海龟前进200像素
right(90)         # 原地向右转90度

pencolor('green') # 第二条边：绿色
forward(100)
right(90)

pencolor('blue')  # 第三条边：蓝色
forward(200)
right(90)

pencolor('black') # 第四条边：黑色
forward(100)

done()  # 绘制完成后保持窗口不关闭

from turtle import *

def draw_star(x, y, size=40):
    """在(x,y)坐标处画指定大小的五角星"""
    penup()
    goto(x, y)
    pendown()
    
    setheading(0)  # 先把小海龟朝向右边
    for _ in range(5):
        forward(size)
        right(144)  # 五角星外角度数固定144°

# 画从左到右的9个五角星（间距50px）
title("一排小五角星")
for x_pos in range(-200, 250, 50):
    draw_star(x_pos, 0, size=30)

done()

from turtle import *
import random

# 初始化配置（先运行配置再画图）
colormode(255)  # 切换到RGB颜色模式（0-255）
speed(0)        # 最快绘制速度
left(90)        # 小海龟初始朝上
penup()
goto(0, -180)   # 把树干底部移到画布下方
pendown()

# 分形树核心参数
TREE_LEVELS = 10    # 递归深度（越深越密，别超过15）
BRANCH_LENGTH = 80  # 初始树干长度
BRANCH_ANGLE = 25   # 左右分支的基础夹角

def draw_branch(length, level):
    """递归绘制树枝的函数"""
    if level > TREE_LEVELS:
        return
    
    # 树枝宽度和颜色随深度变化：越往上越细越浅
    width(TREE_LEVELS - level + 1)
    green_level = 255 // TREE_LEVELS * level
    pencolor(0, green_level, 0)
    
    forward(length)
    
    # 先画右分支，再画左分支，最后退回去
    right(BRANCH_ANGLE + random.randint(-5, 5))  # 加随机角度让树更自然
    draw_branch(length * 0.75, level + 1)
    
    left(BRANCH_ANGLE * 2 + random.randint(-5, 5))
    draw_branch(length * 0.75, level + 1)
    
    right(BRANCH_ANGLE + random.randint(-5, 5))
    backward(length)

# 开始绘制
title("带随机感的渐变分形树")
draw_branch(BRANCH_LENGTH, 1)
hideturtle()  # 画完把小海龟藏起来更美观

done()

from turtle import Turtle, Screen

def main():
    # 1. 创建独立的画布和海龟对象
    screen = Screen()
    screen.setup(800, 600)
    screen.title("OO风格彩色螺旋")
    screen.bgcolor("#f0f8ff")  # 淡蓝色背景
    
    spiral_turtle = Turtle()
    spiral_turtle.shape("turtle")  # 把画笔图标换成可爱的小海龟
    spiral_turtle.color("purple")
    spiral_turtle.speed(0)
    spiral_turtle.pensize(2)
    
    # 2. 绘制彩色螺旋（颜色循环+角度微调制造缠绕感）
    colors = ['#ff4757', '#ffa502', '#2ed573', '#1e90ff', '#a55eea', '#ff6b81']
    for i in range(120):
        spiral_turtle.color(colors[i % 6])
        spiral_turtle.forward(i * 3)
        spiral_turtle.right(92)  # 比90°多2°，螺旋不会重叠
    
    spiral_turtle.hideturtle()
    screen.mainloop()

if __name__ == "__main__":
    main()

from turtle import Turtle, Screen

def move_forward():
    artist.forward(15)

def move_backward():
    artist.backward(15)

def turn_left():
    artist.left(20)

def turn_right():
    artist.right(20)

def clear_canvas():
    artist.clear()
    artist.penup()
    artist.home()
    artist.pendown()

def toggle_pen():
    if artist.isdown():
        artist.penup()
    else:
        artist.pendown()

# 初始化画布和海龟
screen = Screen()
screen.title("键盘控制的小画板")
screen.setup(700, 500)

artist = Turtle()
artist.shape("turtle")
artist.color("darkgreen")
artist.speed(5)

# 绑定按键与对应函数
screen.onkey(move_forward, "Up")
screen.onkey(move_backward, "Down")
screen.onkey(turn_left, "Left")
screen.onkey(turn_right, "Right")
screen.onkey(clear_canvas, "c")
screen.onkey(toggle_pen, "space")

screen.listen()  # 关键一步：让画布开始监听键盘输入
screen.mainloop()