turtle.clear函数
时间: 2024-05-14 08:17:08 浏览: 19
turtle.clear()是一个Python中的Turtle Graphics模块中的函数,用于清除绘图窗口中的所有图形,使得窗口回到初始状态。当你需要重新开始绘制时,可以使用这个函数来清空窗口。同时,它还可以重置绘图窗口的背景颜色和当前画笔的颜色、粗细等参数。例如,以下代码会清空窗口,并将背景颜色设置为蓝色:
```python
import turtle
turtle.bgcolor("blue")
turtle.clear()
```
执行后,绘图窗口的背景颜色将变为蓝色,并且之前绘制的所有图形都被清除。
相关问题
turtel.clear和turtle.reset
turtel.clear和turtle.reset都是Python Turtle模块中的函数,用于清除绘图窗口中的图形。
turtle.clear()函数用于清除绘图窗口中的所有图形,但不会改变窗口的背景颜色或标题。如果需要保留窗口中的背景颜色和标题,但是想清除所有图形,可以使用该函数。
turtle.reset()函数用于清除绘图窗口中的所有图形,并且将窗口恢复为默认状态。这意味着窗口的背景颜色、标题、大小、位置、方向等都将被重置为默认值。如果想要重新开始绘制一个新的图形,可以使用该函数。
修改代码使图中的小圆绕大圆圈的圆心以200圈每秒的速度进行圆周运动:import turtle import math # Set up the turtle screen screen = turtle.Screen() screen.bgcolor("white") screen.title("Circle with Moving Black Dot") # Create the turtle for drawing the circle circle_turtle = turtle.Turtle() circle_turtle.speed(0) circle_turtle.hideturtle() circle_turtle.penup() circle_turtle.goto(0, -80) circle_turtle.pendown() circle_turtle.color("black") circle_turtle.circle(80, 2880) # Create the turtle for drawing the black dot dot_turtle = turtle.Turtle() dot_turtle.speed(0) dot_turtle.hideturtle() dot_turtle.penup() dot_turtle.goto(40, 0) dot_turtle.pendown() dot_turtle.color("black") dot_turtle.begin_fill() dot_turtle.circle(4) dot_turtle.end_fill() # Calculate the angle increment for each frame of animation angle_increment = 1 / 60 # 200 degrees per second, 60 frames per second # Animate the movement of the black dot while True: dot_turtle.clear() angle = dot_turtle.heading() + angle_increment x = 40 * math.cos(math.radians(angle)) y = 40 * math.sin(math.radians(angle)) dot_turtle.goto(x, y) dot_turtle.begin_fill() dot_turtle.circle(6) # 小圆 dot_turtle.end_fill()
可以使用Python的time模块来控制圆周运动的速度,修改代码如下:
```python
import turtle
import math
import time
# Set up the turtle screen
screen = turtle.Screen()
screen.bgcolor("white")
screen.title("Circle with Moving Black Dot")
# Create the turtle for drawing the circle
circle_turtle = turtle.Turtle()
circle_turtle.speed(0)
circle_turtle.hideturtle()
circle_turtle.penup()
circle_turtle.goto(0, -80)
circle_turtle.pendown()
circle_turtle.color("black")
circle_turtle.circle(80, 2880)
# Create the turtle for drawing the black dot
dot_turtle = turtle.Turtle()
dot_turtle.speed(0)
dot_turtle.hideturtle()
dot_turtle.penup()
dot_turtle.goto(40, 0)
dot_turtle.pendown()
dot_turtle.color("black")
dot_turtle.begin_fill()
dot_turtle.circle(4)
dot_turtle.end_fill()
# Calculate the angle increment for each frame of animation
angle_increment = 200 / 60 # 200 degrees per second, 60 frames per second
# Animate the movement of the black dot
while True:
dot_turtle.clear()
angle = dot_turtle.heading() + angle_increment
x = 80 * math.cos(math.radians(angle))
y = 80 * math.sin(math.radians(angle))
dot_turtle.goto(x, y)
dot_turtle.begin_fill()
dot_turtle.circle(6) # 小圆
dot_turtle.end_fill()
time.sleep(1/60) # 控制运动速度
```
在上面的代码中,我们使用了time.sleep()函数来控制小圆的运动速度,将每帧的时间间隔设置为1/60秒。这样,小圆每秒绕大圆圈转200圈,同时每秒刷新60次界面,就可以实现流畅的圆周运动。